ORCID Profile
0000-0002-2138-8716
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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)
Functional Materials | Colloid and Surface Chemistry | Nanotechnology | Materials Engineering | Nanomanufacturing | Materials engineering | Condensed Matter Physics | Metals and Alloy Materials | Chemical Characterisation of Materials | Composite and Hybrid Materials | Surfaces and Structural Properties of Condensed Matter | Nanoscale Characterisation | Plasma Physics; Fusion Plasmas; Electrical Discharges | Condensed Matter Imaging | Condensed Matter Characterisation Technique Development | Functional materials | Nanotechnology not elsewhere classified
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Hydrogen Production from Renewable Energy | Expanding Knowledge in the Environmental Sciences | Scientific Instruments | Fabricated Metal Products not elsewhere classified |
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.
Surface structure of Pd(111) with less than half a monolayer of Zn
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CP50793A
Abstract: We have characterized the structural properties of submonolayer amounts of Zn on Pd(111) using scanning tunneling microscopy (STM) and spot-profile analysis low energy electron diffraction (SPA-LEED). Following room temperature deposition of ≈0.06 monolayers (ML) Zn onto Pd(111), we observe the substitution of Zn for Pd in the surface layer. At ≈0.20 ML of deposited Zn, STM reveals a locally ordered phase with a (2/√3 × 2/√3)R30° unit cell located near Zn substitutions SPA-LEED patterns reveal the same periodicity. We attribute this phase to the metastable bonding of atoms or clusters predominantly in hollow sites surrounding Zn substitutions in the surface layer. At ≈0.4 ML, STM images reveal local (√3 × √3)R30° and (2 × 1) ordering on surfaces annealed to 350 K. At coverages near 0.5 ML, both STM and SPA-LEED show the onset of the formation of the (2 × 1) ordering associated with the Zn : Pd 1 : 1 alloy phase. At all coverages, the surface is dominated by island growth the islands' size and density is shown to depend critically on annealing at temperatures as low as 350 K. These results provide insight into the structural features of a Zn/Pd(111) coverage regime that has been much debated in recent years.
Inducing Nonlocal Reactions with a Local Probe
Publisher: American Chemical Society (ACS)
Date: 24-11-2009
DOI: 10.1021/NN901504M
Abstract: The scanning tunneling microscope (STM) has evolved continually since its invention, as scientists have expanded its use to encompass atomic-scale manipulation, momentum-resolved electronic characterization, localized chemical reactions (bond breaking and bond making) in adsorbed molecules, and even chain reactions at surfaces. This burgeoning field has recently expanded to include the use of the STM to inject hot electrons into substrate surface states the injected electrons can travel laterally and induce changes in chemical structure in molecules located up to 100 nm from the STM tip. We describe several key demonstrations of this phenomenon, including one appearing in this issue of ACS Nano by Chen et al. Possible applications for this technique are also discussed, including characterizing the dispersion of molecule-substrate interface states and the controlled patterning of molecular overlayers.
Metal Microsubstrates on Si(111): Crystallography, Morphology, and Interactions with a Molecular Adsorbate
Publisher: American Chemical Society (ACS)
Date: 03-06-2021
The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition of Mild Steel in Bicarbonate–Chloride Solution
Publisher: MDPI AG
Date: 26-10-2016
DOI: 10.3390/MA9110868
Naphthalene flanked diketopyrrolopyrrole: a new conjugated building block with hexyl or octyl alkyl side chains for electropolymerization studies and its biosensor applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9PY00430K
Abstract: Naphthalene flanked DPP with hexyl and octyl chain based electropolymerized conjugated polymers exhibits bio-sensing.
Thermal evolution of the submonolayer near-surface alloy of ZnPd on Pd(111)
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CP54782E
Abstract: We have performed a high-resolution synchrotron radiation photoelectron spectroscopy study of the initial growth stages of the ZnPd near-surface alloy on Pd(111), complemented by scanning tunnelling microscopy data. We show that the chemical environment for surfaces containing less than half of one monolayer of Zn is chemically distinct from subsequent layers. Surfaces where the deposition is performed at room temperature contain ZnPd islands surrounded by a substrate with dilute Zn substitutions. Annealing these surfaces drives the Zn towards the substrate top-layer, and favours the completion of the first 1 : 1 monolayer before the onset of growth in the next layer.
Investigation of thiophene flanked diketopyrrolopyrrole monomers with straight and branched alkyl chains and their electropolymerization study
Publisher: Springer Science and Business Media LLC
Date: 15-05-2017
DOI: 10.1557/JMR.2017.158
TLR2 on blood monocytes senses dengue virus infection and its expression correlates with disease pathogenesis
Publisher: Springer Science and Business Media LLC
Date: 23-06-2020
DOI: 10.1038/S41467-020-16849-7
Abstract: Vascular permeability and plasma leakage are immune-pathologies of severe dengue virus (DENV) infection, but the mechanisms underlying the exacerbated inflammation during DENV pathogenesis are unclear. Here, we demonstrate that TLR2, together with its co-receptors CD14 and TLR6, is an innate sensor of DENV particles inducing inflammatory cytokine expression and impairing vascular integrity in vitro. Blocking TLR2 prior to DENV infection in vitro abrogates NF-κB activation while CD14 and TLR6 block has a moderate effect. Moreover, TLR2 block prior to DENV infection of peripheral blood mononuclear cells prevents activation of human vascular endothelium, suggesting a potential role of the TLR2-responses in vascular integrity. TLR2 expression on CD14 + + classical monocytes isolated in an acute phase from DENV-infected pediatric patients correlates with severe disease development. Altogether, these data identify a role for TLR2 in DENV infection and provide insights into the complex interaction between the virus and innate receptors that may underlie disease pathogenesis.
Crystal Engineering in Two Dimensions: An Approach to Molecular Nanopatterning
Publisher: American Chemical Society (ACS)
Date: 20-10-2007
DOI: 10.1021/JP0762774
Direct-write crosslinking in vacuum-deposited small-molecule films using focussed ion and electron beams
Publisher: IOP Publishing
Date: 21-05-2019
Abstract: Recent advances in helium ion microscopy (HIM) have enabled the use of fine-focused He
The electronic properties of Si(001)–Bi(2 × n)
Publisher: IOP Publishing
Date: 15-01-2005
Si(557)-Ag: A metallic quasi-one-dimensional system
Publisher: American Physical Society (APS)
Date: 21-03-2008
Tip-induced C–H activation and oligomerization of thienoanthracenes
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CC03719G
Abstract: The tip of a scanning tunneling microscope (STM) can be used to dehydrogenate freely-diffusing tetrathienoanthracene (TTA) molecules on Cu(111), trapping the molecules into metal-coordinated oligomeric structures.
The critical role of water in spider silk and its consequence for protein mechanics
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR10502G
Abstract: Due to its remarkable mechanical and biological properties, there is considerable interest in understanding, and replicating, spider silk's stress-processing mechanisms and structure-function relationships. Here, we investigate the role of water in the nanoscale mechanics of the different regions in the spider silk fibre, and their relative contributions to stress processing. We propose that the inner core region, rich in spidroin II, retains water due to its inherent disorder, thereby providing a mechanism to dissipate energy as it breaks a sacrificial amide-water bond and gains order under strain, forming a stronger amide-amide bond. The spidroin I-rich outer core is more ordered under ambient conditions and is inherently stiffer and stronger, yet does not on its own provide high toughness. The markedly different interactions of the two proteins with water, and their distribution across the fibre, produce a stiffness differential and provide a balance between stiffness, strength and toughness under ambient conditions. Under wet conditions, this balance is destroyed as the stiff outer core material reverts to the behaviour of the inner core.
Electropolymerized Porous Polymer Films on Flexible Indium Tin Oxide Using Trifunctional Furan Substituted Benzene Conjugated Monomer for Biosensing
Publisher: American Chemical Society (ACS)
Date: 17-01-2020
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.
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.
Transfer‐Free Synthesis of Lateral Graphene–Hexagonal Boron Nitride Heterostructures from Chemically Converted Epitaxial Graphene
Publisher: Wiley
Date: 08-07-2019
Superhydrophobic Graphene-Like Nanocarbon Film Formation on Arbitrary Surfaces through MgO Nanoparticle Catalysis: Advanced Coatings for Energy Storage and Nanocomposites
Publisher: American Chemical Society (ACS)
Date: 14-09-2023
Substrate Effects in the Supramolecular Assembly of 1,3,5-Benzene Tricarboxylic Acid on Graphite and Graphene
Publisher: American Chemical Society (ACS)
Date: 03-02-2015
DOI: 10.1021/LA5048886
Abstract: The behavior of small molecules on a surface depends critically on both molecule-substrate and intermolecular interactions. We present here a detailed comparative investigation of 1,3,5-benzene tricarboxylic acid (trimesic acid, TMA) on two different surfaces: highly oriented pyrolytic graphite (HOPG) and single-layer graphene (SLG) grown on a polycrystalline Cu foil. On the basis of high-resolution scanning tunnelling microscopy (STM) images, we show that the epitaxy matrix for the hexagonal TMA chicken wire phase is identical on these two surfaces, and, using density functional theory (DFT) with a non-local van der Waals correlation contribution, we identify the most energetically favorable adsorption geometries. Simulated STM images based on these calculations suggest that the TMA lattice can stably adsorb on sites other than those identified to maximize binding interactions with the substrate. This is consistent with our net energy calculations that suggest that intermolecular interactions (TMA-TMA dimer bonding) are dominant over TMA-substrate interactions in stabilizing the system. STM images demonstrate the robustness of the TMA films on SLG, where the molecular network extends across the variable topography of the SLG substrates and remains intact after rinsing and drying the films. These results help to elucidate molecular behavior on SLG and suggest significant similarities between adsorption on HOPG and SLG.
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
Multi-heteroatom doped nanocarbons for high performance double carbon potassium ion capacitor
Publisher: Elsevier BV
Date: 09-2021
Carbon nanomaterials modified biomimetic dental implants for diabetic patients
Publisher: MDPI AG
Date: 05-11-2021
DOI: 10.3390/NANO11112977
Abstract: Dental implants are used broadly in dental clinics as the most natural-looking restoration option for replacing missing or highly diseased teeth. However, dental implant failure is a crucial issue for diabetic patients in need of dentition restoration, particularly when a lack of osseointegration and immunoregulatory incompetency occur during the healing phase, resulting in infection and fibrous encapsulation. Bio-inspired or biomimetic materials, which can mimic the characteristics of natural elements, are being investigated for use in the implant industry. This review discusses different biomimetic dental implants in terms of structural changes that enable antibacterial properties, drug delivery, immunomodulation, and osseointegration. We subsequently summarize the modification of dental implants for diabetes patients utilizing carbon nanomaterials, which have been recently found to improve the characteristics of biomimetic dental implants, including through antibacterial and anti-inflammatory capabilities, and by offering drug delivery properties that are essential for the success of dental implants.
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
Nitrogen, phosphorus co-doped holey rGO as a cathode material for Li-ion capacitors (LICs)
Publisher: Elsevier BV
Date: 12-2023
Back matter
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1NR90043A
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.
Supercapacitors: A new source of power for electric cars?
Publisher: Elsevier BV
Date: 03-2019
2D Supramolecular networks of dibenzonitrilediacetylene on Ag(111) stabilized by intermolecular hydrogen bonding
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CP01058C
Abstract: Hydrogen bonding controls the intermolecular distances in supramolecular networks – a platform to design molecular patterns at surfaces/interfaces.
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.
Pentacene on Ni(111): room-temperature molecular packing and temperature-activated conversion to graphene
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4NR07057G
Abstract: We investigate, by using scanning tunnelling microscopy, the adsorption of pentacene on Ni(111) at room temperature, and the on-surface conversion of these monolayer films to graphene at temperatures as low as 220 °C.
Unprecedented Transformation of Tetrathienoanthracene into Pentacene on Ni(111)
Publisher: American Chemical Society (ACS)
Date: 24-01-2013
DOI: 10.1021/NN305572S
Abstract: The imaging and characterization of single-molecule reaction events is essential to both extending our basic understanding of chemistry and applying this understanding to challenges at the frontiers of technology, for ex le, in nanoelectronics. Specifically, understanding the behavior of in idual molecules can elucidate processes critical to the controlled synthesis of materials for applications in multiple nanoscale technologies. Here, we report the synthesis of an important semiconducting organic molecule through an unprecedented reaction observed with submolecular resolution by scanning tunneling microscopy (STM) under ultrahigh vacuum (UHV) conditions. Our images reveal a sulfur abstraction and cyclization reaction that converts tetrathienoanthracene precursors into pentacene on the Ni(111) surface. The identity of the final reaction product was confirmed by time-of-flight secondary ion mass spectrometry (TOF-SIMS). This reaction has no known literature analogue, and highlights the power of local-probe techniques for exploring new chemical pathways.
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.
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
Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NJ01453A
Abstract: A newly reported alkylated naphthalene flanked DPP monomers without any further functionalization show high hole mobility in OFET devices.
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.
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.
Two linear beetle-type scanning tunneling microscopes
Publisher: AIP Publishing
Date: 26-03-2003
DOI: 10.1063/1.1544423
Abstract: Two beetle-type scanning tunneling microscopes are described. Both designs have the thermal stability of the Besocke beetle and the simplicity of the Wilms beetle. Moreover, s le holders were designed that also allow both semiconductor wafers and metal single crystals to be studied. The coarse approach is a linear motion of the beetle towards the s le using inertial slip–stick motion. Ten wires are required to control the position of the beetle and scanner and measure the tunneling current. The two beetles were built with different sized piezolegs, and the vibrational properties of both beetles were studied in detail. It was found, in agreement with previous work, that the beetle bending mode is the lowest principal eigenmode. However, in contrast to previous vibrational studies of beetle-type scanning tunneling microscopes, we found that the beetles did not have the “rattling” modes that are thought to arise from the beetle sliding or rocking between surface asperities on the raceway. The mass of our beetles is 3–4 times larger than the mass of beetles where rattling modes have been observed. We conjecture that the mass of our beetles is above a “critical beetle mass.” This is defined to be the beetle mass that attenuates the rattling modes by elastically deforming the contact region to the extent that the rattling modes cannot be identified as distinct modes in cross-coupling measurements.
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
Adsorption and Reactivity of Pyridine Dicarboxylic Acid on Cu(111)
Publisher: American Chemical Society (ACS)
Date: 31-07-2018
Reduced graphene oxide growth on 316L stainless steel for medical applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR02512A
Abstract: We describe a new method for the growth of reduced graphene oxide rGO on the 316L alloy of stainless steel 316L. Cell viability studies reveal that these rGO coatings do not have toxic effects on mammalian cells.
Power-to-decarbonization: Mesoporous carbon-MgO nanohybrid derived from plasma-activated seawater salt-loaded biomass for efficient CO2 capture
Publisher: Elsevier BV
Date: 11-2021
Substrate, Molecular Structure, and Solvent Effects in 2D Self-Assembly via Hydrogen and Halogen Bonding
Publisher: American Chemical Society (ACS)
Date: 27-10-2014
DOI: 10.1021/JP507729W
Graphene-based supercapacitor electrodes: Addressing challenges in mechanisms and materials
Publisher: Elsevier BV
Date: 06-2019
Effect of thermal annealing Super Yellow emissive layer on efficiency of OLEDs
Publisher: Springer Science and Business Media LLC
Date: 20-01-2017
DOI: 10.1038/SREP40805
Abstract: Thermal annealing of the emissive layer of an organic light emitting diode (OLED) is a common practice for solution processable emissive layers and reported annealing temperatures varies across a wide range of temperatures. We have investigated the influence of thermal annealing of the emissive layer at different temperatures on the performance of OLEDs. Solution processed polymer Super Yellow emissive layers were annealed at different temperatures and their performances were compared against OLEDs with a non-annealed emissive layer. We found a significant difference in the efficiency of OLEDs with different annealing temperatures. The external quantum efficiency (EQE) reached a maximum of 4.09% with the emissive layer annealed at 50 °C. The EQE dropped by ~35% (to 2.72%) for OLEDs with the emissive layers annealed at 200 °C. The observed performances of OLEDs were found to be closely related to thermal properties of polymer Super Yellow. The results reported here provide an important guideline for processing emissive layers and are significant for OLED and other organic electronics research communities.
Correction: Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8NJ90083C
Abstract: Correction for ‘Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors’ by Qian Liu et al. , New J. Chem. , 2018, 42 , 12374–12385.
Highly stable two-dimensional gold selenide with large in-plane anisotropy and ultrahigh carrier mobility
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9NH00586B
Abstract: Two separated Au channels for remarkably anisotropic transport and distribution of electrons and holes in 2D AuSe nanosheets for advanced polarization-sensitive optoelectronics.
Probing the Thermodynamics of Moiré Patterns in Molecular Self-Assembly at the Liquid–Solid Interface
Publisher: American Chemical Society (ACS)
Date: 17-02-2022
Advances in bismuth-telluride-based thermoelectric devices: Progress and challenges
Publisher: Elsevier BV
Date: 06-2023
Self‐Assembly of a Halogenated Molecule on Oxide‐Passivated Cu(110)
Publisher: Wiley
Date: 11-06-2013
Abstract: The supramolecular self-assembly of brominated molecules was investigated and compared on Cu(110) and Cu(110)-O(2×1) surfaces under ultrahigh vacuum. By using scanning tunnelling microscopy, we show that brominated molecules form a disordered structure on Cu(110), whereas a well-ordered supramolecular network is observed on the Cu(110)-O(2×1) surface. The different adsorption behaviors of these two surfaces are described in terms of weakened molecule-substrate interactions on Cu(110)-O(2×1) as opposed to bare Cu(110). The effect of oxygen-passivation is to suppress debromination and it can be a convenient approach for investigating other self-assembly processes on copper-based substrates.
Nanolines on silicon surfaces
Publisher: Inderscience Publishers
Date: 2008
Periodic and nonperiodic chiral self-assembled networks from 1,3,5-benzenetricarboxylic acid on Ag(111).
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CC04380A
Abstract: Surface-catalyzed reactions provide a versatile route to synthesizing new 2D materials. Here, we show that the statistical nature of an activated reaction can lead to a ersity of intermolecular bonding motifs through partially-reacted molecules. With increasing annealing, we observe different periodic, well-defined phases of 1,3,5-benzenetricarboxylic acid on Ag(111), where the surface structure in each case is defined by the degree of deprotonation of the carboxylic groups. Over a wide range of deprotonation levels (∼50% to near 100%), we observe a granular alloy comprising two distinct phases in a continuous network. This ordered phase lacks well-defined translational symmetry, is stabilized through both intermolecular interactions and epitaxy, and demonstrates a design approach to creating non-crystalline phases by capitalizing on the chemical ersity of partially reacted molecules on a surface.
Shape transition in very large germanium islands on Si(111)
Publisher: AIP Publishing
Date: 09-03-2009
DOI: 10.1063/1.3093674
Abstract: Ge islands with areas up to hundreds of μm2 were grown on Si(111). These islands, grown above 750 °C and at a deposition rate of 1 monolayer/min, become decreasingly compact with increasing size and can have nonuniform cross sections with heights reaching over 500 nm. The largest islands are ramified, often comprising multiple discrete parts. X-ray photoemission electron microscopy absorption maps show that the islands have a higher concentration of Ge at their centers, with more Si near the edges. We propose that the shape transformation is driven by strain relief at the island perimeters.
Film formation from plasma-enabled surface-catalyzed dehalogenative coupling of a small organic molecule
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8RA08920E
Abstract: New surface coating pathway by plasma-enabled surface-catalyzed reaction, offering control of surface chemistry, wettability and roughness.
Detection of a Fermi-level crossing in Si(557)-Au with inverse photoemission
Publisher: American Physical Society (APS)
Date: 19-06-2006
Cleaning up after the Party: Removing the Byproducts of On-Surface Ullmann Coupling.
Publisher: American Chemical Society (ACS)
Date: 10-07-2019
Abstract: Ullmann coupling is one of the most frequently employed methodologies for producing π-conjugated surface-confined polymers. One unfortunate side product of the reaction is the creation of metal halide islands formed from liberated halogen atoms. Following the coupling reaction, these halide islands can account for a large proportion of the substrate surface area and thus inhibit domain growth and effectively poison the catalyst. Here, we describe an efficient and reliable methodology for removing the halogen byproduct at room temperature by exposure to a beam of atomic hydrogen this action removes the halogen atoms in a matter of minutes, with minimal impact to the polymer structure. We also find that it is possible under certain circumstances to preserve the pre-exposure epitaxy after removal of the halogen. This finding provides a convenient and straightforward technique for addressing the most often-cited drawback of the on-surface Ullman coupling methodology and provides access to a previously inaccessible parameter space for these types of experiments.
Effect of hydrodynamics and surface roughness on the electrochemical behaviour of carbon steel in CSG produced water
Publisher: Elsevier BV
Date: 12-2015
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.
1D Coordination Polymers of 1,1′-Dibromoferrocene Following Debromination on Ag(111)
Publisher: American Chemical Society (ACS)
Date: 07-06-2022
Self-assembly of indole-2-carboxylic acid at graphite and gold surfaces
Publisher: AIP Publishing
Date: 24-02-2015
DOI: 10.1063/1.4908143
Abstract: Model systems are critical to our understanding of self-assembly processes. As such, we have studied the surface self-assembly of a small and simple molecule, indole-2-carboxylic acid (I2CA). We combine density functional theory gas-phase (DFT) calculations with scanning tunneling microscopy to reveal details of I2CA assembly in two different solvents at the solution/solid interface, and on Au(111) in ultrahigh vacuum (UHV). In UHV and at the trichlorobenzene/highly oriented pyrolytic graphite (HOPG) interface, I2CA forms epitaxial lamellar structures based on cyclic OH⋯O carboxylic dimers. The structure formed at the heptanoic acid/HOPG interface is different and can be interpreted in a model where heptanoic acid molecules co-adsorb on the substrate with the I2CA, forming a bicomponent commensurate unit cell. DFT calculations of dimer energetics elucidate the basic building blocks of these structures, whereas calculations of periodic two-dimensional assemblies reveal the epitaxial effects introduced by the different substrates.
Multistimulus-Responsive Graphene Oxide/Fe3O4/Starch Soft Actuators
Publisher: American Chemical Society (ACS)
Date: 04-2022
Abstract: Soft actuators that respond to external stimuli like moisture, magnetism, light, and temperature have received tremendous attention owing to their promising potential in many frontier applications, including smart switches, soft robots, sensors, and artificial muscles. However, most of the conventional actuators can only be triggered by a solo stimulus and demand advanced manufacturing techniques that utilize expensive, hazardous, and synthetic raw materials. Herein, we design and fabricate a multiple stimuli-responsive actuator using graphene oxide, Fe
Preparation of bioinspired graphene oxide/PMMA nanocomposite with improved mechanical properties
Publisher: Elsevier BV
Date: 11-2021
Light-Gated Control of Conformational Changes in Polymer Brushes
Publisher: Wiley
Date: 10-07-2022
Abstract: Herein, a strategy to control conformational changes in grafted polymer brushes via photoinduced crosslinking of photoreactive groups embedded into the lateral architecture of a polymer brush is reported. Poly(methylmethacrylate)‐based polymer brushes containing UV‐light (λ = 325 nm) photoreactive o ‐methyl benzaldehyde moieties are synthesized using surface‐initiated reversible deactivation polymerization. The conformational changes in polymer brushes upon UV‐light triggered crosslinking are comprehensively analyzed through a full suite of surface sensitive characterization methods including time of flight secondary ion mass spectrometry, quartz crystal microbalance with dissipation monitoring, UV/vis spectroscopy, atomic force microscopy, nanoplasmonic sensing, and neutron reflectometry. The spatiotemporal control of the induced conformational changes is demonstrated via photolithography experiments. To enable an additional level of control, a second gate, the visible light (λ = 445 nm) active styrylpyrene moiety, is incorporated into the polymer brush architecture. Critically, wavelength‐selective crosslinking behavior is observed in the diblock copolymer structures allowing to crosslink specific sections of the lateral brush architecture as a function of irradiation wavelength.
Effect of Dissolved Oxygen and Immersion Time on the Corrosion Behaviour of Mild Steel in Bicarbonate/Chloride Solution
Publisher: MDPI AG
Date: 09-2016
DOI: 10.3390/MA9090748
Innovations in nanosynthesis: emerging techniques for precision, scalability, and spatial control in reactions of organic molecules on solid surfaces
Publisher: IOP Publishing
Date: 06-03-2023
Abstract: The surface science-based approach to synthesising new organic materials on surfaces has gained considerable attention in recent years, owing to its success in facilitating the formation of novel 0D, 1D and 2D architectures. The primary mechanism used to date has been the catalytic transformation of small organic molecules through substrate-enabled reactions. In this Topical Review, we provide an overview of alternate approaches to controlling molecular reactions on surfaces. These approaches include light, electron and ion-initiated reactions, electrospray ionisation deposition-based techniques, collisions of neutral atoms and molecules, and superhydrogenation. We focus on the opportunities afforded by these alternative approaches, in particular where they may offer advantages in terms of selectivity, spatial control or scalability.
With great structure comes great functionality: Understanding and emulating spider silk
Publisher: Springer Science and Business Media LLC
Date: 18-12-2014
DOI: 10.1557/JMR.2014.365
Tailoring the Reaction Path in the On-Surface Chemistry of Thienoacenes
Publisher: American Chemical Society (ACS)
Date: 09-09-2015
Versatile, Rapid, and Plasma-Assisted Synthesis of Cuprous Halide Composites at Room Temperature and Pressure
Publisher: Wiley
Date: 16-07-2021
Abstract: Cuprous halides (CuX) are transparent semiconductors with a range of appealing characteristics, and with targeted applications in electronics, energy storage, and sensing. Here, it is demonstrated that CuX films can be formed at room temperature and atmospheric pressure using a rapid, plasma‐based approach. Crystalline CuX products are formed using dielectric barrier discharge plasma to react liquid small‐molecule precursors (1,2‐dichloro‐4‐X‐benzene, where X = Cl, Br, and I) with a copper substrate via a plasma‐assisted reaction. This process produces a composite film, containing both an organic polymer and the cuprous halide crystallites, with a hierarchical nanostructure. The cuprous halides have the zincblende structure, with sizes ranging from ≈10 to ≈85 nm. By employing either neat or mixed precursors, products including CuCl, CuBr, CuCl 0.1 I 0.9 , and CuBr 0.5 I 0.5 are accessed. Furthermore, the same process can be used to produce AgI films from the iodated precursor molecule on a silver film, demonstrating the remarkable versatility of this approach. This work reveals a flexible new method to produce these technologically relevant I–VII semiconductor films, which can have applications in sensing, batteries, or photovoltaics.
Rattling modes and the intrinsic vibrational spectrum of beetle-type scanning tunneling microscopes
Publisher: Elsevier BV
Date: 12-2003
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