ORCID Profile
0000-0002-3857-1031
Current Organisation
Queensland University of Technology
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Materials Engineering | Nanoscale Characterisation | Functional Materials | Biomaterials | Compound Semiconductors | Nanotechnology | Mechanical Engineering | Metals and Alloy Materials | Ceramics | Composite and Hybrid Materials | Nanomaterials | Numerical Modelling and Mechanical Characterisation | Materials engineering | Catalytic Process Engineering | Condensed Matter Physics | Colloid And Surface Chemistry | Polymerisation Mechanisms | Chemical Characterisation of Materials | Materials Engineering not elsewhere classified | Polymers and plastics | Composite and hybrid materials | Environmental Engineering not elsewhere classified | Environmental Monitoring | Condensed Matter Physics—Electronic And Magnetic Properties; | Physical properties of materials | Interdisciplinary Engineering not elsewhere classified | Physical Chemistry (Incl. Structural) | Environmental Engineering | Inorganic Geochemistry | Nanotechnology not elsewhere classified | Cellular Interactions (incl. Adhesion, Matrix, Cell Wall) | Chemical Engineering not elsewhere classified | Crop and Pasture Improvement (Selection and Breeding) | Materials Engineering Not Elsewhere Classified | Surfaces and Structural Properties of Condensed Matter | Quantum Information, Computation and Communication | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Nanobiotechnology | Cell Development, Proliferation and Death | Nanoelectronics | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Technology | Expanding Knowledge in Engineering | Solar-photoelectric | Structural Metal Products | Health not elsewhere classified | Expanding Knowledge in the Physical Sciences | Scientific Instruments | Renewable Energy not elsewhere classified | Energy Storage (excl. Hydrogen) | Environmentally Sustainable Energy Activities not elsewhere classified | Metal Castings | Ceramics | Instrumentation not elsewhere classified | Integrated circuits and devices | Scientific instrumentation | Hydrogen Production from Renewable Energy | Mineral Resources (excl. Energy Resources) not elsewhere classified | Solar-Photovoltaic Energy | Air Quality not elsewhere classified | Energy not elsewhere classified | Environmental Health |
Related Links
Publications
High quality epitaxial graphene on 4H-SiC by face-to-face growth in ultra-high vacuum
Publisher: IOP Publishing
Date: 23-12-2023
Abstract: Epitaxial graphene on SiC is the most promising substrate for the next generation 2D electronics, due to the possibility to fabricate 2D heterostructures directly on it, opening the door to the use of all technological processes developed for silicon electronics. To obtain a suitable material for large scale applications, it is essential to achieve perfect control of size, quality, growth rate and thickness. Here we show that this control on epitaxial graphene can be achieved by exploiting the face-to-face annealing of SiC in ultra-high vacuum. With this method, Si atoms trapped in the narrow space between two SiC wafers at high temperatures contribute to the reduction of the Si sublimation rate, allowing to achieve smooth and virtually defect free single graphene layers. We analyse the products obtained on both on-axis and off-axis 4H-SiC substrates in a wide range of temperatures (1300 °C–1500 °C), determining the growth law with the help of x-ray photoelectron spectroscopy (XPS). Our epitaxial graphene on SiC has terrace widths up to 10 μ m (on-axis) and 500 nm (off-axis) as demonstrated by atomic force microscopy and scanning tunnelling microscopy, while XPS and Raman spectroscopy confirm high purity and crystalline quality.
Palladium clusters on graphite: Evidence of resonant hybrid states in the valence and conduction bands
Publisher: American Physical Society (APS)
Date: 15-03-1990
Paper-Like Writable Nanoparticle Network Sheets for Mask-Less MOF Patterning
Publisher: Wiley
Date: 03-10-2021
Abstract: Geometrical structuring of monolithic metal‐organic frameworks (MOFs) components is required for their practical implementation in many areas, including electronic devices, gas storage/separation, catalysis, energy storage as well as bio‐medical applications. Despite progress in structuring MOFs, an approach for the precise patterning of MOF functional geometries in the millimeter‐ to micro‐meter depth is lacking. Here, a facile and flexible concept for the microfabrication of complex MOF patterns on large surfaces is reported. The method relies on the engineering of easily‐writable sheets of precursor metal oxide nanoparticles. The gas‐phase conversion of these patterned ceramic nanoparticle sheets results in monolithic MOF objects with arbitrarily shaped geometries and thicknesses of up to hundreds of micrometers. The writing of complex patterns of zeolitic imidazolate framework‐8 (ZIF‐8) is demonstrated by a variety of approaches including ion beam, laser, and hand writing. Nanometer‐scale patterns are achieved by focused ion beam (FIB). Artless handwritings are obtained by using a pen in a similar fashion to writing on a paper. The pure ZIF‐8 composition of the resulting patterns is confirmed by a series of physical and chemical characterization. This facile MOF precursor‐writing approach provides novel opportunities for the design of MOF‐based devices with applications ranging from micro‐fluidics to renewable energy systems.
Hydrogen gas sensors based on thermally evaporated nanostructured MoO 3 Schottky diode: A comparative study
Publisher: IEEE
Date: 10-2011
Molecular-resolved imaging of conductive polymer self-organization at single-walled carbon nanotube interfaces
Publisher: SPIE
Date: 31-08-2006
DOI: 10.1117/12.680116
100% internal quantum efficiency in polychiral single-walled carbon nanotube bulk heterojunction/silicon solar cells
Publisher: Elsevier BV
Date: 04-2017
Self-ordering of Ge islands on step-bunched Si(111) surfaces
Publisher: AIP Publishing
Date: 03-11-2003
DOI: 10.1063/1.1626260
Abstract: By using step-bunched Si(111) surfaces as templates, we demonstrate the self-assembly of an ordered distribution of Ge islands without lithographic patterning. Initially, islands nucleate and evolve at step edges, up to complete ripening, forming long ribbons. Subsequently, island nucleation takes place at the center of flat terraces. Ge islands appear to be regularly spaced in scanning tunneling microscope images. The exploitation of this effect provides a possible route to grow ordered arrays of semiconducting nanostructures.
Highly Sensitive NO2 Gas Sensors Based on MoS2@MoO3 Magnetic Heterostructure
Publisher: MDPI AG
Date: 11-04-2022
DOI: 10.3390/NANO12081303
Abstract: Recently, two-dimensional (2D) materials and their heterostructures have attracted considerable attention in gas sensing applications. In this work, we synthesized 2D MoS2@MoO3 heterostructures through post-sulfurization of α-MoO3 nanoribbons grown via vapor phase transport (VPT) and demonstrated highly sensitive NO2 gas sensors based on the hybrid heterostructures. The morphological, structural, and compositional properties of the MoS2@MoO3 hybrids were studied by a combination of advanced characterization techniques revealing a core-shell structure with the coexistence of 2H-MoS2 multilayers and intermediate molybdenum oxysulfides on the surface of α-MoO3. The MoS2@MoO3 hybrids also exhibit room-temperature ferromagnetism, revealed by vibrating s le magnetometry (VSM), as a result of the sulfurization process. The MoS2@MoO3 gas sensors display a p-type-like response towards NO2 with a detection limit of 0.15 ppm at a working temperature of 125 °C, as well as superb selectivity and reversibility. This p-type-like sensing behavior is attributed to the heterointerface of MoS2-MoO3 where interfacial charge transfer leads to a p-type inversion layer in MoS2, and is enhanced by magnetic dipole interactions between the paramagnetic NO2 and the ferromagnetic sensing layer. Our study demonstrates the promising application of 2D molybdenum hybrid compounds in gas sensing applications with a unique combination of electronic and magnetic properties.
Synthesis and characterization of WS2/graphene/SiC van der Waals heterostructures via WO3−x thin film sulfurization
Publisher: Springer Science and Business Media LLC
Date: 15-10-2020
DOI: 10.1038/S41598-020-74024-W
Abstract: Van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs) and graphene have attracted keen scientific interest due to the complementary properties of the materials, which have wide reaching technological applications. Direct growth of uniform, large area TMDs on graphene substrates by chemical vapor deposition (CVD) is limited by slow lateral growth rates, which result in a tendency for non-uniform multilayer growth. In this work, monolayer and few-layer WS 2 was grown on epitaxial graphene on SiC by sulfurization of WO 3 − x thin films deposited directly onto the substrate. Using this method, WS 2 growth was achieved at temperatures as low as 700 °C – significantly less than the temperature required for conventional CVD. Achieving long-range uniformity remains a challenge, but this process could provide a route to synthesize a broad range of TMD/graphene van der Waals heterostructures with novel properties and functionality not accessible by conventional CVD growth.
Growth of Ge–Si(111) epitaxial layers: intermixing, strain relaxation and island formation
Publisher: Elsevier BV
Date: 05-1998
Enhanced amperometric acetone sensing using electrospun non-stoichiometric WO3-: X nanofibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0TC04922K
Abstract: We report on a highly sensitive erometric gas sensing device that employs electrospun tungsten oxide (WO 3−x ) nanofibers thus enabling trace levels (concentrations 1.2–12.5 ppm) of acetone vapor to be detected when operating at 350 °C.
Achieving commercial-level mass loading in ternary-doped holey graphene hydrogel electrodes for ultrahigh energy density supercapacitors
Publisher: Elsevier BV
Date: 04-2018
Temperature and electric field dependent mobility in poly(3-hexylthiophene) diodes
Publisher: AIP Publishing
Date: 07-2010
DOI: 10.1063/1.3460111
Abstract: Current-voltage (I-V) curves of poly(3-hexylthiophene) (P3HT) diodes have been collected to investigate the polymer hole-dominated charge transport. At room temperature and at low electric fields the I-V characteristic is purely Ohmic whereas at medium-high electric fields, experimental data shows that the hole transport is trap dominated in the space charge limited current (SCLC) regime. In this regime, it is possible to extract the I-V characteristic of the P3HT/Al junction showing the ideal Schottky diode behavior over five orders of magnitude. At high-applied electric fields, holes’ transport is found to be in the trap free SCLC regime. We have measured and modeled in this regime the holes’ mobility to evaluate its dependence from the electric field applied and the temperature of the device.
Self-assembly of Ge quantum dots on Silicon: An example of controlled nanomanufacturing
Publisher: Elsevier BV
Date: 07-2009
Optimization of Mo/Cr bilayer back contacts for thin-film solar cells
Publisher: Beilstein Institut
Date: 18-10-2018
DOI: 10.3762/BJNANO.9.252
Abstract: Molybdenum (Mo) is the most commonly used material as back contact in thin-film solar cells. Adhesion of Mo film to soda–lime glass (SLG) substrate is crucial to the performance of solar cells. In this study, an optimized bilayer structure made of a thin layer of Mo on an ultra-thin chromium (Cr) adhesion layer is used as the back contact for a copper zinc tin sulfide (CZTS) thin-film solar cell on a SLG substrate. DC magnetron sputtering is used for deposition of Mo and Cr films. The conductivity of Mo/Cr bilayer films, their microstructure and surface morphology are studied at different deposition powers and working pressures. Good adhesion to the SLG substrate has been achieved by means of an ultra-thin Cr layer under the Mo layer. By optimizing the deposition conditions we achieved low surface roughness, high optical reflectance and low sheet resistivity while we could decrease the back contact thickness to 600 nm. That is two thirds to half of the thickness that is currently being used for bilayer and single layer back contact for thin-film solar cells. We demonstrate the excellent properties of Mo/Cr bilayer as back contact of a CZTS solar cell.
EELPS investigation of YBa-2Cu3O7-δ thin films and sintered samples
Publisher: Elsevier BV
Date: 09-1991
Recent advances in fabrication and characterization of graphene-polymer nanocomposites
Publisher: Scientific Research Publishing, Inc.
Date: 2012
Ge dots self-assembling: Surfactant mediated growth of Ge on SiGe (118) stress-induced kinetic instabilities
Publisher: AIP Publishing
Date: 02-12-2003
DOI: 10.1063/1.1633012
Abstract: The ordering of islands on naturally or artificially nanostructured surfaces is one of the most recent objectives among actual nanotechnology challenges. We show in this letter that, by a combination of two approaches, i.e., a two-step molecular beam epitaxy (MBE) deposition process and surfactant-mediated growth, we are able to obtain chains of nicely ordered ultrasmall islands of lateral size below 50 nm. The two-step MBE process consists of vicinal Si(001) surface self-patterning by SiGe growth instability and Ge dot ordering by subsequent Ge deposition on a SiGe template layer. The surfactant-mediated growth consists of submonolayer Sb deposition prior to Ge growth, in order to reduce the island size up to 25 nm. The best ordering of Ge islands is obtained when the island size matches the wavelength of the template layer.
Bovine Serum Albumin Adhesion Force Measurements Using an Atomic Force Microscopy
Publisher: Trans Tech Publications, Ltd.
Date: 02-2008
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.32.49
Abstract: A new, direct method has been developed to measure the adhesion forces of bovine serum albumin (BSA) on surfaces by using Atomic Force Microscopy (AFM) in liquid environment. We were able to measure interactions between proteins and substrate surface in PBS solution directly without any modification to the substrate or the AFM tip. Two different surfaces have been used in the experiments: mica (hydrophilic surface) and polystyrene (hydrophobic surface). The results show that a polystyrene surface is more adhesive to BSA than a mica surface. This is consistent with previous research, which assessed that hydrophobic surfaces enhance protein adhesion but hydrophilic surfaces do not, demonstrating the effectiveness of the technique.
Simple Method for Estimating the Surface Area of Layered Graphene‐Based Thin Films
Publisher: Wiley
Date: 17-10-2019
Abstract: Thin films, papers, or foils produced from graphene-based materials have been the focus of considerable research interest in recent years. They have a range of applications including energy storage, selective filtration of liquids, and gas storage. For all of these applications, the critical attribute of the films is their pore volume. However, there remains a considerable challenge around characterizing the accessible microscopic surface area of the materials in their intended state of application. In this work, an image-processing-based approach is presented for estimating the lower threshold of specific surface area for graphene-based films that have a typical multilayered structure. Canny edge detection is used together with tortuosity measurements to infer sheet areas from layer edges. The method serves as a simple independent characterization technique. Specific surface area values predicted for a range of similar films vary by less than 4× the reported values, which vary by >1.1×10
Comparison between extended x-ray-absorption and extended electron energy-loss fine-structure results above the
Publisher:
American Physical Society (APS)
Date:
15-12-1985
Publisher: American Physical Society (APS)
Date: 15-12-1985
Nanostructures for sensors, electronics, energy and environment
Publisher: Beilstein Institut
Date: 02-05-2012
DOI: 10.3762/BJNANO.3.40
Beneficial defects: exploiting the intrinsic polishing-induced wafer roughness for the catalyst-free growth of Ge in-plane nanowires
Publisher: Springer Science and Business Media LLC
Date: 16-07-2014
Ultraviolet photodetection of flexible ZnO nanowire sheets in polydimethylsiloxane polymer
Publisher: Beilstein Institut
Date: 02-05-2012
DOI: 10.3762/BJNANO.3.41
Abstract: ZnO nanowires are normally exposed to an oxygen atmosphere to achieve high performance in UV photodetection. In this work we present results on a UV photodetector fabricated using a flexible ZnO nanowire sheet embedded in polydimethylsiloxane (PDMS), a gas-permeable polymer, showing reproducible UV photoresponse and enhanced photoconduction. PDMS coating results in a reduced response speed compared to that of a ZnO nanowire film in air. The rising speed is slightly reduced, while the decay time is prolonged by about a factor of four. We conclude that oxygen molecules diffusing in PDMS are responsible for the UV photoresponse.
Real-time scanning tunneling microscopy observation of the evolution of Ge quantum dots on nanopatterned Si(001) surfaces
Publisher: American Physical Society (APS)
Date: 26-05-2004
Functionalised zinc oxide nanowire gas sensors: Enhanced NO2 gas sensor response by chemical modification of nanowire surfaces
Publisher: Beilstein Institut
Date: 02-05-2012
DOI: 10.3762/BJNANO.3.43
Abstract: Surface coating with an organic self-assembled monolayer (SAM) can enhance surface reactions or the absorption of specific gases and hence improve the response of a metal oxide (MOx) sensor toward particular target gases in the environment. In this study the effect of an adsorbed organic layer on the dynamic response of zinc oxide nanowire gas sensors was investigated. The effect of ZnO surface functionalisation by two different organic molecules, tris(hydroxymethyl)aminomethane (THMA) and dodecanethiol (DT), was studied. The response towards ammonia, nitrous oxide and nitrogen dioxide was investigated for three sensor configurations, namely pure ZnO nanowires, organic-coated ZnO nanowires and ZnO nanowires covered with a sparse layer of organic-coated ZnO nanoparticles. Exposure of the nanowire sensors to the oxidising gas NO 2 produced a significant and reproducible response. ZnO and THMA-coated ZnO nanowire sensors both readily detected NO 2 down to a concentration in the very low ppm range. Notably, the THMA-coated nanowires consistently displayed a small, enhanced response to NO 2 compared to uncoated ZnO nanowire sensors. At the lower concentration levels tested, ZnO nanowire sensors that were coated with THMA-capped ZnO nanoparticles were found to exhibit the greatest enhanced response. Δ R / R was two times greater than that for the as-prepared ZnO nanowire sensors. It is proposed that the Δ R / R enhancement in this case originates from the changes induced in the depletion-layer width of the ZnO nanoparticles that bridge ZnO nanowires resulting from THMA ligand binding to the surface of the particle coating. The heightened response and selectivity to the NO 2 target are positive results arising from the coating of these ZnO nanowire sensors with organic-SAM-functionalised ZnO nanoparticles.
Model of the local structure of random ternary alloys: Experiment versus theory
Publisher: American Physical Society (APS)
Date: 15-06-1985
Early stage of Ge growth on Si(001) vicinal surfaces with an 8° miscut along[ 1
Publisher:
American Physical Society (APS)
Date:
09-01-2007
Publisher: American Physical Society (APS)
Date: 09-01-2007
Microscopic and Spectroscopic Investigation of Poly(3-hexylthiophene) Interaction with Carbon Nanotubes
Publisher: MDPI AG
Date: 29-08-2011
DOI: 10.3390/POLYM3031433
Topology and doping effects in three-dimensional nanoporous graphene
Publisher: Elsevier BV
Date: 05-2018
Two-Dimensional Hallmark of Highly Interconnected Three-Dimensional Nanoporous Graphene
Publisher: American Chemical Society (ACS)
Date: 18-07-2017
Transfer of CVD-grown graphene for room temperature gas sensors
Publisher: IOP Publishing
Date: 13-09-2017
Abstract: An easy transfer procedure to obtain graphene-based gas sensing devices operating at room temperature (RT) is presented. Starting from chemical vapor deposition-grown graphene on copper foil, we obtained single layer graphene which could be transferred onto arbitrary substrates. In particular, we placed single layer graphene on top of a SiO
Effect of relaxation of the second-nearest neighbors on the thermodynamic properties of semiconducting alloys: Application to<
Publisher: American Physical Society (APS)
Date: 15-03-1989
Sensing performance of reduced graphene oxide-Fe doped WO3 hybrids to NO2 and humidity at room temperature
Publisher: Elsevier BV
Date: 03-2018
Structural study of thin films by extended energyloss fine structure spectroscopy
Publisher: Elsevier BV
Date: 1990
Adsorption and Reactivity of Pyridine Dicarboxylic Acid on Cu(111)
Publisher: American Chemical Society (ACS)
Date: 31-07-2018
p-Channel, n-Channel and ambipolar field-effect transistors based on functionalized carbon nanotube networks
Publisher: Elsevier BV
Date: 07-2009
Enhancing Mechanical Energy Transfer of Piezoelectric Supercapacitors
Publisher: Wiley
Date: 23-09-2021
Abstract: The expected widespread use of wearable and other low‐power healthcare devices has triggered great interest in piezoelectric materials as a promising energy harvester. However, traditional piezoelectric materials suffer from poor interfacial energy transfer when used in self‐charging power cells. Herein, piezoelectric supercapacitors (PSCs) are engineered using MXene‐incorporated polymeric piezo separator and MXene (Ti 3 C 2 T x ) multilayered sheets as electrodes. The MXene‐blended polymer film showed considerable improvement with maximum output voltage of 28 V and current of 1.71 µA. The electromechanical properties studied by piezoelectric force microscopy suggest that the integration of MXene in polyvinylidene fluoride (PVDF) matrix induces the degree of dipole moment alignment, thereby improving the piezoelectric properties of PVDF. At the device level, the PSC featured the capacitance of 61 mF cm –2 , the energy density of 24.9 mJ cm −2 , the maximum power density of 1.3 mW cm −3 , and the excellent long‐term cycling stability. A way is paved toward green, integrated energy harvesting and storing technology for next‐generation self‐powered implantable and wearable electronics.
Graphene-based supercapacitor electrodes: Addressing challenges in mechanisms and materials
Publisher: Elsevier BV
Date: 06-2019
Role of patterning in islands nucleation on semiconductor surfaces
Publisher: Elsevier BV
Date: 11-2006
Random distribution and miscibility of Cd1−xZnxTe alloy from exafs
Publisher: Elsevier BV
Date: 07-1985
Moth-eye effect in hierarchical carbon nanotube anti-reflective coatings
Publisher: Elsevier BV
Date: 11-2016
A study of the pair distribution function of self-organized Ge quantum dots
Publisher: AIP Publishing
Date: 21-07-2008
DOI: 10.1063/1.2965122
Abstract: We explore the use of the pair distribution function to study the self-organization process of Ge quantum dots on both nanopatterned and nonpatterned oxidized Si(001) surfaces. Dots formation and ordering upon annealing of a Ge thin film are analyzed. The method we use is not limited to this case study. We show how it can be applied to determine short and long range self-ordering of nanostructures. We support our results by applying a software routine to simulate patterns of dots to finally spot the relevant physical aspects of Ge islands self-assembly.
Thermodynamic properties of ternary semiconducting alloys
Publisher: Springer Science and Business Media LLC
Date: 06-1986
DOI: 10.1007/BF01323425
Covalent Graphene‐MOF Hybrids for High‐Performance Asymmetric Supercapacitors
Publisher: Wiley
Date: 04-12-2020
Dynamical evolution of Ge quantum dots on Si(111): From island formation to high temperature decay
Publisher: Wiley
Date: 22-04-2022
DOI: 10.1002/AGT2.201
Abstract: Heteroepitaxial growth is a process of profound fundamental importance as well as an avenue to realize nanostructures such as Ge/Si quantum dots (QDs), with appealing properties for applications in opto‐ and nanoelectronics. However, controlling the Ge/Si QD size, shape, and composition remains a major obstacle to their practical implementation. Here, Ge nanostructures on Si(111) were investigated in situ and in real‐time by low energy electron microscopy (LEEM), enabling the observation of the transition from wetting layer formation to 3D island growth and decay. The island size, shape, and distribution depend strongly on the growth temperature. As the deposition temperature increases, the islands become larger and sparser, consistent with Brownian nucleation and capture dynamics. At 550°C, two distinct Ge/Si nanostructures are formed with bright and dark appearances that correspond to flat, atoll‐like and tall, faceted islands, respectively. During annealing, the faceted islands increase in size at the expense of the flat ones, indicating that the faceted islands are thermodynamically more stable. In contrast, triangular islands with uniform morphology are obtained from deposition at 600°C, suggesting that the growth more closely follows the ideal shape. During annealing, the islands formed at 600°C initially show no change in morphology and size and then rupture simultaneously, signaling a homogeneous chemical potential of the islands. These observations reveal the role of dynamics and energetics in the evolution of Ge/Si QDs, which can serve as a step towards the precise control over the Ge nanostructure size, shape, composition, and distribution on Si(111).
Erratum: Corrigendum to ''Evolution of epitaxial graphene layers on 3C SiC/Si (111) as a function of annealing temperature in UHV'' [Carbon 68 (2014) 563-572]
Publisher: Elsevier BV
Date: 04-2015
Thin randomly aligned hierarchical carbon nanotube arrays as ultrablack metamaterials
Publisher: American Physical Society (APS)
Date: 11-07-2017
Applications of low-cost sensing technologies for air quality monitoring and exposure assessment: How far have they gone?
Publisher: Elsevier BV
Date: 07-2018
Self-assembly of Au nano-islands with tuneable organized disorder for highly sensitive SERS
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC01231A
Abstract: A thermophoretically driven Au aerosol deposition process is used for the self-assembly of thin films consisting of plasmonic nano-islands (NIs) with a controllable and highly reproducible degree of disorder resulting in long-range periodicity with self-similar properties and stochastically distributed hot-spots, benefitting their applications as SERS substrates.
High performance solid-state supercapacitors based on compressed graphene foam
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA13914G
Abstract: Flexible and solid-state supercapacitors are made using compressed graphene foams as electrodes and highly conductive carbon nanotube (CNT) films as current collectors.
The transition from 3C SiC(111) to graphene captured by Ultra High Vacuum Scanning Tunneling Microscopy
Publisher: Elsevier BV
Date: 09-2015
The local structure of random ternary alloys by EXAFS
Publisher: Elsevier BV
Date: 08-1984
Low‐Cost Alternative High‐Performance Hole‐Transport Material for Perovskite Solar Cells and Its Comparative Study with Conventional SPIRO‐OMeTAD
Publisher: Wiley
Date: 04-07-2017
Erratum to “Formation of the wetting layer in Ge/Si(111) studied by STM and XAFS”
Publisher: Elsevier BV
Date: 10-2001
Influence of indoor airflow on particle spread of a single breath and cough in enclosures: Does opening a window really ‘help’?
Publisher: Elsevier BV
Date: 07-2022
Graphene-based thin film supercapacitor with graphene oxide as dielectric spacer
Publisher: AIP Publishing
Date: 05-08-2013
DOI: 10.1063/1.4818337
Abstract: Thin film supercapacitors are produced by using electrochemically exfoliated graphene (G) and wet-chemically produced graphene oxide (GO). Either G/GO/G stacked film or sole GO film are sandwiched by two Au films to make devices, where GO is the dielectric spacer. The addition of graphene film can increase the capacitance about two times, compared to the simple Au electrode. It is found that the GO film has very high dielectric constant, accounting for the high capacitance. AC measurement reveals that the relative permittivity of GO is in the order of 104 within the frequency range of 0.1–70 Hz.
ATOMIC FORCE MICROSCOPY MEASUREMENTS OF BOVINE SERUM ALBUMIN ADHESION FORCES ON SURFACES
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2008
DOI: 10.1142/S0219581X08005468
Abstract: A novel, direct technique has been developed to measure the interactions of bovine serum albumin (BSA) on surfaces by using atomic force microscopy (AFM) in a liquid environment. We have been able to measure adhesion forces between proteins and substrate surfaces in phosphate-buffered saline (PBS) solution directly, without any modification to the substrate and the AFM tip. Two different surfaces have been used in the measurements: mica (hydrophilic surface) and polystyrene (hydrophobic surface). The results show that a polystyrene surface has larger adhesion forces to BSA than a mica surface. This is consistent with previous research, which demonstrated that hydrophobic surfaces enhance protein adhesion but hydrophilic surfaces do not.
EXAFS measurements on FeB metallic glasses: Asymmetry of the radial distribution function
Publisher: Elsevier BV
Date: 03-1981
A Microanalytical Study of the Surfaces of Normal, Delipidized, and Artificially “Resurfaced” Articular Cartilage
Publisher: Informa UK Limited
Date: 05-12-2011
DOI: 10.3109/03008207.2011.630764
Abstract: The surface amorphous layer of articular cartilage is of primary importance to its load-bearing and lubrication function. This lipid-filled layer is degraded/disrupted or eliminated when cartilage degenerates due to diseases. This article examines further the characteristic of this surface overlay using a combination of microscopy and imaging methods to evaluate the hypothesis that the surface of articular cartilage can be repaired by exposing degraded cartilage to aqueous synthetic lipid mixtures. The preliminary results demonstrate that it is possible to create a new surface layer of phospholipids on the surface of cartilage following artificial lipid removal, but such a layer does not possess enough mechanical strength for physiological function when created with either unsaturated palmitoyl-oleoyl-phosphatidylcholine or saturated dipalmitoyl-phosphatidylcholine component of joint lipid composition alone. We conclude that this may be due to low structural cohesivity, inadequate time of exposure, and the mix/content of lipid in the incubation environment.
Recent advancements in metal organic framework based electrodes for supercapacitors
Publisher: No publisher found
Date: 2018
Examining the electrical and chemical properties of reduced graphene oxide with varying annealing temperatures in argon atmosphere
Publisher: Elsevier BV
Date: 11-2015
Fabrication and Mechanical and Thermal Behaviour of Graphene Oxide/Epoxy Nanocomposites
Publisher: DEStech Publications
Date: 2013
Microscopic and spectroscopic study of self-ordering in poly(3-hexylthiophene)/carbon nanotubes nanocomposites
Publisher: American Scientific Publishers
Date: 12-2006
DOI: 10.1166/JNN.2006.678
Abstract: Poly(3-hexylthiophene)-single-walled carbon nanotubes (SWNTs) composites were studied using UV-visible absorbance and Raman spectroscopy, scanning tunneling microscopy (STM) and transmission electron microscopy (TEM). Monolayers of regioregular poly(3-hexyl thiophene) (rrP3HT) adsorbed on SWNTs have been imaged using scanning tunneling microscopy (STM) to obtain measurements of the chiral angles at which the thiophene polymer chains wrap around in idual carbon nanotubes (41-48 degrees with respect to nanotube axis) and polymer interchain spacings (1.68 angstroms). The rrP3HT interchain distance is greater for rrP3HT monolayers adsorbed onto the curved surfaces of SWNTs than on the flat surfaces of highly ordered pyrolytic graphite s les (1.4 angstroms). UV-vis spectroscopic data provided strong evidence for increased interchain interactions in composites of rrP3HT and SWNTs compared to the pure polymer. The STM local-probe studies of the native polymer and the composites further confirmed that the rrP3HT interacts with carbon nanotubes to produce a highly ordered material at the molecular level.
Graphene Synthesized on Cubic- SiC(001) in Ultrahigh Vacuum: Atomic and Electronic Structure and Transport Properties
Publisher: Jenny Stanford Publishing
Date: 08-09-2017
Periodic arrangement of mono-dispersed gold nanoparticles for high performance polymeric solar cells
Publisher: IEEE
Date: 07-2015
Diffusion and Kinetics in Epitaxial Graphene Growth on SiC
Publisher: Jenny Stanford Publishing
Date: 08-09-2017
Atomic Intercalation at the SiC— Graphene Interface
Publisher: Jenny Stanford Publishing
Date: 08-09-2017
Design and flight testing of an integrated solar powered UAV and WSN for remote gas sensing
Publisher: IEEE
Date: 03-2015
Current-voltage characteristics of poly(3-hexylthiophene) diodes at room temperature
Publisher: AIP Publishing
Date: 23-02-2009
DOI: 10.1063/1.3086882
Abstract: We report on the analysis of current-voltage characteristics of regioregular poly(3-hexylthiophene) diodes. Experimental curves were fitted to two models, to take into account at low-moderate electric fields Schottky behavior mixed with space charge limited current (SCLC) regime and, at higher fields, trap-free SCLC. The results provide a description of IV curves over five decades, along with the determination of zero field and effective mobility and the field dependence prefactor. Forward and reverse IV measurements highlighted the presence of shallow and deep localized states inside the band gap. The latter enhance the current over time and have been modeled as an inductorlike element.
Study of laser-deposited Bi2Sr2CaCu2O8 + δ thin films by rutherford backscattering, X-ray photoemission and X-ray Auger spectroscopies
Publisher: Elsevier BV
Date: 05-1989
Quasi free-standing epitaxial graphene fabrication on 3C-SiC/Si(111)
Publisher: IOP Publishing
Date: 15-02-2018
Abstract: Growing graphene on SiC thin films on Si is a cheaper alternative to the growth on bulk SiC, and for this reason it has been recently intensively investigated. Here we study the effect of hydrogen intercalation on epitaxial graphene obtained by high temperature annealing on 3C-SiC/Si(111) in ultra-high vacuum. By using a combination of core-level photoelectron spectroscopy, low energy electron diffraction, and near-edge x-ray absorption fine structure (NEXAFS) we find that hydrogen saturates the Si atoms at the topmost layer of the substrate, leading to free-standing graphene on 3C-SiC/Si(111). The intercalated hydrogen fully desorbs after heating the s le at 850 °C and the buffer layer appears again, similar to what has been reported for bulk SiC. However, the NEXAFS analysis sheds new light on the effect of hydrogen intercalation, showing an improvement of graphene's flatness after annealing in atomic H at 600 °C. These results provide new insight into free-standing graphene fabrication on SiC/Si thin films.
A comparison study on hydrogen sensing performance of Pt/MoO3 nanoplatelets coated with a thin layer of Ta2 O5 or La 2 O3
Publisher: IEEE
Date: 04-2013
STM study of sapphyrin films deposited on gold substrates by the Langmuir–Blodgett technique
Publisher: Elsevier BV
Date: 11-2000
The nanonail flower
Publisher: Elsevier BV
Date: 07-2014
Multi-heteroatom doped nanocarbons for high performance double carbon potassium ion capacitor
Publisher: Elsevier BV
Date: 09-2021
Study of Pb-based and Pb-free perovskite solar cells using Cu-doped Ni1-xO thin films as hole transport material
Publisher: Elsevier BV
Date: 06-2022
Structural and electronic properties of Fe and TiFe from extended and near-edge x-ray-absorption structure
Publisher: American Physical Society (APS)
Date: 15-04-1983
2D MoS2 Heterostructures on Epitaxial and Self‐Standing Graphene for Energy Storage: From Growth Mechanism to Application
Publisher: Wiley
Date: 13-10-2021
Abstract: Layered molybdenum disulphide (MoS 2 ) crystals in combination with graphene create the opportunity for the development of heterostructures with tailored surface and structural properties for energy storage applications. Herein, 2D heterostructures are developed by growing MoS 2 on epitaxial and self‐standing nanoporous graphene (NPG) using chemical vapor deposition (CVD). The effect of substrate as well as different CVD growth parameters such as temperature, amount of sulfur and MoO 3 precursors, and argon flow on the growth of MoS 2 is systematically investigated. Interestingly, various structures of MoS 2 such as monolayer triangular islands, spirals, standing sheets, and irregular stacked multilayered MoS 2 are successfully developed. The growth mechanism is proposed using different advanced characterization techniques. The formation of a continuous wetting layer with grain boundaries over the surface prior to formation of any other structures is detected. As a proof of principle, MoS 2 /NPG is employed for the first time as anode material in potassium ion battery. The electrode delivers a specific capacity of 389 mAh g −1 with over 98% stability after 200 cycles. The porous structures clearly facilitate the ion transport which is beneficial for the ion battery. These encouraging results open new opportunities to develop hierarchical heterostructures of 2D‐materials for next‐generation energy storage technologies.
Short-range order and clustering in Ga1−xAlxAs and its heterostructures
Publisher: Elsevier BV
Date: 11-1985
Nitrogen, phosphorus co-doped holey rGO as a cathode material for Li-ion capacitors (LICs)
Publisher: Elsevier BV
Date: 12-2023
Supercapacitors: A new source of power for electric cars?
Publisher: Elsevier BV
Date: 03-2019
Early stages of the HFCVD process on multi-vicinal silicon surfaces studied by electron microscopy probes (SEM, TEM)
Publisher: Elsevier BV
Date: 09-2001
The Local Structure of Random Ternary Alloys: Experiment Versus Theory
Publisher: Springer New York
Date: 1985
Hydrogen gas sensing performance of a Pt/graphene/SiC device
Publisher: IEEE
Date: 06-2011
High performance all-carbon thin film supercapacitors
Publisher: Elsevier BV
Date: 2015
Influence of biodiesel fuel composition on the morphology and microstructure of particles emitted from diesel engines
Publisher: Elsevier BV
Date: 08-2016
Formation of the wetting layer in Ge/Si(111) studied by STM and XAFS
Publisher: Elsevier BV
Date: 07-2000
Ordering of Ge quantum dots on silicon surfaces via bottom-up and top-down approaches
Publisher: IEEE
Date: 02-2008
Charge-density-wave STM observation inη −
Publisher:
American Physical Society (APS)
Date:
05-04-2001
Publisher: American Physical Society (APS)
Date: 05-04-2001
Complexes of conjugated polymer and carbon nanotubes: does blending with nanotubes influence the ordering of semi-crystalline polymers?
Publisher: Springer Science and Business Media LLC
Date: 2005
DOI: 10.1557/PROC-0901-RB21-01
Abstract: A detailed study of poly(alkylthiophene) self-assembly and organization on single-walled carbon nanotubes is presented. We show that ordered polymer domains are formed when a conjugated polymer is blended with small amounts of carbon nanotubes. By correlating the lowest energy feature in the absorption spectra of the polymer with ordering, we demonstrate that the degree of ordering in the polymer is enhanced when it is blended with carbon nanotubes. Furthermore, we elucidated the conformation of the polymer chain when it is absorbed onto the nanotube surface and imaged the high degree of ordering in the polymer/carbon nanotube complex by microscopy.
Phase diagram of theFe 1
Publisher:
American Physical Society (APS)
Date:
15-02-1991
Publisher: American Physical Society (APS)
Date: 15-02-1991
Efficiency enhancement of Cu2ZnSnS4 thin film solar cells by chromium doping
Publisher: Elsevier BV
Date: 10-2019
Electronic structure of epitaxial β-FeSi2 on Si(111)
Publisher: Elsevier BV
Date: 07-1991
Carbon nanotube synthesis from germanium nanoparticles on patterned substrates
Publisher: Elsevier BV
Date: 08-2010
MoS2/Epitaxial graphene layered electrodes for solid-state supercapacitors
Publisher: IOP Publishing
Date: 15-02-2021
Abstract: The potential of transition metal dichalcogenides such as MoS 2 for energy storage has been significantly limited so far by the lack of conductivity and structural stability. Employing highly conductive, graphitic materials in combination with transition metal dichalcogenides can address this gap. Here, we explore the use of a layered electrode structure for solid-state supercapacitors, made of MoS 2 and epitaxial graphene (EG) on cubic silicon carbide for on-silicon energy storage. We show that the energy storage of the solid-state supercapacitors can be significantly increased by creating layered MoS 2 /graphene electrodes, yielding a substantial improvement as compared to electrodes using either EG or MoS 2 alone. We conclude that the conductivity of EG and the growth morphology of MoS 2 on graphene play an enabling role in the successful use of transition metal dichalcogenides for on-chip energy storage.
Real-time studies of Ge growth on nanostructured Si substrates
Publisher: Elsevier BV
Date: 15-12-2003
Epitaxial graphene growth on FIB patterned 3C-SiC nanostructures on Si (111): reducing milling damage
Publisher: IOP Publishing
Date: 24-07-2017
Abstract: Epitaxial growth of graphene on SiC is a scalable procedure that does not require any further transfer step, making this an ideal platform for graphene nanostructure fabrication. Focused ion beam (FIB) is a very promising tool for exploring the reduction of the lateral dimension of graphene on SiC to the nanometre scale. However, exposure of graphene to the Ga
Photonic Fractal Metamaterials: A Metal–Semiconductor Platform with Enhanced Volatile‐Compound Sensing Performance
Publisher: Wiley
Date: 22-10-2020
Nanostructured Dielectric Fractals on Resonant Plasmonic Metasurfaces for Selective and Sensitive Optical Sensing of Volatile Compounds
Publisher: Wiley
Date: 04-06-2018
Abstract: Advances in the understanding and fabrication of plasmonic nanostructures have led to a plethora of unprecedented optoelectronic and optochemical applications. Plasmon resonance has found widespread use in efficient optical transducers of refractive index changes in liquids. However, it has proven challenging to translate these achievements to the selective detection of gases, which typically adsorb non-specifically and induce refractive index changes below the detection limit. Here, it's shown that integration of tailored fractals of dielectric TiO
Self-assembly of InAs and Si/Ge quantum dots on structured surfaces
Publisher: IOP Publishing
Date: 17-04-2004
STM studies of GeSi thin layers epitaxially grown on Si(111)
Publisher: Elsevier BV
Date: 08-1996
Simulation of perovskite solar cells using molybdenum oxide thin films as interfacial layer for enhancing device performance
Publisher: Elsevier BV
Date: 07-2022
Influence of patterning on the nucleation of Ge islands on Si and SiO2 surfaces
Publisher: Elsevier BV
Date: 07-2007
Influence of dispersed carbon nanotubes on the optical and structural properties of a conjugated polymer
Publisher: SPIE
Date: 28-12-2006
DOI: 10.1117/12.638671
Utilizing p-type native oxide on liquid metal microdroplets for low temperature gas sensing
Publisher: Elsevier BV
Date: 05-2017
Double grain boundary configurations on graphite surfaces
Publisher: Elsevier BV
Date: 12-2020
Scanning tunneling microscopy studies of Ge/Si films on Si(111): From layer by layer to quantum dots
Publisher: American Vacuum Society
Date: 05-1998
DOI: 10.1116/1.589938
Abstract: We have followed by scanning tunneling microscopy (STM) the growth of thin Ge films obtained by reactive deposition epitaxy on the Si(111) surface kept at 500 °C. For Ge thickness smaller than 0.45 monolayers (ML), STM images show large 7×7 flat regions without protrusions while at higher coverages flat, triangular 5×5 islands start nucleating. We have followed the evolution of this wetting layer up to its completion and investigated its surface composition at 3 ML by current imaging tunneling spectroscopy measurements. At larger coverages thick Ge islands (quantum dots) start to nucleate according to the Stranski-Krastanov mechanism. We analyze the evolution of the lattice strain both on the wetting layer and on the islands up to 15 ML coverage. A clear expansion of the lattice parameter as a function of the coverage is evidenced both on the islands’ top and on the wetting layer. The luminescence yield measured at 10 K on s les covered by 40 Å of Ge and capped with 10 Å of Si evidences a structure that could be assigned to Ge quantum dots.
Acene-based organic semiconductors for organic light-emitting diodes and perovskite solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TC01956H
Abstract: A series of strong electron-rich small molecules based on acenes were designed and synthesized for application in green/blue organic light-emitting diodes and perovskite solar cells.
Hydrothermally formed functional niobium oxide doped tungsten nanorods
Publisher: IOP Publishing
Date: 14-11-2013
DOI: 10.1088/0957-4484/24/49/495501
Abstract: Nanorod forms of metal oxides are recognized as one of the most remarkable morphologies. Their structure and functionality have driven important advancements in a vast range of electronic devices and applications. In this work, we postulate a novel concept to explain how numerous localized surface states can be engineered into the bandgap of niobium oxide nanorods using tungsten. We discuss their contributions as local state surface charges for the modulation of a Schottky barrier height, the relative dielectric constant and their respective conduction mechanisms. Their effects on hydrogen gas molecule interaction mechanisms are also examined herein. We synthesized niobium tungsten oxide (Nb17W2O25) nanorods via a hydrothermal growth method and evaluated the Schottky barrier height, ideality factor, dielectric constant and trap energy level from the measured I-V versus temperature characteristics in the presence of air and hydrogen to show the validity of our postulations.
Graphene-based supercapacitor with carbon nanotube film as highly efficient current collector
Publisher: IOP Publishing
Date: 10-10-2014
DOI: 10.1088/0957-4484/25/43/435405
Abstract: Flexible graphene-based thin film supercapacitors were made using carbon nanotube (CNT) films as current collectors and graphene films as electrodes. The graphene sheets were produced by simple electrochemical exfoliation, while the graphene films with controlled thickness were prepared by vacuum filtration. The solid-state supercapacitor was made by using two graphene/CNT films on plastic substrates to sandwich a thin layer of gelled electrolyte. We found that the thin graphene film with thickness <1 μm can greatly increase the capacitance. Using only CNT films as electrodes, the device exhibited a capacitance as low as ∼0.4 mF cm(-2), whereas by adding a 360 nm thick graphene film to the CNT electrodes led to a ∼4.3 mF cm(-2) capacitance. We experimentally demonstrated that the conductive CNT film is equivalent to gold as a current collector while it provides a stronger binding force to the graphene film. Combining the high capacitance of the thin graphene film and the high conductivity of the CNT film, our devices exhibited high energy density (8-14 Wh kg(-1)) and power density (250-450 kW kg(-1)).
Combination effect of waviness and vacancy defects on the natural frequency of single walled carbon nanotubes
Publisher: American Scientific Publishers
Date: 08-2016
Towards nanomemories: Ge growth on naturally and artificially nanostructured Si surfaces
Publisher: IEEE
Date: 07-2006
Comparative study of Ag growth on GaAs(001) and (110) surfaces
Publisher: Elsevier BV
Date: 12-1998
Plasma‐Induced Nanocrystalline Domain Engineering and Surface Passivation in Mesoporous Chalcogenide Semiconductor Thin Films
Publisher: Wiley
Date: 11-02-2022
Abstract: The synthesis of highly crystalline mesoporous materials is key to realizing high‐performance chemical and biological sensors and optoelectronics. However, minimizing surface oxidation and enhancing the domain size without affecting the porous nanoarchitecture are daunting challenges. Herein, we report a hybrid technique that combines bottom‐up electrochemical growth with top‐down plasma treatment to produce mesoporous semiconductors with large crystalline domain sizes and excellent surface passivation. By passivating unsaturated bonds without incorporating any chemical or physical layers, these films show better stability and enhancement in the optoelectronic properties of mesoporous copper telluride (CuTe) with different pore diameters. These results provide exciting opportunities for the development of long‐term, stable, and high‐performance mesoporous semiconductor materials for future technologies.
Effects of substrate curvature on the adsorption of poly(3-hexylthiophene) on single-walled carbon nanotubes
Publisher: AIP Publishing
Date: 30-01-2006
DOI: 10.1063/1.2168514
Abstract: A detailed study of poly(alkylthiophene) self-assembly and organization on single-walled carbon nanotubes (SWNTs) is presented. Monolayers of regioregular poly(3-hexyl thiophene) (rrP3HT) adsorbed on SWNTs have been imaged by using scanning tunneling microscopy. Our results show that the rrP3HT interchain distance is greater for rrP3HT monolayers adsorbed onto the curved surfaces of SWNTs than on the flat surfaces of highly ordered pyrolytic graphite s les. Comparisons between the native polymer deposited on graphite and the composite structure confirmed that the presence of carbon nanotubes in rrP3HT produces a new material with a high degree of order at the molecular level.
Improving the hydrogen gas sensing performance of Pt/MoO3 nanoplatelets using a nano thick layer of La2 O3
Publisher: Elsevier BV
Date: 10-2013
Low-temperature synthesis of carbon nanotubes on indium tin oxide electrodes for organic solar cells
Publisher: Beilstein Institut
Date: 19-07-2012
DOI: 10.3762/BJNANO.3.60
Abstract: The electrical performance of indium tin oxide (ITO) coated glass was improved by including a controlled layer of carbon nanotubes directly on top of the ITO film. Multiwall carbon nanotubes (MWCNTs) were synthesized by chemical vapor deposition, using ultrathin Fe layers as catalyst. The process parameters (temperature, gas flow and duration) were carefully refined to obtain the appropriate size and density of MWCNTs with a minimum decrease of the light harvesting in the cell. When used as anodes for organic solar cells based on poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM), the MWCNT-enhanced electrodes are found to improve the charge-carrier extraction from the photoactive blend, thanks to the additional percolation paths provided by the CNTs. The work function of as-modified ITO surfaces was measured by the Kelvin probe method to be 4.95 eV, resulting in an improved matching to the highest occupied molecular orbital level of the P3HT. This is in turn expected to increase the hole transport and collection at the anode, contributing to the significant increase of current density and open-circuit voltage observed in test cells created with such MWCNT-enhanced electrodes.
Graphene ripples generated by grain boundaries in highly ordered pyrolytic graphite
Publisher: Elsevier BV
Date: 03-2014
Self-organization in composites of poly(3-hexylthiophene) and singlewalled carbon nanotubes designed for use in photovoltaic applications
Publisher: SPIE
Date: 28-12-2006
DOI: 10.1117/12.638665
Development of new gas sensors based on oxidized galinstan
Publisher: IEEE
Date: 11-2015
Growth mode of 2-mercaptobenzoxazole on Cu(100) studied by scanning tunneling microscopy
Publisher: Elsevier BV
Date: 12-2000
Room temperature gas sensing properties of ultrathin carbon nanotube films by surfactant-free dip coating
Publisher: Elsevier BV
Date: 05-2016
Plasmonic effect of gold nanoparticles in organic solar cells
Publisher: Elsevier BV
Date: 08-2014
Kelvin probe and scanning tunneling microscope characterization of Langmuir–Blodgett sapphyrin films
Publisher: AIP Publishing
Date: 30-08-1999
DOI: 10.1063/1.124653
Template based sintering of WO3 nanoparticles into porous tungsten oxide nanofibers for acetone sensing applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TC05982A
Abstract: Porous WO 3 nanofibers have been synthesized by electrospinning polyvinylpyrrolidone (PVP) nanofibers embedded with semiconducting WO 3 nanoparticles followed by annealing in air and have been tested toward acetone.
STM/AFM study of Ge quantum dots grown on Si[111]
Publisher: IEEE
Date: 2000
Plasmonic effect of annealed gold islands for improving efficiency of organic solar cells
Publisher: Informa UK Limited
Date: 18-11-2014
Low-operating temperature NO2 gas sensors based on hybrid two-dimensional SnS2-reduced graphene oxide
Publisher: Elsevier BV
Date: 12-2018
Iron disilicide growth on Si(111): a scanning tunneling microscopy investigation
Publisher: Elsevier BV
Date: 03-1993
Group-IV 2D materials beyond graphene on nonmetal substrates: Challenges, recent progress, and future perspectives
Publisher: AIP Publishing
Date: 15-11-2019
DOI: 10.1063/1.5121276
Abstract: The family of two-dimensional materials has been expanding rapidly over the last few years. Within it, a special place is occupied by silicene, germanene, and stanene due to their inherent compatibility with the existing semiconductor technology (notably for the case of silicene and germanene). Although obtaining them is not trivial due to the lack of layered bulk counterparts from which they could be mechanically exfoliated, they have been recently synthesized on a number of metallic substrates. The remarkable interaction between metals and these puckered materials, however, strongly modifies their intrinsic electronic properties, and also jeopardizes their integration into functional devices. In this context, first experimental efforts are now being devoted to the synthesis of silicene, germanene, and stanene on nonmetal substrates. Here, we review these pioneering works, present the ongoing debate, analyze, and discuss the major technical challenges and finally suggest possible novel solutions worth exploring.
Synthesis and applications of carbon nanomaterials for energy generation and storage
Publisher: Beilstein Institut
Date: 02-2016
DOI: 10.3762/BJNANO.7.17
Abstract: The world is facing an energy crisis due to exponential population growth and limited availability of fossil fuels. Over the last 20 years, carbon, one of the most abundant materials found on earth, and its allotrope forms such as fullerenes, carbon nanotubes and graphene have been proposed as sources of energy generation and storage because of their extraordinary properties and ease of production. Various approaches for the synthesis and incorporation of carbon nanomaterials in organic photovoltaics and supercapacitors have been reviewed and discussed in this work, highlighting their benefits as compared to other materials commonly used in these devices. The use of fullerenes, carbon nanotubes and graphene in organic photovoltaics and supercapacitors is described in detail, explaining how their remarkable properties can enhance the efficiency of solar cells and energy storage in supercapacitors. Fullerenes, carbon nanotubes and graphene have all been included in solar cells with interesting results, although a number of problems are still to be overcome in order to achieve high efficiency and stability. However, the flexibility and the low cost of these materials provide the opportunity for many applications such as wearable and disposable electronics or mobile charging. The application of carbon nanotubes and graphene to supercapacitors is also discussed and reviewed in this work. Carbon nanotubes, in combination with graphene, can create a more porous film with extraordinary capacitive performance, paving the way to many practical applications from mobile phones to electric cars. In conclusion, we show that carbon nanomaterials, developed by inexpensive synthesis and process methods such as printing and roll-to-roll techniques, are ideal for the development of flexible devices for energy generation and storage – the key to the portable electronics of the future.
Self-assembly of noble metal-free graphene–copper plasmonic metasurfaces
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC02848G
Abstract: Graphene-protected Cu nanoislands as VOC plasmonic sensors.
GeSi intermixing in Ge nanostructures on Si(111): An XAFS versus STM study
Publisher: American Physical Society (APS)
Date: 30-01-2027
Nanostructures for sensors, electronics, energy and environment III
Publisher: Beilstein Institut
Date: 27-07-2017
DOI: 10.3762/BJNANO.8.154
Plasma-activated water for improved intercalation and pseudocapacitance of MnO2 supercapacitor electrodes
Publisher: Elsevier BV
Date: 06-2023
Composition of Ge(Si) islands in the growth of Ge on Si(111)
Publisher: AIP Publishing
Date: 31-05-2004
DOI: 10.1063/1.1758304
Energy loss study of the electronic structure of YBa2Cu3O7−δ high Tc superconductor
Publisher: Elsevier BV
Date: 10-1988
A thin film approach for SiC-derived graphene as an on-chip electrode for supercapacitors
Publisher: IOP Publishing
Date: 08-10-2015
DOI: 10.1088/0957-4484/26/43/434005
Abstract: We designed a nickel-assisted process to obtain graphene with sheet resistance as low as 80 Ω square(-1) from silicon carbide films on Si wafers with highly enhanced surface area. The silicon carbide film acts as both a template and source of graphitic carbon, while, simultaneously, the nickel induces porosity on the surface of the film by forming silicides during the annealing process which are subsequently removed. As stand-alone electrodes in supercapacitors, these transfer-free graphene-on-chip s les show a typical double-layer supercapacitive behaviour with gravimetric capacitance of up to 65 F g(-1). This work is the first attempt to produce graphene with high surface area from silicon carbide thin films for energy storage at the wafer-level and may open numerous opportunities for on-chip integrated energy storage applications.
Ge–Si intermixing in Ge quantum dots on Si
Publisher: Elsevier BV
Date: 12-2000
Electrochemically Exfoliated Graphene for Electrode Films: Effect of Graphene Flake Thickness on the Sheet Resistance and Capacitive Properties
Publisher: American Chemical Society (ACS)
Date: 18-10-2013
DOI: 10.1021/LA403159N
Abstract: We present an electrochemical exfoliation method to produce controlled thickness graphene flakes by ultrasound assistance. Bilayer graphene flakes are dominant in the final product by using sonication during the electrochemical exfoliation process, while without sonication the product contains a larger percentage of four-layer graphene flakes. Graphene sheets prepared by using the two procedures are processed into films to measure their respective sheet resistance and optical transmittance. Solid-state electrolyte supercapacitors are made using the two types of graphene films. Our study reveals that films with a higher content of multilayer graphene flakes are more conductive, and their resistance is more easily reduced by thermal annealing, making them suitable as transparent conducting films. The film with higher content of bilayer graphene flakes shows instead higher capacitance when used as electrode in a supercapacitor.
Fabrication of SiGe rings and holes on Si(001) by flash annealing
Publisher: Elsevier BV
Date: 10-2013
Bovine Serum Albumin Adhesion Force Measurements Using an Atomic Force Microscopy
Publisher: Trans Tech Publications Ltd.
Date: 09-02-2008
Photo-assisted Amperometric Acetone Sensing of PVP/WO3 Hybrid Nanofibers
Publisher: IEEE
Date: 10-2019
EXAFS characterization of partial pair correlation functions in Au1−xNix solid solutions
Publisher: Elsevier BV
Date: 06-1989
EXAFS and XANES studies of local order in oxide glasses: Manganese impurity defects and vanadium low symmetry complexes
Publisher: Elsevier BV
Date: 12-1987
EXAFS of Cd1−xZnxTe: A test of the random distribution in zincblende ternary alloys
Publisher: Elsevier BV
Date: 02-1985
Ge–Si intermixing in Ge quantum dots on Si(001) and Si(111)
Publisher: AIP Publishing
Date: 07-02-2000
DOI: 10.1063/1.125860
Adsorption, Deprotonation, and Decarboxylation of Isophthalic Acid on Cu(111).
Publisher: American Chemical Society (ACS)
Date: 22-05-2019
DOI: 10.1021/ACS.LANGMUIR.8B04233
Abstract: The surface-assisted reaction of rationally designed organic precursors is an emerging approach toward fabricating atomically precise nanostructures. Recently, on-surface decarboxylation has attracted attention due to its volatile by-products, which tend to leave the surface during the reaction means only the desired products are retained on the surface. However, in addition to acting as the reactive site, the carboxylic acid groups play a vital role in the adsorption configuration of small-molecule molecular precursors and therefore in the reaction pathways. Here, scanning tunnelling microscopy (STM), synchrotron radiation photoelectron spectroscopy (SRPES), and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy have been employed to characterize the monodeprotonated, fully deprotonated, and decarboxylated products of isophthalic acid (IPA) on Cu(111). IPA is partially reacted (monodeprotonated) upon adsorption on Cu(111) at room temperature. Angular-dependent X-ray photoelectron spectroscopy reveals that IPA initially anchors to the surface via the carboxylate group. After annealing, the molecule fully deprotonates and reorients so that it anchors to the surface via both carboxylate groups in a bipodal configuration. NEXAFS confirms that the molecule is tilted upon adsorption and after full deprotonation. Following decarboxylation, the flat-lying molecule forms into oligomeric motifs on the surface. This work demonstrates the importance of molecular adsorption geometry for on-surface reactions.
Few-layer MoS2 nanosheets with and without silicon nanoparticles as anodes for lithium-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2TA08886J
Abstract: NaCl crystals are employed as a substrate to grow MoS 2 nanosheets. On dissolving NaCl, the nanosheets are introduced to silicon nanoparticles using layer-by-layer assembly forming robust MoS 2 @Si anodes for lithium-ion batteries.
Time evolution of graphene growth on SiC as a function of annealing temperature
Publisher: Elsevier BV
Date: 03-2016
Role of Graphene Oxide Liquid Crystals in Hydrothermal Reduction and Supercapacitor Performance
Publisher: American Chemical Society (ACS)
Date: 22-08-2016
Abstract: The formation of liquid crystal (LC) phases in graphene oxide (GO) aqueous solution is utilized to develop high-performance supercapacitors. To investigate the effect of LC formation on the properties of subsequently reduced GO (rGO), we compare films prepared through blade-coating of viscous LC-GO solution and ultrasonic spray-coating of diluted GO aqueous dispersion. After hydrothermal reduction under identical conditions, the films show different morphology, oxygen content, and specific capacitance. Trapped water in the LC GO film plays a role in preventing restacking of sheets and facilitating the removal of oxygenated groups during the reduction process. In device architectures with either liquid or polymer electrolyte, the specific capacitance of the blade-coated film is twice as high as that of the spray-coated one. For a blade-coated film with mass loading of 0.115 mg/cm(2), the specific capacitance reaches 286 F/g in aqueous electrolyte and 263 F/g in gelled electrolyte, respectively. This study suggests a route to pilot-scale production of high-performance graphene supercapacitors through blade-coated LC-GO films.
High-performance graphene-based supercapacitors made by a scalable blade-coating approach
Publisher: IOP Publishing
Date: 08-03-2016
Correlation effects on theL 3 Publisher:
American Physical Society (APS)
Date:
15-11-1987
Publisher: American Physical Society (APS)
Date: 15-11-1987
Large-sized α-MoO3 layered single crystals for superior NO2 gas sensing
Publisher: Elsevier BV
Date: 06-2022
Reactivity of the Bi2Sr2CaCu2O8 and Bi1.7Pb0.3Sr2CaCu2O8 surfaces for d-metal overlayers
Publisher: Elsevier BV
Date: 06-1992
A Review of Supercapacitors Based on Graphene and Redox-Active Organic Materials
Publisher: MDPI AG
Date: 27-02-2019
DOI: 10.3390/MA12050703
Abstract: Supercapacitors are a highly promising class of energy storage devices due to their high power density and long life cycle. Conducting polymers (CPs) and organic molecules are potential candidates for improving supercapacitor electrodes due to their low cost, large specific pseudocapacitance and facile synthesis methods. Graphene, with its unique two-dimensional structure, shows high electrical conductivity, large specific surface area and outstanding mechanical properties, which makes it an excellent material for lithium ion batteries, fuel cells and supercapacitors. The combination of CPs and graphene as electrode material is expected to boost the properties of supercapacitors. In this review, we summarize recent reports on three different CP/graphene composites as electrode materials for supercapacitors, discussing synthesis and electrochemical performance. Novel flexible and wearable devices based on CP/graphene composites are introduced and discussed, with an eye to recent developments and challenges for future research directions.
On-Silicon Supercapacitors with Enhanced Storage Performance
Publisher: The Electrochemical Society
Date: 2017
DOI: 10.1149/2.0671704JES
Evidence of Conjugation Enhancement in P3HT/SWNT Mixtures for Organic Photovoltaics
Publisher: Springer Science and Business Media LLC
Date: 2011
DOI: 10.1557/OPL.2011.237
Abstract: Classical molecular dynamics (MD) simulations in conjunction with optical absorption and AFM/nano-Raman experiments are employed to relate the molecular-scale arrangement and conjugation of poly-3-hexylthiophene (P3HT) adsorbed onto single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). Taken together our results demonstrate the templating role of carbon nanotubes in increasing the π-conjugation length of the P3HT at the P3HT/carbon nanotube interface. The MD simulations show that SWNTs and MWNTs, due to their inherent 1-dimensional (1D) cylindrical shape and π-conjugation, planarize the P3HT molecules adsorbed at their surface and thus quench their torsional disorder, regardless of the P3HT conformation and nanotube chirality. This effect is more significant for higher SWNT weight fractions in the s le (since it is an interface effect). We investigated this effect experimentally by acquiring nano-Raman spectra in regions of high-MWNT/low-P3HT content in addition to optical absorption spectra of P3HT-SWNT composites with different SWNT concentrations . The increase in the P3HT conjugation is confirmed by a shift of a P3HT feature in the Raman spectrum when going from P3HT-rich to SWNT-rich areas in the mixture. The significance of this work for charge transfer at the P3HT-SWNT interface in bulk-heterojunction solar cells is discussed.
High quality epitaxial graphene by hydrogen-etching of 3C-SiC(111) thin-film on Si(111)
Publisher: IOP Publishing
Date: 09-02-2017
Abstract: Etching with atomic hydrogen, as a preparation step before the high-temperature growth process of graphene onto a thin 3C-SiC film grown on Si(111), greatly improves the structural quality of topmost graphene layers. Pit formation and island coalescence, which are typical of graphene growth by SiC graphitization, are quenched and accompanied by widening of the graphene domain sizes to hundreds of nanometers, and by a significant reduction in surface roughness down to a single substrate bilayer. The surface reconstructions expected for graphene and the underlying layer are shown with atomic resolution by scanning tunnelling microscopy. Spectroscopic features typical of graphene are measured by core-level photoemission and Raman spectroscopy.
Palladium clusters on graphite: A Bremsstrahlung Isochromat Spectroscopy study
Publisher: Elsevier BV
Date: 1990
Encapsulation of nanoparticles into single-crystal ZnO nanorods and microrods
Publisher: Beilstein Institut
Date: 16-04-2014
DOI: 10.3762/BJNANO.5.56
Abstract: One-dimensional single crystal incorporating functional nanoparticles of other materials could be an interesting platform for various applications. We studied the encapsulation of nanoparticles into single-crystal ZnO nanorods by exploiting the crystal growth of ZnO in aqueous solution. Two types of nanodiamonds with mean diameters of 10 nm and 40 nm, respectively, and polymer nanobeads with size of 200 nm have been used to study the encapsulation process. It was found that by regrowing these ZnO nanorods with nanoparticles attached to their surfaces, a full encapsulation of nanoparticles into nanorods can be achieved. We demonstrate that our low-temperature aqueous solution growth of ZnO nanorods do not affect or cause degradation of the nanoparticles of either inorganic or organic materials. This new growth method opens the way to a plethora of applications combining the properties of single crystal host and encapsulated nanoparticles. We perform micro-photoluminescence measurement on a single ZnO nanorod containing luminescent nanodiamonds and the spectrum has a different shape from that of naked nanodiamonds, revealing the cavity effect of ZnO nanorod.
Valence charge fluctuations inY
Publisher:
American Physical Society (APS)
Date:
10-1988
Publisher: American Physical Society (APS)
Date: 10-1988
Evolution of epitaxial graphene layers on 3C SiC/Si (1 1 1) as a function of annealing temperature in UHV
Publisher: Elsevier BV
Date: 03-2014
Crystallographic structure of ternary semiconducting alloys
Publisher: Elsevier BV
Date: 08-1985
Studies of lattice distortions in AuNi solid solutions by EXAFS and computer simulations
Publisher: Elsevier BV
Date: 08-1987
Metal–Organic Frameworks/Conducting Polymer Hydrogel Integrated Three-Dimensional Free-Standing Monoliths as Ultrahigh Loading Li–S Battery Electrodes
Publisher: American Chemical Society (ACS)
Date: 25-06-2019
DOI: 10.1021/ACS.NANOLETT.9B01033
Abstract: The lithium-sulfur (Li-S) system is a promising material for the next-generation of high energy density batteries with application extending from electrical vehicles to portable devices and aeronautics. Despite progress, the energy density of current Li-S technologies is still below that of conventional intercalation-type cathode materials due to limited stability and utilization efficiency at high sulfur loading. Here, we present a conducting polymer hydrogel integrated highly performing free-standing three-dimensional (3D) monolithic electrode architecture for Li-S batteries with superior electrochemical stability and energy density. The electrode layout consists of a highly conductive three-dimensional network of N,P codoped carbon with well-dispersed metal-organic framework nanodomains of ZIF-67 and HKUST-1. The hierarchical monolithic 3D carbon networks provide an excellent environment for charge and electrolyte transport as well as mechanical and chemical stability. The electrically integrated MOF nanodomains significantly enhance the sulfur loading and retention capabilities by inhibiting the release of lithium polysulfide specificities as well as improving the charge transfer efficiency at the electrolyte interface. Our optimal 3D carbon-HKUST-1 electrode architecture achieves a very high areal capacity of >16 mAh cm
Graphene growth on silicon carbide: A review (Phys. Status Solidi A 9∕2016)
Publisher: Wiley
Date: 09-2016
Effect of substrate polishing on the growth of graphene on 3C-SiC(111)/Si(111) by high temperature annealing
Publisher: IOP Publishing
Date: 21-03-2016
DOI: 10.1088/0957-4484/27/18/185601
Abstract: We analyse the effects of substrate polishing and of the epilayer thickness on the quality of graphene layers grown by high temperature annealing on 3C-SiC(111)/Si(111) by scanning tunnelling microscopy, x-ray photoelectron spectroscopy, Raman spectroscopy, low energy electron diffraction and high resolution angle resolved photoemission spectroscopy. The results provide a comprehensive set of data confirming the superior quality of the graphene layers obtained on polished substrates, and the limitations of the growth obtained on unpolished surfaces.
Lack of Political Will or Academic Inertia?
Publisher: SAGE Publications
Date: 09-2009
Graphene growth on silicon carbide: A review
Publisher: Wiley
Date: 02-06-2016
Controlling the quantum dot nucleation site
Publisher: Elsevier BV
Date: 08-2003
Evidence of Multiwall Carbon Nanotube Deformation Caused by Poly(3-hexylthiophene) Adhesion
Publisher: American Chemical Society (ACS)
Date: 07-03-2011
DOI: 10.1021/JP2000267
Evolution of the intermixing process in Ge/Si(111) self-assembled islands
Publisher: Elsevier BV
Date: 2002
Atomic bonding and thermodynamic properties of pseudo-binary semiconducting alloys
Publisher: IOP Publishing
Date: 10-07-1987
A hydrogen/methane sensor based on niobium tungsten oxide nanorods synthesised by hydrothermal method
Publisher: Elsevier BV
Date: 07-2013
Topological short-range disorder inAu
Publisher: American Physical Society (APS)
Date: 15-09-1988
Controlling the surface roughness of epitaxial SiC on silicon
Publisher: AIP Publishing
Date: 23-05-2014
DOI: 10.1063/1.4879237
Abstract: The surface of cubic silicon carbide (3C-SiC) hetero-epitaxial films grown on the (111) surface of silicon is a promising template for the subsequent epitaxial growth of III-V semiconductor layers and graphene. We investigate growth and post-growth approaches for controlling the surface roughness of epitaxial SiC to produce an optimal template. We first explore 3C-SiC growth on various degrees of offcut Si(111) substrates, although we observe that the SiC roughness tends to worsen as the degree of offcut increases. Hence we focus on post-growth approaches available on full wafers, comparing chemical mechanical polishing (CMP) and a novel plasma smoothening process. The CMP leads to a dramatic improvement, bringing the SiC surface roughness down to sub-nanometer level, though removing about 200 nm of the SiC layer. On the other hand, our proposed HCl plasma process appears very effective in smoothening selectively the sharpest surface topography, leading up to 30% improvement in SiC roughness with only about 50 nm thickness loss. We propose a simple physical model explaining the action of the plasma smoothening.
Low temperature CO sensitive nanostructured WO3 thin films doped with Fe
Publisher: Elsevier BV
Date: 02-2012
Investigation of Room Temperature Gas Sensing Properties of Metal-Organic Charge Transfer Complex CuTCNQF4
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TC03548E
Abstract: The ability to detect and monitor toxic and greenhouse gases is highly important, however to achieve this at room temperature and allow for remote sensing applications is a significant challenge.
Etch pits and tunnel barrier in chemically etched YBa2Cu3O7−δ crystals by scanning tunneling microscopy
Publisher: Elsevier BV
Date: 10-1992
Molecular-resolved imaging of the Hierarchical Self-Assembly of a conductive polymer at single-walled carbon nanotube interfaces
Publisher: IEEE
Date: 2006
EXAFS of the superconducting oxide BaPb1−xBixO3
Publisher: Elsevier BV
Date: 03-1984
Driving Ge Island Ordering on Nanostructured Si surfaces
Publisher: American Scientific Publishers
Date: 11-2011
Electronic structures of two-dimensional metallic oxides and bronzes
Publisher: Elsevier BV
Date: 06-2001
Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials
Publisher: Beilstein Institut
Date: 13-08-2018
DOI: 10.3762/BJNANO.9.202
Abstract: Electrospun one-dimensional (1D) nanostructures are rapidly emerging as key enabling components in gas sensing due to their unique electrical, optical, magnetic, thermal, mechanical and chemical properties. 1D nanostructures have found applications in numerous areas, including healthcare, energy storage, biotechnology, environmental monitoring, and defence/security. Their enhanced specific surface area, superior mechanical properties, nanoporosity and improved surface characteristics (in particular, uniformity and stability) have made them important active materials for gas sensing applications. Such highly sensitive and selective elements can be embedded in sensor nodes for internet-of-things applications or in mobile systems for continuous monitoring of air pollutants and greenhouse gases as well as for monitoring the well-being and health in everyday life. Herein, we review recent developments of gas sensors based on electrospun 1D nanostructures in different sensing platforms, including optical, conductometric and acoustic resonators. After explaining the principle of electrospinning, we classify sensors based on the type of materials used as an active sensing layer, including polymers, metal oxide semiconductors, graphene, and their composites or their functionalized forms. The material properties of these electrospun fibers and their sensing performance toward different analytes are explained in detail and correlated to the benefits and limitations for every approach.
Growth of graphene on cylindrical copper conductors as an anticorrosion coating: a microscopic study
Publisher: IOP Publishing
Date: 06-06-2016
DOI: 10.1088/0957-4484/27/28/285704
Abstract: We have successfully grown graphene film on the surface of cylindrical copper conductors by chemical vapour deposition. The quality and number of graphene layers have been investigated using Raman spectroscopy, Raman mapping and scanning electron microscopy, as a function of methane gas flow rate and of growth temperature. Transmission electron microscopy analysis has been performed to verify the number of graphene layers, confirming the results obtained by Raman spectroscopy. The results open up the possibility of using graphene as an anticorrosion coating for copper cables and earth grids.
Ultrasensitive NO2 Gas Sensors Based on Layered α‐MoO3 Nanoribbons
Publisher: Wiley
Date: 31-07-2021
Abstract: The detection and monitoring of nitrogen dioxide (NO 2 ) plays a vital role in the environmental, healthcare, farming, and industrial sectors. However, the development of NO 2 gas sensors with simultaneously high sensitivity, reversibility, low detection limit, and excellent selectivity remains challenging. In this work, an ultrasensitive NO 2 gas sensor with superb selectivity and reversibility is demonstrated based on α‐phase molybdenum trioxide (α‐MoO 3 ). Nanoribbons of α‐MoO 3 are synthesized via vapor phase transport (VPT) and systematically characterized using a combination of advanced characterization probes. At an optimal operating temperature of 125 °C, the α‐MoO 3 ‐based sensor shows a very high sensitivity toward NO 2 with a detection limit as low as 24 ppb, while also exhibiting excellent selectivity and reversibility. Such impressive performance originates from the layered nature of the α‐MoO 3 nanoribbons as well as the hierarchical assembly of the nanoribbons as the sensing layer. The study demonstrates a facile sensing platform based on α‐MoO 3 for ultrasensitive and selective NO 2 gas sensing.
Low temperature response of nanostructured tungsten oxide thin films toward hydrogen and ethanol
Publisher: Elsevier BV
Date: 10-2012
Self-assembling and ordering of Ge/Si(111) quantum dots: scanning microscopy probe studies
Publisher: IOP Publishing
Date: 22-08-2002
Dopant-free novel hole-transporting materials based on quinacridone dye for high-performance and humidity-stable mesoporous perovskite solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA11361K
Abstract: A series of novel pristine hole-transporting materials based on a quinacridone (QA) dye have been developed and used to fabricate mesoporous perovskite solar cells for the first time achieving an efficiency of 18.2%.
Topographic and spectroscopic analysis of ethylene adsorption on Si(111)7×7 by STM and STS
Publisher: American Physical Society (APS)
Date: 15-12-1993
Copper phthalocyanine on Si(111)-7 × 7 and Si(001)-2 × 1: an XPS/AES and STM study
Publisher: Elsevier BV
Date: 11-1994
Polyoxometalates (POMs)
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE03407J
Abstract: Polyoxometalates as anionic molecular metal oxides clusters with open frameworks and rich redox chemistry have outstanding versatility in energy conversion and storage research.
Growing Graphene on Semiconductors
Publisher: Jenny Stanford Publishing
Date: 08-09-2017
Transfer‐Free Synthesis of Lateral Graphene–Hexagonal Boron Nitride Heterostructures from Chemically Converted Epitaxial Graphene
Publisher: Wiley
Date: 08-07-2019
Conversion of n-Type CuTCNQ into p-Type Nitrogen-Doped CuO and the Implication for Room-Temperature Gas Sensing
Publisher: American Chemical Society (ACS)
Date: 14-09-2015
Polymer Self-assembly on Carbon Nanotubes
Publisher: Springer New York
Date: 20-09-2011
Electronic correlations inY Ba
Publisher: American Physical Society (APS)
Date: 12-1987
Towards a Controlled Growth of Self-assembled Nanostructures: Shaping, Ordering, and Localization in Ge/Si Heteroepitaxy
Publisher: Springer New York
Date: 20-09-2011
Formation of a two-dimensional alloy/surface phase: Auger and STM study of Cu(Sn)(111)
Publisher: Elsevier BV
Date: 05-1998
Ordering of Ge islands on Si(001) substrates patterned by nanoindentation
Publisher: Elsevier BV
Date: 04-2011
Electronic structure of the GaAs(001)2×4 and GaAs(110) surfaces studied by high-resolution electron-energy-loss spectroscopy
Publisher: American Physical Society (APS)
Date: 15-10-1998
Nanostructures for sensors, electronics, energy and environment II
Publisher: Beilstein Institut
Date: 23-09-2015
DOI: 10.3762/BJNANO.6.197
Bremsstrahlung-isochromat-spectroscopy and x-ray-photoelectron-spectroscopy investigation of the electronic structure of β-
Publisher:
American Physical Society (APS)
Date:
15-09-1990
Publisher: American Physical Society (APS)
Date: 15-09-1990
Supercapacitor Electrodes with Remarkable Specific Capacitance Converted from Hybrid Graphene Oxide/NaCl/Urea Films
Publisher: American Chemical Society (ACS)
Date: 26-06-2017
Abstract: A novel approach to improve the specific capacitance of reduced graphene oxide (rGO) films is reported. We combine the aqueous dispersion of liquid-crystalline GO incorporating salt and urea with a blade-coating technique to make hybrid films. After drying, stacked GO sheets mediated by solidified NaCl and urea are hydrothermally reduced, resulting in a nanoporous film consisting of rumpled N-doped rGO sheets. As a supercapacitor electrode, the film exhibits a high gravimetric specific capacitance of 425 F g
Fabrication of free-standing silicon carbide on silicon microstructures via massive silicon sublimation
Publisher: American Vacuum Society
Date: 28-09-2020
DOI: 10.1116/6.0000490
Abstract: Heteroepitaxial thin films of cubic silicon carbide (3C-SiC) on silicon offer a promising platform for leveraging the properties of SiC, such as wide bandgap, high mechanical strength, and chemical stability on a silicon substrate. Such heteroepitaxial films also attract considerable interest as pseudosubstrates for the growth of GaN as well as graphene on silicon wafers. However, due to a substantial lattice mismatch, the growth of 3C-SiC on silicon leads to a considerable amount of stresses, defects, and diffusion phenomena at the heterointerface. We show here that the extent of such interface phenomena and stresses is so large that, after patterning of the SiC, a massive sublimation of the silicon underneath the SiC/Si interface is promoted via a high-temperature anneal, either in high or medium vacuum ambient. A micrometer-thick air gap can be formed below the SiC structures, making them suspended. Hence, the described approach can be used as a straightforward methodology to form free-standing silicon carbide structures without the need for wet or anisotropic etching and could be of great interest for devices where suspended moving parts are needed, such as micro- and nanoelectromechanical systems.
Regioregular poly(3-hexyl-thiophene) helical self-organization on carbon nanotubes
Publisher: AIP Publishing
Date: 06-07-2009
DOI: 10.1063/1.3173825
Abstract: Mixtures of regioregular poly(3-hexyl-thiophene) (rrP3HT) and multiwall carbon nanotubes have been investigated by scanning tunneling microscopy in ultrahigh vacuum. Carbon nanotubes covered by rrP3HT have been imaged and analyzed, providing a clear evidence that this polymer self-assembles on the nanotube surface following geometrical constraints and adapting its equilibrium chain-to-chain distance. Largely spaced covered nanotubes have been analyzed to investigate the role played by nanotube chirality in the polymer wrapping, evidencing strong rrP3HT interactions along well defined directions.
Substrate-mediated growth of oriented, vertically aligned MoS2 nanosheets on vicinal and on-axis SiC substrates
Publisher: Elsevier BV
Date: 06-2021
Poly(3-hexyl-thiophene) coil-wrapped single wall carbon nanotube investigated by scanning tunneling spectroscopy
Publisher: AIP Publishing
Date: 05-10-2009
DOI: 10.1063/1.3241998
Abstract: Scanning tunneling spectroscopy was performed on a (15,0) single wall carbon nanotube partially wrapped by poly(3-hexyl-thiophene). On the bare nanotube section, the local density of states is in good agreement with the theoretical model based on local density approximation and remarkably is not perturbed by the polymer wrapping. On the coiled section, a rectifying current-voltage characteristic has been observed along with the charge transfer from the polymer to the nanotube. The electron transfer from poly(3-hexyl-thiophene) to metallic nanotube was previously theoretically proposed and contributes to the presence of the Schottky barrier at the interface responsible for the rectifying behavior.
Local structure of ternary semiconducting random solid solutions: Extended x-ray-absorption fine structure of
Publisher:
American Physical Society (APS)
Date:
15-08-1984
Publisher: American Physical Society (APS)
Date: 15-08-1984
Dynamic behavior of silver islands growing on GaAs(001)2×4 substrate
Publisher: Elsevier BV
Date: 2000
Preparation of graphene oxide/epoxy nanocomposites with significantly improved mechanical properties
Publisher: AIP Publishing
Date: 05-08-2014
DOI: 10.1063/1.4892089
Abstract: The effect of graphene oxide (GO) on the mechanical properties and the curing reaction of Diglycidyl Ether of Bisphenol A/F and Triethylenetetramine epoxy system was investigated. GO was prepared by oxidation of graphite flakes and characterized by spectroscopic and microscopic techniques. Epoxy nanocomposites were fabricated with different GO loading by solution mixing technique. It was found that incorporation of small amount of GO into the epoxy matrix significantly enhanced the mechanical properties of the epoxy. In particular, model I fracture toughness was increased by nearly 50% with the addition of 0.1 wt. % GO to epoxy. The toughening mechanism was understood by fractography analysis of the tested s les. The more irregular, coarse, and multi-plane fracture surfaces of the epoxy/GO nanocomposites were observed. This implies that the two-dimensional GO sheets effectively disturbed and deflected the crack propagation. At 0.5 wt. % GO, elastic modulus was ∼35% greater than neat epoxy. Differential scanning calorimetry (DSC) results showed that GO addition moderately affect the glass transition temperature (Tg) of epoxy. The maximum decrease of Tg by ∼7 °C was shown for the nanocomposite with 0.5 wt. % GO. DSC results further revealed that GO significantly hindered the cure reaction in the epoxy system.
Multi-wall carbon nanotube coating of fluorine-doped tin oxide as an electrode surface modifier for polymer solar cells
Publisher: Elsevier BV
Date: 03-2014
Electron effective attenuation length in epitaxial graphene on SiC
Publisher: IOP Publishing
Date: 11-2019
Abstract: The inelastic mean free path (IMFP) for carbon-based materials is notoriously challenging to model, and moving from bulk materials to 2D materials may exacerbate this problem, making the accurate measurements of IMFP in 2D carbon materials critical. The overlayer-film method is a common experimental method to estimate IMFP by measuring electron effective attenuation length (EAL). This estimation relies on an assumption that elastic scattering effects are negligible. We report here an experimental measurement of electron EAL in epitaxial graphene on SiC using photoelectron spectroscopy over an electron kinetic energy range of 50-1150 eV. We find a significant effect of the interface between the 2D carbon material and the substrate, indicating that the attenuation length in the so-called 'buffer layer' is smaller than for free-standing graphene. Our results also suggest that the existing models for estimating IMFPs may not adequately capture the physics of electron interactions in 2D materials.
Core-level changes induced by oxygen inYBa
Publisher:
American Physical Society (APS)
Date:
1991
Publisher: American Physical Society (APS)
Date: 1991
Highly NO2 sensitive caesium doped graphene oxide conductometric sensors
Publisher: Beilstein Institut
Date: 17-07-2014
DOI: 10.3762/BJNANO.5.120
Abstract: Here we report on the synthesis of caesium doped graphene oxide (GO-Cs) and its application to the development of a novel NO 2 gas sensor. The GO, synthesized by oxidation of graphite through chemical treatment, was doped with Cs by thermal solid-state reaction. The s les, dispersed in DI water by sonication, have been drop-casted on standard interdigitated Pt electrodes. The response of both pristine and Cs doped GO to NO 2 at room temperature is studied by varying the gas concentration. The developed GO-Cs sensor shows a higher response to NO 2 than the pristine GO based sensor due to the oxygen functional groups. The detection limit measured with GO-Cs sensor is ≈90 ppb.
Interface formation between d metals and the Bi2Sr2CaCu2O8 surface
Publisher: Elsevier BV
Date: 09-1991
Multiscale Plasma‐Catalytic On‐Surface Assembly
Publisher: Wiley
Date: 21-08-2020
Abstract: Controlled modification of surfaces is one of the key pursuits of the nanoscience and nanotechnology fields, allowing for the fabrication of bespoke materials with targeted functionalities. However, many surface modifications currently require painstakingly precise and/or energy intensive processing to implement, and are thus limited in scope and scale. Here, a concept which can enhance the capacity for control of surfaces is introduced: plasma-assisted nucleation and self-assembly at atomic to nanoscales, scalable at atmospheric pressures.
High‐Temperature Large‐Scale Self‐Assembly of Highly Faceted Monocrystalline Au Metasurfaces
Publisher: Wiley
Date: 20-11-2019
All‐Rounder Low‐Cost Dopant‐Free D‐A‐D Hole‐Transporting Materials for Efficient Indoor and Outdoor Performance of Perovskite Solar Cells
Publisher: Wiley
Date: 15-01-2020
Three-dimensional nitrogen-doped rGO-siloxene nanocomposite anode for Li-ion storage
Publisher: Elsevier BV
Date: 07-2023
Composition of Ge(Si) islands in the growth of Ge on Si(111) by x-ray spectromicroscopy
Publisher: AIP Publishing
Date: 24-01-2005
DOI: 10.1063/1.1832747
Abstract: The stoichiometry of Ge∕Si islands grown on Si(111) substrates at temperatures ranging from 460to560°C was investigated by x-ray photoemission electron microscopy (XPEEM). By developing a specific analytical framework, quantitative information on the surface Ge∕Si stoichiometry was extracted from laterally resolved XPEEM Si 2p and Ge 3d spectra, exploiting the chemical sensitivity of the technique. Our data show the existence of a correlation between the base area of the self-assembled islands and their average surface Si content: the larger the lateral dimensions of the 3D structures, the higher their relative Si concentration. The deposition temperature determines the characteristics of this relation, pointing to the thermal activation of kinetic diffusion processes.
Electronic properties of laser-deposited Bi2Sr2CaCu2O8+δ thin films by X-ray photoemission and X-ray auger spectroscopies
Publisher: Elsevier BV
Date: 1989
Ge/Si island nucleation and ordering on naturally and artificially patterned substrates
Publisher: SPIE
Date: 28-12-2005
DOI: 10.1117/12.638951
Towards controlled growth of carbon nanotubes from germanium on nanoindented silicon substrates
Publisher: IEEE
Date: 02-2010
Fabrication and characterisation of graphene oxide-epoxy nanocomposite
Publisher: SPIE
Date: 09-08-2013
DOI: 10.1117/12.2026759
Development of porous metal oxide thin films by co-evaporation
Publisher: Elsevier BV
Date: 03-2007
Metal phthalocyanines (MPc, MNi, Cu) on Cu(001) and Si(001) surfaces studied by XPS, XAS and STM
Publisher: Elsevier BV
Date: 12-1995
On-surface synthesis of polyethylenedioxythiophene
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC01465E
Abstract: On-surface synthesis of conjugated polymers is made challenging by the need to promote the desired reaction while preventing or minimizing unwanted ancillary reactions that compromise the product integrity.
Hybrid plasmonic-semiconducting fractal metamaterials for superior sensing of volatile compounds
Publisher: SPIE
Date: 30-12-2019
DOI: 10.1117/12.2539740
Porphyrin thin films coated quartz crystal microbalances prepared by electropolymerization technique
Publisher: Elsevier BV
Date: 10-1999
Evolution of strained Ge islands grown on Si(111): a scanning probe microscopy study
Publisher: Elsevier BV
Date: 09-1999
Development and Integration of a Solar Powered Unmanned Aerial Vehicle and a Wireless Sensor Network to Monitor Greenhouse Gases
Publisher: MDPI AG
Date: 11-02-2015
DOI: 10.3390/S150204072
The effect of graphene oxide and its oxidized debris on the cure chemistry and interphase structure of epoxy nanocomposites
Publisher: Elsevier BV
Date: 08-2015
Vibration analysis of initially curved single walled carbon nanotube with vacancy defect for ultrahigh frequency nanoresonators
Publisher: Springer Science and Business Media LLC
Date: 20-02-2016
One step facile synthesis of a novel anthanthrone dye-based, dopant-free hole transporting material for efficient and stable perovskite solar cells
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TC05238C
Abstract: A new dopant free stable HTM using anthanthrone dye has been reported with 11.5% efficiency.
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