ORCID Profile
0000-0002-6434-1643
Current Organisation
The University of Sydney Library
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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)
Nanoscale Characterisation | Nanotechnology | Nanotechnology | Materials Engineering | Photodetectors, Optical Sensors and Solar Cells | Polymers and Plastics | Metals and Alloy Materials | Composite and Hybrid Materials | Condensed Matter Physics—Other | Nanophotonics | Nanomaterials | Materials Engineering Not Elsewhere Classified | Nanofabrication, Growth and Self Assembly | Renewable Power and Energy Systems Engineering (excl. Solar Cells) | Mineralogy and Crystallography | Biochemistry and Cell Biology | Colloid And Surface Chemistry | Zoology | Composite Materials | Pharmaceutical Sciences | Structural Biology (incl. Macromolecular Modelling) | Condensed Matter Physics not elsewhere classified | Functional Materials | Compound Semiconductors | Animal Anatomy And Histology | Biomaterials | Biomaterials | Sensor (Chemical And Bio-) Technology | Physical Chemistry (Incl. Structural) | Electrical and Electronic Engineering | Sustainable Agricultural Development | Dental Materials and Equipment | Pharmacology and Pharmaceutical Sciences not elsewhere classified | Plasma Physics; Fusion Plasmas; Electrical Discharges
ANZSRC Socio-Economic Objective (SEO)
Physical sciences | Energy Storage (excl. Hydrogen) | Solar-Photovoltaic Energy | Expanding Knowledge in Engineering | Management of Solid Waste from Energy Activities | Precious metals (e.g. refined bullion, wire and strip) | Satellite Navigation Equipment | Respiratory System and Diseases (incl. Asthma) | Neurodegenerative Disorders Related to Ageing | Rehabilitation of degraded farmland | Ground transport | Concentrating processes of other base metal ores | Fabricated metal products not elsewhere classified | Endocrine Organs and Diseases (excl. Diabetes) | Cancer and Related Disorders | Prevention—biologicals (e.g. vaccines) | Treatments (e.g. chemicals, antibiotics) | Hearing, Vision, Speech and Their Disorders | Plastic products (incl. Construction materials) | Energy transformation | Structural metal products | Other | Diagnostic methods | Expanding Knowledge in Technology | Solar-Thermal Electric Energy | Plastic Products (incl. Construction Materials) | Aerospace Equipment | Expanding Knowledge in the Earth Sciences | Nautical Equipment (excl. Yachts) | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in the Biological Sciences | Transport equipment |
Related Links
Publications
Observation of Robust Interlayer Biexcitons in Twisted Homobilayer Superlattices
Publisher: Research Square Platform LLC
Date: 15-05-2023
DOI: 10.21203/RS.3.RS-2774598/V1
Abstract: Moiré superlattices are formed by stacking 2D materials with a twist angle and have recently gained attention as a platform for investigating the interactions and correlations of moiré-trapped interlayer excitons (IXs). However, understanding these excitons remains challenging, as theoretical predictions suggest the existence of both parallel and antiparallel dipole-dipole interactions, while only repulsive interactions with a parallel configuration have been experimentally observed. Here, we investigate the localization of strain-induced moiré interlayer excitons in twisted transition metal dichalcogenide (TMDC) superlattices. Our results reveal that modulating the moiré trap in strain-engineered homobilayers leads to a higher density and emission efficiency of IXs, while also enhancing dipole-dipole interactions. In particular, we observe a transition in the nature of the moiré interlayer exciton-dipole interaction from repulsion to attraction in a twist-angle homostructure, resulting in a stable interlayer biexciton (IXX) phase with an antiparallel configuration, which had only been theoretically predicted before. Moreover, the moiré trap in homobilayers can be modulated by adjusting the spacing of the Au nanoarrays, which enabled us to achieve IXX emission up to 150 K, the highest temperature reported to date. This breakthrough is expected to pave the way for the observation of a Bose-Einstein condensate at room temperature. Our findings provide new opportunities for studying correlated many-body systems and have implications for developing novel optoelectronic devices and controllable nonlinear optics.
HRTEM study of orthorhombic zirconia in MgO-PSZ
Publisher: International Union of Crystallography (IUCr)
Date: 19-07-2003
DOI: 10.1107/S0021889803009075
Abstract: High-resolution transmission electron microscopy (HRTEM) was used to study the phase of orthorhombic ZrO 2 formed in magnesia partially stabilized zirconia (MgO-PSZ) during HRTEM specimen preparation. Based on the three reported crystal structures of orthorhombic ZrO 2 , with the space groups Pbcm , Pbc 2 1 and Pbca , here it is shown that orthorhombic ZrO 2 formed in MgO-PSZ has the Pbcm structure.
Laser cladding Al-based amorphous-nanocrystalline composite coatings on AZ80 magnesium alloy under water cooling condition
Publisher: Elsevier BV
Date: 2017
Epitaxial heterostructures: Side-to-side Si-Zns, Si-ZnSe biaxial nanowires, and sandwichlike Zns-Si-Zns triaxial nanowires
Publisher: American Chemical Society (ACS)
Date: 22-08-2003
DOI: 10.1021/JA030235L
Abstract: Epitaxial semiconducting heterostructures: side-to-side Si-ZnS, Si-ZnSe biaxial nanowires, and sandwichlike ZnS-Si-ZnS triaxial nanowires were grown via a simple two-stage thermal evaporation of mixed SiO and ZnS or SiO and ZnSe powders under a precise temperature control. Each nanowire had a uniform diameter of 40-120 nm and length ranging from several to several tens of micrometers. Subnanowires of Si, ZnS, and ZnSe within them had a diameter of 20-50, 40-60, and 20-50 nm, respectively. The optical property (nanoscale cathodoluminescence) was also investigated from these new structures. It is proposed that the Si nanowires formed through disproportionation of SiO to Si in the first evaporation stage and then served as one-dimensional nanoscale substrates (or templates) for an epitaxial growth of ZnS or ZnSe nanowires in the following thermal evaporation of ZnS or ZnSe powders. The present results suggest that the simple method might be useful for the synthesis of many other heterostructures containing Si and II-VI or III-V semiconducting composite nanowires to meet the growing demands of nanoscale science and technology.
THE BEHAVIOR OF GALLIUM CONFINED IN CARBON NANOTUBES DURING HEATING AND COOLING
Publisher: World Scientific Pub Co Pte Lt
Date: 06-2008
DOI: 10.1142/S1793604708000101
Abstract: The thermal expansion of gallium ( Ga ) encapsulated in carbon nanotubes has been studied. It is demonstrated that the volumetric expansion and contraction of the Ga confined in the carbon nanotubes display a linear relationship with temperature. While the level of the tip of the Ga column changes linearly with temperature, it returns to its previous position, without any hysteresis, when reheated or cooled to the original temperature, provided the Ga has not frozen and electron-beam irradiation is minimized. It is shown that electron beam irradiation can cause shrinkage in carbon-nanotube diameter, and that a high-intensity electron beam can also induce the formation of new carbon shells inside the carbon nanotubes. Upon freezing, the solid Ga has two unique orientation relationships with the carbon nanotubes.
Enhancement of diatomite solid acidity by Al incorporation, as evaluated by the catalytic effects on the thermal decomposition of 12-aminolauric acid
Publisher: Elsevier BV
Date: 11-2016
Fabrication and characterization of in-situ duplex plasma-treated nanocrystalline Ti/AlTiN coatings
Publisher: Elsevier BV
Date: 07-2016
Field-emission cascades prepared by boron nitride cluster beam deposition
Publisher: American Vacuum Society
Date: 05-2008
DOI: 10.1116/1.2912084
Abstract: Boron nitride nanogranular films on n-type silicon substrates were prepared and their field-emission performance was tested. The films started their electron emission at a mean electric field of 4.0 V/μm. The current density reached 1 mA/cm2 at 6.2 V/μm. The Fowler-Nordheim plot gave an enhancement factor β of 360. The films were boron-rich. As measured by scanning electron microscopy and atomic force microscopy, the films contained the cone-shaped islands with the diameter of 20–40 nm, which were believed to enhance the local electric field. Their performance parameters were comparable to the values of the s les with micrometer roughness.
Vanadium doped Cd0.9Mn0.1Te crystal and its optical and electronic properties
Publisher: Elsevier BV
Date: 02-2017
Synergistic Effect for LiMn2O4Microcubes with Enhanced Rate Capability and Excellent Cycle Stability for Lithium Ion Batteries
Publisher: The Electrochemical Society
Date: 14-11-2015
DOI: 10.1149/2.0491602JES
Effects of trace Cu addition on the microstructure and tensile properties of ZK60 alloy
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.655
Abstract: ZK60 alloy is one of the most important commercial wrought magnesium alloys. However, it suffers from several deficiencies like severe hot crack tendency and relatively low mechanical properties as compared to aluminum alloys. In this discussion, the microstructures of a ZK60-(0, 0.5 Cu, wt.%) alloy at different heat treatment states were examined by various techniques including optical microscopy (OM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The corresponding room temperature tensile properties of the alloys were also tested. The results indicate that trace Cu addition could dramatically improve the casting properties and tensile performance of the ZK60 alloy. In the peak-aged condition, for ex le, the ultimate tensile strength and relative elongation were 261.4 MPa and 17.51% for the current ZK60-0.5Cu alloy, in contrast to 222.9 MPa and 5.97% for the ZK60 alloy, respectively. The improvements could be mainly attributed to the elevated number density and refinement of the dominant strengthening phase β1΄, together with the presence of C15 Laves phase MgZnCu formed in the ZK60-0.5Cu alloy. In addition, no appreciable change in yield strength was observed.
Spontaneous pneumothoraces in hereditary multiple exostoses
Publisher: BMJ
Date: 07-03-2013
Dye-sensitized solar cells based on indium-tin oxide nanowires coated with titania layers
Publisher: IEEE
Date: 07-2008
Electrodeposited PEDOT films on ITO with a flower-like hierarchical structure
Publisher: Elsevier BV
Date: 08-2010
Graphene-based surface modification on layered Li-rich cathode for high-performance Li-ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11580A
A combined study by XRD, FTIR, TG and HRTEM on the structure of delaminated Fe-intercalated/pillared clay
Publisher: Elsevier BV
Date: 08-2008
DOI: 10.1016/J.JCIS.2008.04.076
Abstract: Fe-PILC s les were synthesized by the reaction between Na(+)- and/or Ca(2+)-montmorillonite (Mt) and base-hydrolyzed solutions of Fe(III) nitrate. Different from the known usual microporous pillared structure, a meso-microporous delaminated structure containing intercalated or pillared fragments was found in the respective resulting Fe-intercalated or -pillared clays. XRD patterns of Na(+)-Mt-based Fe-intercalated illared clays show one large d-spacing above 6.4 nm corresponding to the mesoporous delaminated part, whereas another d-spacing of ca. 1.5 nm was indicative of the microporous pillared part. Fe-intercalated illared clays based on Ca(2+)-Mt lead to similar results, but with a d-spacing less than 6 nm and a second low intense d-spacing less than 1.5 nm. In the delaminated Fe-intercalated clays, NO(-)(3) anions were retained even after thorough washing process. They play as counterions to neutralize the positive-charged iron aggregates in the delaminated structure, and can be exchanged by heteropolyanions as [PW(12)O(40)](3-). The delaminated Fe-pillared clays show good thermal stability at 500 degrees C and exhibit at this temperature dramatically higher specific surface area and porosity than the starting montmorillonites. However, calcination at a higher temperature leads to the formation of nanocrystalline hematite. Air-drying after ethanol extraction (EAD) method has an advantage over air-drying (AD) method in preserving the delaminated structure.
On the morphology and crystallography of Hg5In2Te8 precipitation in Hg3In2Te6
Publisher: Elsevier BV
Date: 07-2014
A phosphorus and carbon composite containing nanocrystalline Sb as a stable and high-capacity anode for sodium ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9TA07508A
Abstract: Sodium ion batteries are a potential alternative to lithium ion batteries due to the low cost and natural abundance of sodium.
Microstructural evolution of spinodally formed Fe35 Ni15 Mn25 Al25
Publisher: Elsevier BV
Date: 11-2009
Three-dimensional electrodes for dye-sensitized solar cells: synthesis of indium–tin-oxide nanowire arrays and ITO/TiO2core–shell nanowire arrays by electrophoretic deposition
Publisher: IOP Publishing
Date: 12-01-2009
DOI: 10.1088/0957-4484/20/5/055601
Abstract: Dye-sensitized solar cells (DSSCs) show promise as a cheaper alternative to silicon-based photovoltaics for specialized applications, provided conversion efficiency can be maximized and production costs minimized. This study demonstrates that arrays of nanowires can be formed by wet-chemical methods for use as three-dimensional (3D) electrodes in DSSCs, thereby improving photoelectric conversion efficiency. Two approaches were employed to create the arrays of ITO (indium-tin-oxide) nanowires or arrays of ITO/TiO(2) core-shell nanowires both methods were based on electrophoretic deposition (EPD) within a polycarbonate template. The 3D electrodes for solar cells were constructed by using a doctor-blade for coating TiO(2) layers onto the ITO or ITO/TiO(2) nanowire arrays. A photoelectric conversion efficiency as high as 4.3% was achieved in the DSSCs made from ITO nanowires this performance was better than that of ITO/TiO(2) core-shell nanowires or pristine TiO(2) films. Cyclic voltammetry confirmed that the reaction current was significantly enhanced when a 3D ITO-nanowire electrode was used. Better separation of charge carriers and improved charge transport, due to the enlarged interfacial area, are thought to be the major advantages of using 3D nanowire electrodes for the optimization of DSSCs.
Optical and magnetic properties of Cu-doped 13-atom Ag nanoclusters
Publisher: Elsevier BV
Date: 07-2013
Self-Assembly of Gold Nanowires along Carbon Nanotubes for Ultrahigh-Aspect-Ratio Hybrids
Publisher: American Chemical Society (ACS)
Date: 04-05-2011
DOI: 10.1021/CM1033645
Progress and challenges of carbon nanotube membrane in water treatment
Publisher: Informa UK Limited
Date: 24-05-2016
Fabrication of metal-semiconductor nanowire heterojunctions
Publisher: Wiley
Date: 22-03-2005
Synthesis, mechanical and electrical properties of carbon microcoils and nanocoils
Publisher: World Scientific Pub Co Pte Lt
Date: 12-2010
DOI: 10.1142/S179360471000138X
Abstract: The results on the synthesis, mechanical and electrical properties of carbon microcoils and nanocoils (CMCs, CNCs) synthesized using catalytic CVD and Ni–P and Co–P catalyst alloys, respectively, are reported. SEM analysis reveals that the CMCs and CNCs have unique helical morphologies, and diameters of 5.0–9.0 μm and 450–550 nm, respectively. Moreover, CMCs with flat cross-section can be stretched to 3 times their original coil lengths. Current–voltage characteristics of a single microcoil have also been obtained. It is found that the CMCs have the electrical conductivity between 100 and 160 S/cm, whereas the electrical resistance increases by about 20% during the coil extension. Besides, the microcoils can produce light in vacuum when the test voltage reaches 10 V. The emission intensity increases as the voltage increases. The mechanical and electrical properties of CMCs and CNC make them potentially useful in many applications in micromagnetic sensors, mechanical microsprings and optoelectronics.
Analysis of the Promoted Activity and Molecular Mechanism of Hydrogen Production over Fine Au-Pt Alloyed TiO2 Photocatalysts
Publisher: American Chemical Society (ACS)
Date: 06-2015
Selective Oxidation Synthesis of MnCr2O4 Spinel Nanowires from Commercial Stainless Steel Foil
Publisher: American Chemical Society (ACS)
Date: 18-10-2007
DOI: 10.1021/CG070514A
Tuning the Synthesis of Manganese Oxides Nanoparticles for Efficient Oxidation of Benzyl Alcohol
Publisher: Springer Science and Business Media LLC
Date: 06-01-2017
Automated process flowsheet synthesis for membrane processes using genetic algorithm: role of crossover operators
Publisher: Elsevier
Date: 2016
Atomic-scale regulation of anionic and cationic migration in alkali metal batteries
Publisher: Springer Science and Business Media LLC
Date: 07-07-2021
DOI: 10.1038/S41467-021-24399-9
Abstract: The regulation of anions and cations at the atomic scale is of great significance in membrane-based separation technologies. Ionic transport regulation techniques could also play a crucial role in developing high-performance alkali metal batteries such as alkali metal-sulfur and alkali metal-selenium batteries, which suffer from the non-uniform transport of alkali metal ions (e.g., Li + or Na + ) and detrimental shuttling effect of polysulfide olyselenide anions. These drawbacks could cause unfavourable growth of alkali metal depositions at the metal electrode and irreversible consumption of cathode active materials, leading to capacity decay and short cycling life. Herein, we propose the use of a polypropylene separator coated with negatively charged Ti 0.87 O 2 nanosheets with Ti atomic vacancies to tackle these issues. In particular, we demonstrate that the electrostatic interactions between the negatively charged Ti 0.87 O 2 nanosheets and polysulfide olyselenide anions reduce the shuttling effect. Moreover, the Ti 0.87 O 2 -coated separator regulates the migration of alkali ions ensuring a homogeneous ion flux and the Ti vacancies, acting as sub-nanometric pores, promote fast alkali-ion diffusion.
Protein fouling in carbon nanotubes enhanced ultrafiltration membrane: Fouling mechanism as a function of pH and ionic strength
Publisher: Elsevier BV
Date: 04-2017
Ag-Cu nanoalloyed film as a high-performance cathode electrocatalytic material for zinc-air battery
Publisher: Springer Science and Business Media LLC
Date: 23-04-2015
DOI: 10.1186/S11671-015-0900-9
Abstract: A novel Ag 50 Cu 50 film electrocatalyst for oxygen reduction reaction (ORR) was prepared by pulsed laser deposition (PLD) method. The electrocatalyst actually is Ag-Cu alloyed nanoparticles embedded in amorphous Cu film, based on transmission electron microscopy (TEM) characterization. The rotating disk electrode (RDE) measurements provide evidence that the ORR proceed via a four-electron pathway on the electrocatalysts in alkaline solution. And it is much more efficient than pure Ag catalyst. The catalytic layer has maximum power density of 67 mW cm −2 and an acceptable cell voltage at 0.863 V when current densities increased up to 100 mA cm −2 in the Ag 50 Cu 50 -based primary zinc-air battery. The resulting rechargeable zinc-air battery exhibits low charge-discharge voltage polarization of 1.1 V at 20 mAcm −2 and high durability over 100 cycles in natural air.
Raman scattering study on Sb spray InAs/GaAs quantum dot nanostructure systems
Publisher: Springer Science and Business Media LLC
Date: 29-04-2015
Effects of microstructure of clay minerals, montmorillonite, kaolinite and halloysite, on their benzene adsorption behaviors
Publisher: Elsevier BV
Date: 07-2017
One‐Step Room‐Temperature Synthesis of [Al]MCM‐41 Materials for the Catalytic Conversion of Phenylglyoxal to Ethylmandelate
Publisher: Wiley
Date: 09-09-2013
Influence of support acidity on the performance of size-confined Pt nanoparticles in the chemoselective hydrogenation of acetophenone
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CY00214A
Abstract: Chemoselectivity of hydrogenation depends on strength of the covered BAS, whereas the free BAS enhance the rate.
Cyclic Performance of Waste-Derived SiO2 Stabilized, CaO-Based Sorbents for Fast CO2 Capture
Publisher: American Chemical Society (ACS)
Date: 17-10-2016
Advances in Sustain Stable Voltage of Cr-Doped Li-Rich Layered Cathodes for Lithium Ion Batteries
Publisher: The Electrochemical Society
Date: 2014
DOI: 10.1149/2.0461410JES
Single crystal forms induced diverse interface structures in TiO2 (B)/anatase dual-phase nanocomposites
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CE02411K
Abstract: Two types of TiO 2 (B) single crystal forms (SCF) and the induced TiO 2 (B)/anatase interfaces with different orientation relationships are investigated by TEM. The dominated (001} SCF is confirmed to reveal larger nanotunnels at the interface which suggests an enhanced Li + transport properties.
Enhancement of the catalytic performance of a CNT supported Pt nanorod cluster catalyst by controlling their microstructure
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA13373D
Abstract: Novel catalysts with Pt nanorod clusters distributed in both interior and exterior of CNTs were prepared and confirmed by TEM tomography. This structure benefits higher performance due to the CNTs' confinement effect.
The crystallography of C-centred monoclinic to body-centred tetragonal polymorphic phase transformation in mixed-phase TiO 2 (B) and anatase nanocomposite
Publisher: Elsevier BV
Date: 07-2016
LiMn2O4 cathode materials with large porous structure and radial interior channels for lithium ion batteries
Publisher: Elsevier BV
Date: 09-2016
Graphene-V 2O 5·nH 2O xerogel composite cathodes for lithium ion batteries
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1RA00258A
Visualizing plasmon coupling in closely spaced chains of Ag nanoparticles by electron energy-loss spectroscopy
Publisher: Wiley
Date: 27-01-2010
Abstract: Anisotropic plasmon coupling in closely spaced chains of Ag nanoparticles is visualized using electron energy-loss spectroscopy in a scanning transmission electron microscope. For dimers as the simplest chain, mapping the plasmon excitations with nanometer spatial resolution and an energy resolution of 0.27 eV intuitively identifies two coupling plasmons. The in-phase mode redshifts from the ultraviolet region as the interparticle spacing is reduced, reaching the visible range at 2.7 eV. Calculations based on the discrete-dipole approximation confirm its optical activeness, where the longitudinal direction is constructed as the path for light transportation. Two coupling paths are then observed in an inflexed four-particle chain.
In situ observation and investigation on the formation mechanism of nanocavities in TiO2nanofibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CE01220E
On the understanding of the microscopic origin of the properties of diluted magnetic semiconductors by atom probe tomography
Publisher: Elsevier BV
Date: 04-2009
Temperature measurement using a gallium-filled carbon nanotube nanothermometer
Publisher: AIP Publishing
Date: 30-09-2003
DOI: 10.1063/1.1616201
Abstract: We report here temperature measurement by means of a Ga-filled C nanotube thermometer with diameter & nm and length ∼12 μm. The method relies on the initial identification and calibration of a nanothermometer in a transmission electron microscope (TEM), followed by placing it into an air-filled furnace whose temperature is to be measured, and final TEM reading of a postmeasurement gradation mark visible inside the tubular channel. The mark originates from the fact that, at high temperature, the Ga column tip exposed to the air through the open C nanotube end oxidizes, and a thin Ga oxide layer sticks to the nanotube walls upon cooling. The temperature according to this gradation mark coincides closely with nominal furnace temperature controlled by standard means. The method paves the way for practical temperature measurements using a C nanothermometer in air and within spatially localized regions (e.g., dimensions of tens of micrometers).
The first template-free growth of crystalline silicon microtubes
Publisher: Wiley
Date: 06-2004
Evidence for room temperature ferromagnetism in the In1−xCrxN system
Publisher: Elsevier BV
Date: 06-2006
Solid phase mechanochemical synthesis of polyaniline branched nanofibers
Publisher: Elsevier BV
Date: 07-2009
Electro-synthesis of novel nanostructured PEDOT films and their application as catalyst support
Publisher: Springer Science and Business Media LLC
Date: 27-04-2011
Abstract: Poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with nitric and chlorine ions have been electrochemically deposited simply by a one-step electrochemical method in an aqueous media in the absence of any surfactant. The fabricated PEDOT films were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The results indicate that the hierarchical structured PEDOT film doped with nitric ions displays a 'lunar craters' porous morphology consisting of PEDOT nano-sheets with a thickness of less than 2 nm. The effect of counter ions on the electro-polymerization, the electrochemistry, and the morphology of the polymer film was studied. Compared with PEDOT film doped with nitric acid, PEDOT film deposited in the presence of chlorine ions shows irregular morphology and less electrochemical activity. The specific nanostructure of the polymer was further studied as catalyst support for platinum nanoparticles to methanol electro-oxidation.
High rate capability caused by surface cubic spinels in Li-rich layer-structured cathodes for Li-ion batteries
Publisher: Springer Science and Business Media LLC
Date: 31-10-2013
DOI: 10.1038/SREP03094
Abstract: Modified Li-rich layered cathode Li(Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 )O 2 has been synthesized by a simple strategy of using surface treatment with various amounts (0–30 wt.%) of Super P (carbon black). Based on detailed characterizations from X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS), it is suggested that the phase transformation from Li 2 MnO 3 -type of structure to spinel-like phase take place at the surface regions of particles during post annealing process at 350°C, leading to increase in both first coulombic efficiency and rate capability, from 78% and 100 mAh·g −1 (charge capacity at 2500 mA·g −1 ) of the pristine material to 93.4% and 200 mAh·g −1 . The evidences of spinel formation and the reasons for electrochemical enhancement are systematically investigated.
Observation of optical anisotropy and a linear dichroism transition in layered silicon phosphide
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3NR01765F
Abstract: Raman polarization spectra, temperature-dependent photoluminescence (PL), and anisotropic absorption with a linear dichroism transition were studied to gain insights into the physical properties of SiP materials.
Calibrating the atomic balance by carbon nanoclusters
Publisher: AIP Publishing
Date: 18-01-2010
DOI: 10.1063/1.3284498
Abstract: Carbon atoms are counted at near atomic-level precision using a scanning transmission electron microscope calibrated by carbon nanocluster mass standards. A linear calibration curve governs the working zone from a few carbon atoms up to 34 000 atoms. This linearity enables adequate averaging of the scattering cross sections, imparting the experiment with near atomic-level precision despite the use of a coarse mass reference. An ex le of this approach is provided for layer counting of stacked graphene sheets. Suspended graphene sheets with a size below 100 nm are visualized, providing quantitative measurement in a regime inaccessible to optical and scanning probe methods.
Synthesis and structure of InP nanowires and nanotubes
Publisher: Elsevier BV
Date: 07-2003
Highly effective metal vapor absorbents based on carbon nanotubes
Publisher: AIP Publishing
Date: 09-12-2002
DOI: 10.1063/1.1530740
Abstract: It was shown that, when filled with gallium, carbon nanotubes can absorb copper vapor with extraordinarily high efficiency. The copper vapor generated from the supporting copper grid upon heating to 800 °C in an electron microscope under a pressure of 1.0×10−5 Pa quickly deposited into the carbon nanotubes and formed an alloy with gallium where the vapor pressure is up to 500 times higher (5×10−3 Pa). These filled carbon nanotubes may be used as highly sensitive toxic or radioactive metal vapor absorbents since gallium also tends to form alloys with metals like mercury and uranium.
Modelling and sequential simulation of multi-tubular metallic membrane and techno-economics of a hydrogen production process employing thin-layer membrane reactor
Publisher: Elsevier BV
Date: 11-2016
Uniform and high-quality submicrometer tubes of GaS layered crystals
Publisher: AIP Publishing
Date: 07-10-2005
DOI: 10.1063/1.2093924
Abstract: GaS, group III–VI semiconductor compound, is known to possess a layered structure. In this letter, uniform and high-quality GaS submicrometer tubes have been synthesized via a simple high-temperature thermal reaction route. Each GaS tube is uniform in size, and has length up to tens of microns and outer diameter of ∼200–900nm some of the tubes are partially filled with liquid metallic Ga “rods.” Photoluminescence spectrum reveals that the GaS tubes have two strong emission bands centered at ∼585 and ∼615nm. Possible reaction processes and a rolling-up growth mechanism of as-grown GaS tubes were briefly discussed.
Stabilization of NaZn(BH4)3via nanoconfinement in SBA-15 towards enhanced hydrogen release
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2TA00195K
People at a persistent pain service can walk it, but some struggle to talk about it: Reliability, detectable difference and clinically important difference of the six‐minute walk test
Publisher: Wiley
Date: 05-09-2022
DOI: 10.1002/MSC.1687
Abstract: The six‐minute walk test (6MWT) is a commonly used measure of functional capacity. This study is the first to investigate the test‐retest reliability, minimal detectable difference (MDD) and the minimal clinically important difference (MCID) for people attending a persistent pain service. Relationships between change in 6MWT performance and change in self‐reported physical, functional and psychological outcome measures were also explored. A cross‐sectional repeated measures design was used with people having months of pain attending an 8‐week outpatient persistent pain programme. For reliability and MDD, 27 people were recruited, for MCID calculations, 32 people were recruited. The MCID was examined by dichotomising people into “improvers”, or “non‐improvers” based upon the Global Rating of Change (GRC) in physical abilities score. The mean (SD) 6MWT distance was 389.4 (93.6) m at programme start, and 427.8 (83.0) m at week eight completion. The test‐retest reliability was good (intraclass correlation coefficient = 0.89) and the MDD = 86.1 m. As there was no relationship between change in 6MWT distance and GRC physical abilities at week eight ( r = 0.132, p = 0.472) the MCID could not be calculated. Furthermore, no relationships were found between change in 6MWT distance and other self‐reported measures. Changes in GRC physical abilities and 6MWT were frequently discordant, with increased 6MWT for 7/11 “GRC non‐improvers” and decreased 6MWT for 7/21 “GRC improvers”. Amongst this cohort, change in physical ability may or may not be reflected by self‐reported change. Objective tests of physical ability are recommended for people attending pain services, and validated tests should align with intervention aims.
Large scale boron carbon nitride nanosheets with enhanced lithium storage capabilities
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2CC36998B
Abstract: Few-layered boron carbon nitride nanosheets are synthesized by a simple and environmentally friendly process. The BCN nanosheets have 2-6 atomic layers with high surface area and show enhanced storage performance in lithium batteries, as well as a stable capacity of ~100 mA h g(-1) at 2 A g(-1) for 5000 cycles.
TiO2 nanoparticles on nitrogen-doped graphene as anode material for lithium ion batteries
Publisher: Springer Science and Business Media LLC
Date: 28-04-2013
Direct Observation of High Photoresponsivity in Pure Graphene Photodetectors
Publisher: Springer Science and Business Media LLC
Date: 07-02-2017
Tailoring High-Performance Pd Catalysts for Chemoselective Hydrogenation Reactions via Optimizing the Parameters of the Double-Flame Spray Pyrolysis
Publisher: American Chemical Society (ACS)
Date: 08-03-2016
Large-scale synthesis of hexagonal corundum-type In2O3 by ball milling with enhanced lithium storage capabilities
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA00182B
Manipulating Moiré Excitons in Two-Dimensional Quantum Systems via Optical Microcavities
Publisher: Research Square Platform LLC
Date: 11-08-2023
DOI: 10.21203/RS.3.RS-3245746/V1
Abstract: Moiré-trapped interlayer excitons within two-dimensional (2D) moiré superlattices offer a remarkably versatile and adaptable platform, enabling an extensive exploration of dipole interactions and many-body correlations in the realm of 2D quantum systems. Conversely, optical microcavities, capable of confining photons within a confined space, profoundly lify the interplay between light and matter, ushering in a new era of possibilities for photonics research. However, the intricate synergy between moiré potential and optical microcavities remains shrouded in uncertainty. Here, we present a precise integration of a twisted WSe2/WSe2 homobilayer with an optical microcavity, forging a cooperative alliance between moiré excitons and microcavity photons. Our investigation unveils highly localized moiré-enhanced emission in the suspended WSe2/WSe2 homobilayer, distinguished by remarkably sharp emission lines with peak widths reduced by a factor of three, alongside distinctive valleytronic attributes. Notably, our pioneering work uncovers a profound transformation in the nature of moiré exciton-dipole interactions within the suspended twist-angle WSe2/WSe2 homobilayer. This transformation triggers an unprecedented shift from repulsive to attractive interactions, culminating in the emergence of a robust moiré biexciton phase—an occurrence previously confined to theoretical predictions. Our findings provide essential insights into the cooperative interplay between moiré excitons and optical microcavities, illuminating the underlying physics and charting a course for future research and technological advancements in this captivating realm.
Temperature dependence of the electrical transport properties in few-layer graphene interconnects
Publisher: Springer Science and Business Media LLC
Date: 25-07-2013
Abstract: We report a systematic investigation of the temperature dependence of electrical resistance behaviours in tri- and four-layer graphene interconnects. Nonlinear current–voltage characteristics were observed at different temperatures, which are attributed to the heating effect. With the resistance curve derivative analysis method, our experimental results suggest that Coulomb interactions play an essential role in our devices. The room temperature measurements further indicate that the graphene layers exhibit the characteristics of semiconductors mainly due to the Coulomb scattering effects. By combining the Coulomb and short-range scattering theory, we derive an analytical model to explain the temperature dependence of the resistance, which agrees well with the experimental results.
Selective loading of 5-fluorouracil in the interlayer space of methoxy-modified kaolinite for controlled release
Publisher: Elsevier BV
Date: 06-2018
Strain engineering of two-dimensional multilayered heterostructures for beyond-lithium-based rechargeable batteries
Publisher: Springer Science and Business Media LLC
Date: 03-07-2020
DOI: 10.1038/S41467-020-17014-W
Abstract: Beyond-lithium-ion batteries are promising candidates for high-energy-density, low-cost and large-scale energy storage applications. However, the main challenge lies in the development of suitable electrode materials. Here, we demonstrate a new type of zero-strain cathode for reversible intercalation of beyond-Li + ions (Na + , K + , Zn 2+ , Al 3+ ) through interface strain engineering of a 2D multilayered VOPO 4 -graphene heterostructure. In-situ characterization and theoretical calculations reveal a reversible intercalation mechanism of cations in the 2D multilayered heterostructure with a negligible volume change. When applied as cathodes in K + -ion batteries, we achieve a high specific capacity of 160 mA h g −1 and a large energy density of ~570 W h kg −1 , presenting the best reported performance to date. Moreover, the as-prepared 2D multilayered heterostructure can also be extended as cathodes for high-performance Na + , Zn 2+ , and Al 3+ -ion batteries. This work heralds a promising strategy to utilize strain engineering of 2D materials for advanced energy storage applications.
Pyrolysis kinetics of hydrochar using distributed activation energy model
Publisher: Wiley
Date: 12-09-2022
DOI: 10.1002/BBB.2426
Abstract: Producing hydrochar from landfill municipal solid wastes (MSW) is a sustainable alternative to existing waste management practices in low‐ and middle‐income countries. In this study, mixed MSW feedstock (sent for landfilling) was subjected to hydrothermal carbonization to produce hydrochars. The hydrochar showing the highest heating value was subjected to pyrolysis at 5, 10, and 20 K min −1 heating rates. Based on the pyrolysis characteristics, a three pseudo‐component‐based distributed activation energy model was employed to describe the pyrolysis kinetics. The activation energy distributions for the three pseudo‐components were 140 ± 8.7 kJ mol −1 , 190 ± 1 kJ mol −1 and 175.9 ± 24.9 kJ mol −1 , which were able to predict the pyrolysis profile at all heating rates with R 2 0.999. Differential thermogravimetric profiles of the hydrochar revealed its pyrolytic reactivity to resemble lignocellulosic constituents. Fourier‐transform infrared analysis of the hydrochar showed retention of oxygen‐containing functional groups (associated with lignocellulosic constituents) from the parent feedstock. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
Germania nanocrystals in Modified Chemical Vapour Deposition
Publisher: Elsevier BV
Date: 09-2008
Identification of various phases in HRTEM images of MgO-PSZ
Publisher: Oxford University Press (OUP)
Date: 11-2001
Abstract: Magnesia partially stabilized zirconia (MgO-PSZ) is one of the most commonly used engineering ceramics based on zirconia. A detailed discussion about how to identify the various phases in high-resolution transmission electron microscopy images of this material is presented. It shows that in some cases, standard procedures of image simulation are inadequate to interpret these images. By including the effect of astigmatism in both experimental and simulated images, together with the digital Fourier transforms of the images, orthorhombic ZrO2 in [001] orientation was identified. The delta-phase, which has a marked effect on the thermomechanical properties of MgO-PSZ, can most easily be identified by high-resolution imaging in the [130]c zone that coincides with a low-index zone axis of the delta-phase.
Fluorescent gold nanoparticles produced by femtosecond laser ablation with CTAB as a surfactant
Publisher: IEEE
Date: 02-2010
Unusual Freezing and Melting of Gallium Encapsulated in Carbon Nanotubes
Publisher: American Physical Society (APS)
Date: 26-08-2004
Nanoconfinement significantly improves the thermodynamics and kinetics of co-infiltrated 2LiBH4–LiAlH4 composites: Stable reversibility of hydrogen absorption/resorption
Publisher: Elsevier BV
Date: 10-2013
Atomic Mechanism of Predictable Phase Transition in Dual‐Phase H2Ti3O7/TiO2 (B) Nanofiber: An In Situ Heating TEM Investigation
Publisher: Wiley
Date: 23-07-2014
Abstract: The phase transition from H(2)Ti(3)O(7) to TiO(2) (B) in a 1D single nanocrystal of H(2)Ti(3)O(7) was observed by in situ heating in a transmission electron microscope experimentally. The results indicate a typical monoclinic-to-monoclinic crystallographic orientation relationship between the two phases. Moreover, the fundamental building blocks and invariant deformation element model were both adopted to reveal the atomic mechanism and predict the crystallographic orientation relationship quantitatively for the phase transition. The prediction was precisely consistent with TEM results.
Recent advances in synthesis, physical properties and applications of conducting polymer nanotubes and nanofibers
Publisher: Elsevier BV
Date: 10-2011
High-resolution TEM study of the Er distribution in Er-doped SiO2 films prepared by laser ablation
Publisher: Elsevier BV
Date: 05-2007
Photocatalytic degradation of phenol in water on as-prepared and surface modified TiO2 nanoparticles
Publisher: Elsevier BV
Date: 12-2015
Observation of moiré excitons in the twisted WS2/WS2 homostructure
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NR02450K
Abstract: We report observed moiré excitons in the WS 2 /WS 2 T-HS with a twist angle of about 1.5°. Our findings offer a promising prospective for further exploration of artificial excitonic crystals and quantum emitters of TMD moiré patterns.
Nanobeam electron diffraction and high resolution imaging analysis of InN films grown on sapphire
Publisher: Wiley
Date: 2007
DOI: 10.1002/JEMT.20398
Abstract: A JEOL JEM-3000F field emission, analytical, high-resolution transmission electron microscope (HRTEM) was used to study InN films grown on sapphire substrates. It was found that, while the InN films maintained the hexagonal (wurtzite) structure, InN nanodomains with a cubic (zincblende) structure were also formed in the films. Nanobeam electron diffraction techniques were applied for identification of the cubic phase. The identification of the cubic InN was confirmed by HRTEM structural imaging. The cubic InN nanodomains are 3-10 nm in diameter, and are orientated in two different orientations with their [110](cubic) and [110](cubic) axes parallel to each other and their (111)(cubic) planes parallel to the (0001)(hex) plane of the hexagonal InN.
Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices
Publisher: Research Square Platform LLC
Date: 14-09-2022
DOI: 10.21203/RS.3.RS-2037324/V1
Abstract: Moiré superlattice created by the stacking of twisted 2D layered materials have become a new platform for the study of quantum optics. The strong coupling of moiré superlattices can generate flat minibands that enhance electronic interactions and produce a variety of fascinating strongly correlated states such as non-conventional superconductivity, Mott insulating states and moiré excitons. However, the influence between the adjustment and localization of moiré excitons in Van der Waals heterostructures has not been the subject of experimental investigations. Here we report experimental evidence of the localization-enhanced moiré excitons in the twisted WSe2/WS2/WSe2 heterotrilayer with type-II band alignments. At low temperature, we observed multiple excitons splitting phenomena in the twisted WSe2/WS2/WSe2 heterotrilayer, manifesting as multiple sharp emission lines, contrasting strongly with the moiré excitonic behavior of the twisted WSe2/WS2 heterobilayer (the linewidth is 4 times narrower). This is primarily because the enhancement of the two moiré potentials in the twisted heterotrilayer enables the moiré excitons at the highly localized interface. Furthermore, the changes in temperature, laser power and valley polarization further demonstrate the confinement effect of moiré potential on moiré excitons. Our findings provide a new way for the localization of moiré excitons in twist-angle heterostructures, facilitating the development of coherent quantum light emitters.
Structural evolution and the capacity fade mechanism upon long-term cycling in Li-rich cathode material
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CP42068F
Abstract: High capacity Li-rich layered cathode Li(Li(0.2)Mn(0.54)Ni(0.13)Co(0.13))O(2) and doped one are investigated to understand mechanisms of capacity fade as well as voltage decrease upon long-term cycling. Detailed electrochemical analysis reveals a phase-separation-like behavior with increase in the cycle number, which is responsible for gradual reduction in discharge voltage. X-ray photoelectron spectroscopy (XPS), transmission electron microscope coupled with energy dispersive X-ray spectroscopy (TEM-EDS) and inductively coupled plasma emission spectrometry (ICP) analysis results show increase in valence of transition metals on the surface of powder at a fully discharged state in addition to surface dissolution of Ni, leading to rapid capacity loss. High resolution transmission electron microscopy (HR-TEM) shows a phase transformation from original layered structure into spinel-like nano-domains in local structure. Though such an unexpected structural change is unfavorable because of lower output voltage, it is observed to be beneficial for high-rate performance.
Eu-doped boron nitride nanotubes as a nanometer-sized visible-light source
Publisher: Wiley
Date: 16-07-2007
First principles study of 3d transition metal doped Cu3N
Publisher: Elsevier BV
Date: 09-2012
In-situ synthesis of Ag nanoparticles by electron beam irradiation
Publisher: Elsevier BV
Date: 12-2015
Carbon‐Coated Li3N Nanofibers for Advanced Hydrogen Storage
Publisher: Wiley
Date: 21-08-2013
Abstract: 3D porous carbon-coated Li3 N nanofibers are successfully fabricated via the electrospinning technique. The as-prepared nanofibers exhibit a highly improved hydrogen-sorption performance in terms of both thermodynamics and kinetics. More interestingly, a stable regeneration can be achieved due to the unique structure of the nanofibers, over 10 cycles of H2 sorption at a temperature as low as 250 °C.
Heterogeneous nucleation of β-type precipitates on nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy
Publisher: Springer Science and Business Media LLC
Date: 08-06-2012
Abstract: Zirconium (Zr) is an important alloying element to Mg-Zn-based alloy system. In this paper, we report the formation of the β-type precipitates on the nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy during ageing at 180°C. Scanning transmission electron microscopy examinations revealed that the nanoscale Zr-rich [0001] α rods/laths are dominant in the Zr-rich core regions of the as-quenched s le after a solution treatment at 430°C. More significantly, these Zr-rich particles served as favourable sites for heterogeneous nucleation of the Zn-rich β-type phase during subsequent isothermal ageing at 180°C. This research provides a potential route to engineer precipitate microstructure for better strengthening effect in the Zr-containing Mg alloys.
Suppression of dislocations by Sb spray in the vicinity of InAs/GaAs quantum dots
Publisher: Springer Science and Business Media LLC
Date: 30-05-2014
In Situ Formation of BN Nanotubes during Nitriding Reactions
Publisher: American Chemical Society (ACS)
Date: 09-2005
DOI: 10.1021/CM050966F
Rare-earth doped boron nitride nanotubes
Publisher: Elsevier BV
Date: 2008
Ga-filled single-crystalline MgO nanotube: Wide-temperature range nanothermometer
Publisher: AIP Publishing
Date: 30-07-2003
DOI: 10.1063/1.1597422
Abstract: A highly effective one-step approach was developed to synthesize single-crystalline MgO nanotubes and in situ fill nanotubes with Ga. The axes of nanotubes are in the [100] direction of cubic MgO. The prepared nanotube exhibits a square-like cross section both for its interior and exterior. The liquid metal-assisted route is suggested to be a general way to prepare oxide nanotubes. Linear thermal expansion behavior recorded for liquid gallium column confined in the MgO nanotube makes possible creation of a wide-temperature range nanothermometer with superior mechanical properties and environmental structural stability.
Study the electronic responses of individual nanoparticles by electron energy loss spectroscopy in a transmission electron microscope
Publisher: IEEE
Date: 10-2010
10.4028/0-87849-364-6.504
Publisher: Trans Tech Publications Ltd.
Date: 2005
Structural, optical and magnetic properties of Co-doped ZnO nanorods with hidden secondary phases
Publisher: IOP Publishing
Date: 25-03-2015
DOI: 10.1088/0957-4484/19/45/455702
Abstract: Co-doped ZnO nanorods (composition: Zn(0.955)Co(0.045)O) were grown by a simple surfactant-assisted hydrothermal technique. The morphological, structural, optical and magnetic properties of the as-prepared nanorods were investigated by means of scanning electron microscopy, high-resolution transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, micro-Raman spectroscopy, micro-cathodoluminescence, and vibrating s le magnetometry (VSM). The results showed that the s le had rod-like morphology and that the preferential growth direction was along the c axis. While Co was successfully doped into the ZnO wurtzite lattice structure as revealed by several characterization techniques, hidden secondary phases of Zn(y)Co(3-y)O(4) (0≤y≤1) were also clearly detected by the micro-Raman spectroscopic technique. We propose that the predominant diffusion-limited Ostwald ripening crystal growth mechanism under the hydrothermal coarsening yielded such phase segregation. VSM results showed that the nanorods displayed relatively weak room-temperature ferromagnetism. We suggest that the origin of the ferromagnetism is probably due to the presence of the mixed cation valence of Co via a d-d double-exchange mechanism rather than the real doping effect. It is essential to control the crystal growth mechanism and defect states associated with the ferromagnetism in order to realize the intrinsic diluted magnetic semiconductors.
Formation of mesopores inside platinum nanospheres by using double hydrophilic block copolymers
Publisher: Elsevier BV
Date: 11-2016
Controlled synthesis and characterization of 10 nm thick Al2O3 nanowires
Publisher: Elsevier BV
Date: 05-2009
A Novel Method for Preparing Copper Nanorods and Nanowires
Publisher: Wiley
Date: 17-02-2003
The biocompatibility of diamond-like carbon nano films
Publisher: IEEE
Date: 2006
Direct synthesis and strong cathodoluminescence of Al2O3 nanotubes
Publisher: Elsevier BV
Date: 04-2010
Mesoporous TiO2/Zn2Ti3O8 hybrid films synthesized by polymeric micelle assembly
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5CC04903B
Abstract: A hybrid mesoporous TiO 2 /Zn 2 Ti 3 O 8 film synthesized by a polymeric micelle assembly approach.
Performance evaluation of carbon nanotube enhanced membranes for SWRO pretreatment application
Publisher: Elsevier BV
Date: 06-2016
Synthesis of tungsten oxide nanowires
Publisher: Elsevier BV
Date: 04-2003
Role of carbon coating in improving electrochemical performance of Li-rich Li(Li0.2Mn0.54Ni0.13Co0.13)O2cathode
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA04976D
Abstract: Li-rich Li(Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 )O 2 cathode coated with carbon layer has been prepared by a hydrothermal approach. The enhanced performance is attributed to the carbon layer and surface spinels on particles.
Hydrogen adsorption capacity of adatoms on double carbon vacancies of graphene: A trend study from first principles
Publisher: American Physical Society (APS)
Date: 03-01-2013
Evidence for moiré intralayer excitons in twisted WSe2/WSe2 homobilayer superlattices
Publisher: Springer Science and Business Media LLC
Date: 06-2022
DOI: 10.1038/S41377-022-00854-0
Abstract: Recent advances in twisted van der Waals heterostructure superlattices have emerged as a powerful and attractive platform for exploring novel condensed matter physics due to the interplay between the moiré potential and Coulomb interactions. The moiré superlattices act as a periodic confinement potential in space to capture interlayer excitons (IXs), resulting in moiré exciton arrays, which provide opportunities for quantum emitters and many-body physics. The observation of moiré IXs in twisted transition-metal dichalcogenide (TMD) heterostructures has recently been widely reported. However, the capture and study of the moiré intralayer excitons based on TMD twisted homobilayer (T-HB) remain elusive. Here, we report the observation of moiré intralayer excitons in a WSe 2 /WSe 2 T-HB with a small twist angle by measuring PL spectrum. The multiple split peaks with an energy range of 1.55–1.73 eV are different from that of the monolayer WSe 2 exciton peaks. The split peaks were caused by the trapping of intralayer excitons via the moiré potential. The confinement effect of the moiré potential on the moiré intralayer excitons was further demonstrated by the changing of temperature, laser power, and valley polarization. Our findings provide a new avenue for exploring new correlated quantum phenomena and their applications.
Influence of non-hydrolyzable groups in silane precursor on pore dimension and photochromic properties of sol-gel silica embedded with a spirooxazine dye
Publisher: Springer Science and Business Media LLC
Date: 11-2015
Synthesis and characterization of L12ordered silver-copper alloy nanodendrites
Publisher: IOP Publishing
Date: 03-03-2014
Giant Nonlinear Optical Activity in Two-Dimensional Palladium Diselenide
Publisher: Research Square Platform LLC
Date: 28-07-2020
DOI: 10.21203/RS.3.RS-38019/V1
Abstract: Nonlinear optical (NLO) effects in layered atomically thin two-dimensional (2D) materials provide a promising prospect for multifarious optoelectronic applications. The NLO characteristics of transition metal chalcogenides (TMDCs) are attracting growing attention and have been extensively explored recently. However, these materials possess sizable bandgaps ranging from visible to ultraviolet regions, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the NLO processes in palladium diselenide (PdSe2) flakes that have a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation (SHG) feature, embodied in the strong (negligible) SHG signals in even (odd) layers, in contrast with that of other TMDCs. Furthermore, the two-photon absorption (TPA) coefficients (β ~4.5×105, 2.83×105, 1.7×105, and 1.85×104 cm/GW) of 1-3 L and bulk PdSe2 are larger by two and three orders of magnitude, compared with that of the conventional 2D materials. Significantly, at the excitation wavelength of 600 nm, a robust saturable absorption with giant modulation depths (αs ~47%, 30%, and 41%) was observed in 1-3 L PdSe2, which has yet been obtained in other 2D materials. Such unique NLO characteristics enable PdSe2 to be a potential candidate for technological innovations in nonlinear optoelectronic devices.
Damage-free polishing of monocrystalline silicon wafers without chemical additives
Publisher: Elsevier BV
Date: 12-2008
High flux and high selectivity carbon nanotube composite membranes for natural organic matter removal
Publisher: Elsevier BV
Date: 05-2016
High-resolution transmission electron microscopy and electron-energy-loss spectroscopy study of the phase Mg2Zr5O12in MgO-partially stabilized zirconia
Publisher: Informa UK Limited
Date: 03-2001
Facet-Controlling Agents Free Synthesis of Hematite Crystals with High-Index Planes: Excellent Photodegradation Performance and Mechanism Insight
Publisher: American Chemical Society (ACS)
Date: 24-12-2015
Abstract: Hematite (α-Fe2O3) crystals with uniform size and structure are synthesized through very facile one-pot hydrothermal methods without any additive. The as-synthesized sub-micrometer-sized α-Fe2O3 crystals with small surface areas perform superb visible light photodegradation activities, even much better than most other α-Fe2O3 nanostructures with large surface areas. Profound mechanism analyses reveal that the microwave-assisted hydrothermal (Mic-H) synthesized α-Fe2O3 is enclosed by 12 high-index {2-15} facets. The structure and the low unoccupied molecular orbital (LUMO) of the high-index planes result in the excellent photocatalytic activity. This is the first report on the formation of {2-15} plane group of hematite, and the synthesis of the hematite particles with the {2-15} planes is very simple and no any facet-controlling agent is used. This study may pave the way to further performance enhancement and practical applications of the cheap hematite materials.
Flame synthesis of carbon nanostructures on ni-plated hardmetal substrates
Publisher: Springer Science and Business Media LLC
Date: 13-04-2011
Abstract: In this article, we demonstrate that carbon nanostructures could be synthesized on the Ni-plated YG6 (WC-6 wt% Co) hardmetal substrate by a simple ethanol diffusion flame method. The morphologies and microstructures of the Ni-plated layer and the carbon nanostructures were examined by various techniques including scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. The growth mechanism of such carbon nanostructures is discussed. This work may provide a strategy to improve the performance of hardmetal products and thus to widen their potential applications.
Atomic-scale tandem regulation of anionic and cationic migration for long-life alkali metal batteries
Publisher: Research Square Platform LLC
Date: 02-02-2021
DOI: 10.21203/RS.3.RS-144424/V1
Abstract: Atomic-scale regulation of both cationic and anionic transport is of great significance in membrane-based separation technologies. Ionic transport regulation techniques could also play a crucial role in developing high-performance alkali metal batteries such as alkali metal-sulfur and alkali metal-selenium batteries, which suffer from the non-uniform transport of alkali metal ions and detrimental shuttling of polysulfide olyselenide (PS) anions. These obstacles can cause severe growth of alkali metal dendrites and the irreversible consumption of active cathodes, leading to capacity decay and short cycling life. Herein, we report long-life alkali metal batteries enabled by atomic-scale tandem regulation of the migration of both alkali metal cations (Li+/Na+) and PS anions using negatively charged Ti0.87O2 nanosheets with Ti atomic vacancies. The shuttling of PS anions has been effectively eliminated via a robust electrostatic repulsion between the negatively charged nanosheets and PS anions. The negatively charged nanosheets can also regulate the migration of Li+/Na+ ions to ensure a homogeneous ion flux through efficient but light adhesion of Li+/Na+ ions within the nanosheets. The atomic Ti vacancies act as sub-nanometre pores to provide fast diffusion channels for Li+/Na+ ions. Therefore, eradication of PS shuttling and stable Li/Na-ion diffusion without compromising the fast transport of Li+/Na+ ions has been achieved for long-life alkali metal-sulfur and alkali metal-selenium batteries. This work provides a facile and effective strategy to regulate the transport of both cations and anions for developing advanced rechargeable batteries by using two-dimensional vacancy-enhanced materials.
A dual soft-template synthesis of hollow mesoporous silica spheres decorated with Pt nanoparticles as a CO oxidation catalyst
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA17340J
Abstract: Hollow mesoporous silica spheres decorated with fine Pt nanoparticles are prepared through a dual soft-template system and used as a catalyst for high-temperature CO oxidation.
Dynamic Control of High-Range Photoresponsivity in a Graphene Nanoribbon Photodetector
Publisher: Springer Science and Business Media LLC
Date: 03-06-2020
DOI: 10.1186/S11671-020-03352-7
Abstract: Graphene has been demonstrated to be a promising material for optoelectronics and photodetection devices because of its ultra-broadband optical absorption and high carrier mobility. However, its integration with optoelectronic systems has been limited by the zero-bandgap and the lack of a gain mechanism. Herein, we demonstrate a novel photodetector based on the graphene nanoribbons (GRNs) with a sizable bandgap. Utilizing trapping charge at the interface between SiO 2 and light-doped silicon, an ultrahigh gain of 22,400 has been obtained. Our devices show an enhanced photoresponsivity (~ 800 AW −1 ) while the response speed is still fast (up to 10 μs). This photoresponsivity is about two orders of magnitude higher compared to that of a previous graphene-based photodetector. The photodetector exhibits a wide-range tunability via source-drain bias and back gate voltage. Our work addresses key challenges for the photodetectors and potentially provides the desired pathway toward practical application of graphene photodetectors that can be externally manipulated by an electric field with fast response speed and high sensitivity.
A novel method for practical temperature measurement with carbon nanotube nanothermometers
Publisher: IOP Publishing
Date: 27-06-2006
Uniform Micro-Sized ?- and ?-Si3N4 Thin Ribbons Grown by a High-Temperature Thermal-Decomposition/Nitridation Route
Publisher: Wiley
Date: 23-01-2004
Abstract: Uniform micro-sized alpha- and beta-Si(3)N(4) thin ribbons have been achieved by a high-temperature thermal-decomposition/nitridation route. As-grown ribbons were characterized by using powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, electron energy loss spectroscopy, and cathodoluminescence. These alpha- and beta-Si(3)N(4) ribbons are structurally uniform micro-sized single crystals, and have a width of approximately 2-3 microns, a thickness of approximately 20-60 nm, and a length, that ranges from several hundreds of microns to the order of millimeters. A room-temperature cathodoluminescence spectrum recorded from these ribbons shows one intensive blue emission peak at approximately 433 nm. The growth for the new ribbon form of this material is believed to be dominated by a vapor-solid process.
Moiré superlattices and related moiré excitons in twisted van der Waals heterostructures
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CS01002B
Abstract: Recent advances in moiré superlattices and moiré excitons, such as quantum emission arrays, low-energy flat bands, and Mott insulators, have rapidly attracted attention in the fields of optoelectronics, materials, and energy research.
Synthesis of Crystalline Silicon Tubular Nanostructures with ZnS Nanowires as Removable Templates
Publisher: Wiley
Date: 2004
Ilmenite FeTiO3 Nanoflowers and Their Pseudocapacitance
Publisher: American Chemical Society (ACS)
Date: 15-08-2011
DOI: 10.1021/JP203345S
Hierarchical Porous Li2Mg(NH)2@C Nanowires with Long Cycle Life Towards Stable Hydrogen Storage
Publisher: Springer Science and Business Media LLC
Date: 13-10-2014
DOI: 10.1038/SREP06599
Formation of spinel from olivine
Publisher: AIP Publishing
Date: 10-03-2004
DOI: 10.1063/1.1675939
Abstract: High-resolution transmission electron microscopy (HRTEM) was used to study the olivine to spinel transformation. HRTEM structure images of Mg2GeO4 olivine deformed under a pressure of 6 GPa at 600 °C clearly show that a shear mechanism dominates the transformation. The transformation is not a nucleation and growth mechanism. It also differs in certain crucial aspects from the type of martensitic transformation proposed before. During the transformation, it is a shear movement that brings the oxygen anions to their positions in the spinel structure. An edge dislocation following each shear then puts the cations in their spinel sites. The Burgers’ vector of each dislocation is perpendicular to the anion shear direction.
From platy kaolinite to aluminosilicate nanoroll via one-step delamination of kaolinite: Effect of the temperature of intercalation
Publisher: Elsevier BV
Date: 10-2013
Hydrolysis and regeneration of sodium borohydride (NaBH4 ) – A combination of hydrogen production and storage
Publisher: Elsevier BV
Date: 08-2017
Fe3O4/rice husk-based maco-/mesoporous carbon bone nanocomposite as superior high-rate anode for lithium ion battery
Publisher: Springer Science and Business Media LLC
Date: 25-07-2016
EFFECT OF THE THICKNESS OF PAN/Au MODIFIED ELECTRODE ON BIOSENSOR SENSITIVITY
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2012
DOI: 10.1142/S179360471250035X
Abstract: A simple electrospinning method was used to control the thickness of polyacrylonitrile (PAN)/Au modified electrode. The influence of membrane thickness to modified electrode sensitivity was discussed. In our experiment, a 20-min electrospinning time and a mass ratio of 3:1 PAN/ HAuCl 4 are the optimum parameters to generate the high performance PAN/Au membrane modified electrode for detecting H 2 O 2 which has a sensitivity of 145.63 mA M -1 cm -2 ) and a wide linear range of 20 μM–20 mM.
Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices
Publisher: Springer Science and Business Media LLC
Date: 12-05-2023
DOI: 10.1038/S41377-023-01171-W
Abstract: The stacking of twisted two-dimensional (2D) layered materials has led to the creation of moiré superlattices, which have become a new platform for the study of quantum optics. The strong coupling of moiré superlattices can result in flat minibands that boost electronic interactions and generate interesting strongly correlated states, including unconventional superconductivity, Mott insulating states, and moiré excitons. However, the impact of adjusting and localizing moiré excitons in Van der Waals heterostructures has yet to be explored experimentally. Here, we present experimental evidence of the localization-enhanced moiré excitons in the twisted WSe 2 /WS 2 /WSe 2 heterotrilayer with type-II band alignments. At low temperatures, we observed multiple excitons splitting in the twisted WSe 2 /WS 2 /WSe 2 heterotrilayer, which is manifested as multiple sharp emission lines, in stark contrast to the moiré excitonic behavior of the twisted WSe 2 /WS 2 heterobilayer (which has a linewidth 4 times wider). This is due to the enhancement of the two moiré potentials in the twisted heterotrilayer, enabling highly localized moiré excitons at the interface. The confinement effect of moiré potential on moiré excitons is further demonstrated by changes in temperature, laser power, and valley polarization. Our findings offer a new approach for localizing moiré excitons in twist-angle heterostructures, which has the potential for the development of coherent quantum light emitters.
Thermal oxidation of gallium nitride nanowires
Publisher: AIP Publishing
Date: 07-10-2003
DOI: 10.1063/1.1618943
Abstract: The thermal oxidation of gallium nitride (GaN) nanowires in dry air was investigated by using thermogravimetric and transmission electron microscopy. The oxidation strongly depends on the oxidation temperature and the nanowire diameters. At temperatures lower than 700 °C, the oxidation is dominantly controlled by an oxygen absorption reaction. A chemical oxidation reaction occurs upon further increasing the temperature, accompanied by the formation of monoclinic gallium oxide (Ga2O3). The crystalline Ga2O3 can form a dense protective shell on the surfaces of GaN nanowires with large diameters, whereas Ga2O3 could not crystallize into one-dimensional morphology on the initial GaN nanowires with small diameters.
Predictable and controllable dual-phase interfaces in TiO2(B)/anatase nanofibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4NR04613G
Abstract: The TiO 2 (B)/anatase interfaces were predicted successfully with a method with high practicality. The related phase transformation mechanism was also interpreted based on the predicted results.
The effect of fast annealing treatment on the interface structure and electrical properties of Au/Hg3In2Te6 contact
Publisher: Springer Science and Business Media LLC
Date: 19-06-2014
Structural characterization and high-temperature compressive creep of PTFE-based composites filled with inorganic nanoparticles
Publisher: Wiley
Date: 14-02-2011
DOI: 10.1002/PAT.1915
Preparation of dense nanostructured titania ceramic using two step sintering
Publisher: Informa UK Limited
Date: 03-2010
Multi-holed clay nanotubes and their modification with a polyaniline nanolayer
Publisher: Springer Science and Business Media LLC
Date: 21-09-2011
ONGOING DISCUSSION + SOVIET FORCED LABOR CAMPS
Publisher: Cambridge University Press (CUP)
Date: 1989
DOI: 10.2307/2499843
Interpretation of the vacancy-ordering controlled growth morphology of Hg5In2Te8 precipitates in Hg3In2Te6 single crystals by TEM observation and crystallographic calculation
Publisher: Elsevier BV
Date: 02-2015
Magic numbers of nanoholes in graphene: Tunable magnetism and semiconductivity
Publisher: American Physical Society (APS)
Date: 06-09-2011
Atomic-scale investigation of a new phase transformation process in TiO2nanofibers
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6NR08046D
Abstract: Crystallography of phase transformation combining transmission electron microscopy (TEM) with in situ heating techniques and X-ray diffraction (XRD) can provide critical information regarding solid-state phase transitions and the transition-induced interfaces in TiO
Single-crystalline, submicrometer-sized ZnSe tubes
Publisher: Wiley
Date: 18-04-2005
Observation of split defect-bound excitons in twisted WSe2/WSe2 homostructure
Publisher: AIP Publishing
Date: 12-10-2020
DOI: 10.1063/5.0015431
Abstract: The excitonic effects in two-dimensional transition metal dichalcogenides and their heterostructures have been extensively investigated. Significantly, the moiré excitons, induced by a moiré superlattice in a twisted heterostructure, have triggered tremendous attention, demonstrating the practicability of artificial excitonic crystals. Besides, recent works have shown that the excitonic states in homostructures also exhibit novel properties worthy of further development. Here, we present a tear-and-stack technique for fabricating a regular or a twisted homostructure. Such a strategy was utilized to reassemble a monolayer WSe2 into a twisted homostructure, and various excitons from this structure have been identified in the photoluminescence spectra. Interestingly, the unusual equidistant splitting was first observed in the defect-bound excitons. It is believed that this phenomenon is attributed to the various defect states and the local stacking patterns. This interpretation is supported by theoretical calculations, which show the dependence of the energy band structure on different defect states and local stacking patterns. These unconventional defect-bound excitons are key building blocks in the research of homostructures that highlight the feasibility of artificially manipulating local excitons for practical applications.
Automated process synthesis for optimal flowsheet design of a hybrid membrane cryogenic carbon capture process
Publisher: Elsevier BV
Date: 05-2017
Giant nonlinear optical activity in two-dimensional palladium diselenide
Publisher: Springer Science and Business Media LLC
Date: 17-02-2021
DOI: 10.1038/S41467-021-21267-4
Abstract: Nonlinear optical effects in layered two-dimensional transition metal chalcogenides have been extensively explored recently because of the promising prospect of the nonlinear optical effects for various optoelectronic applications. However, these materials possess sizable bandgaps ranging from visible to ultraviolet region, so the investigation of narrow-bandgap materials remains deficient. Here, we report our comprehensive study on the nonlinear optical processes in palladium diselenide (PdSe 2 ) that has a near-infrared bandgap. Interestingly, this material exhibits a unique thickness-dependent second harmonic generation feature, which is in contrast to other transition metal chalcogenides. Furthermore, the two-photon absorption coefficients of 1–3 layer PdSe 2 ( β ~ 4.16 × 10 5 , 2.58 × 10 5 , and 1.51 × 10 5 cm GW −1 ) are larger by two and three orders of magnitude than that of the conventional two-dimensional materials, and giant modulation depths ( α s ~ 32%, 27%, and 24%) were obtained in 1–3 layer PdSe 2 . Such unique nonlinear optical characteristics make PdSe 2 a potential candidate for technological innovations in nonlinear optoelectronic devices.
Quantification of graphene based core/shell quantum dots from first principles
Publisher: AIP Publishing
Date: 31-10-2011
DOI: 10.1063/1.3657488
Abstract: Density functional calculations are performed to study the electronic structure of recently proposed graphene/graphane based core/shell quantum dots, which have a type I band alignment and exhibit quantized carrier energy levels. Strong confinement is robust with shell thickness. The bandgap, band offset, and the number of confined carrier orbitals with different size and geometry are determined. Our findings indicate that these core/shell dots are potentially well suited for the design of advanced diode lasers and room-temperature single electron devices. The proposed method to determine the number of confined orbitals is applicable for other quantum dot systems.
Effects of crystallization and dopant concentration on the emission behavior of TiO2:Eu nanophosphors
Publisher: Springer Science and Business Media LLC
Date: 03-01-2012
Synthesis of Mesoporous Transition‐Metal Phosphates by Polymeric Micelle Assembly
Publisher: Wiley
Date: 18-04-2016
Abstract: Mesoporous iron phosphate (FePO 4 ) was synthesized through assembly of polymeric micelles made of asymmetric triblock co‐polymer (polystyrene‐ b ‐poly‐2‐vinylpyridine‐ b ‐ethylene oxide PS‐PVP‐PEO). The phosphoric acid solution stimulates the formation of micelles with core–shell‐corona architecture. The negatively charged PO 4 3− ions dissolved in the solution strongly interact with the positively charged PVP + units through an electrostatic attraction. Also, the presence of PO 4 3− ions realizes a bridge between the micelle surface and the metal ions. The removal of polymeric template forms the robust framework of iron phosphate with 30 nm pore diameter and 15 nm wall thickness. Our method is applicable to other mesoporous metal phosphates by changing metal sources. The obtained materials were fully characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), N 2 adsorption–desorption, Raman spectroscope, and other techniques.
Thermo-analysis of nanocrystalline TiO2 ceramics during the whole sintering process using differential scanning calorimetry
Publisher: Elsevier BV
Date: 03-2010
Electrical Conductivity Studies on Individual Conjugated Polymer Nanowires: Two-Probe and Four-Probe Results
Publisher: Springer Science and Business Media LLC
Date: 13-11-2010
DOI: 10.1007/S11671-009-9471-Y
Abstract: Two- and four-probe electrical measurements on in idual conjugated polymer nanowires with different diameters ranging from 20 to 190 nm have been performed to study their conductivity and nanocontact resistance. The two-probe results reveal that all the measured polymer nanowires with different diameters are semiconducting. However, the four-probe results show that the measured polymer nanowires with diameters of 190, 95–100, 35–40 and 20–25 nm are lying in the insulating, critical, metallic and insulting regimes of metal–insulator transition, respectively. The 35–40 nm nanowire displays a metal–insulator transition at around 35 K. In addition, it was found that the nanocontact resistance is in the magnitude of 10 4 Ω at room temperature, which is comparable to the intrinsic resistance of the nanowires. These results demonstrate that four-probe electrical measurement is necessary to explore the intrinsic electronic transport properties of isolated nanowires, especially in the case of metallic nanowires, because the metallic nature of the measured nanowires may be coved by the nanocontact resistance that cannot be excluded by a two-probe technique.
Microstructure and mechanical properties of Mg-6Zn-xCu-0.6Zr (wt.%) alloys
Publisher: Elsevier BV
Date: 02-2011
Inundation and Fire Shape the Structure of Riparian Forests in the Pantanal, Brazil
Publisher: Public Library of Science (PLoS)
Date: 09-06-2016
A Green and Facile Synthesis of Ordered Mesoporous Nanosilica Using Coal Fly Ash
Publisher: American Chemical Society (ACS)
Date: 09-08-2016
Graphene based dots and antidots: A comparative study from first principles
Publisher: American Scientific Publishers
Date: 02-2013
Abstract: Graphene based quantum dots and antidots are two nanostructures of primary importance for their fundamental physics and technological applications, particularly in the emerging field of graphene-based nanoelectronics and nanospintronics. Herein, based on first principles density functional theory calculations, we report a comparative study on the electronic structure of these two structurally complementary entities, where the bandgap opening, edge magnetism and the role of hydrogenation are investigated. Our results show the ersity of electronic structures of various dots and antidots, whose properties are sensitive to the edge detailed geometry (including size and shape and edge type). Hydrogen passivation plays an essential roal in affecting the related properties, in particular, it leads to larger bandgap values and suppress the edge magnetism. The frontier orbital analysis is employed to rationalize and compare the complicated nature of dots and antidots. Based on the specific geometrical consideration and the total energy competition of the ground antiferromagnetic and the ferromagnetic states, some magnetic structures (the unpassivated 42-atom-antidot and 54-atom-dot) are proposed to be useful as magnetic switches.
Nano-confined multi-synthesis of a Li-Mg-N-H nanocomposite towards low-temperature hydrogen storage with stable reversibility
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA00259A
Abstract: De-/re-hydrogenation of Li 2 Mg(NH) 2 at a temperature as low as 105 °C and stable reversibility through up to 20 cycles are successfully achieved by the nanosize-induced effects by double-shelled hollow carbon spheres.
DLC coatings: Effects of physical and chemical properties on biological response
Publisher: Elsevier BV
Date: 03-2007
DOI: 10.1016/J.BIOMATERIALS.2006.12.010
Abstract: Recent trials on diamond-like carbon (DLC) coated medical devices have indicated promise for blood interfacing applications. The literature is sparse regarding structural and compositional effects of DLC on cellular response. An important goal in optimizing blood-interfacing implants is minimal macrophage attachment, and maximal albumin:fibrinogen adsorption ratio. DLC coatings deposited by PACVD and FAD, were analysed with respect to sp3 content (EELS), hydrogen content (ERDA), surface composition (XPS), surface roughness (AFM), surface energy, albumin:fibrinogen adsorption ratio, and macrophage viability and attachment. We found that increasing surface roughness and surface energy enhanced the macrophage viability and the albumin:fibrinogen adsorption ratio. We also found that the higher the hydrogen content for a-C:Hs deposited by PACVD, the lower the albumin:fibrinogen adsorption ratio, and macrophage attachment. This suggests that hydrogen content may be an important factor for influencing the biological response of DLC surfaces. Macrophage cells spread well on all DLC surfaces, and the surface results indicated the non-toxic nature of the surfaces on the cells at the time points tested.
Hydrogen-induced decomposition of Zr-rich cores in an Mg−6Zn−0.6Zr−0.5Cu alloy
Publisher: Elsevier BV
Date: 09-2012
Moiré Enhanced Potentials in Twisted Transition Metal Dichalcogenide Trilayers Homostructures
Publisher: Research Square Platform LLC
Date: 11-05-2022
DOI: 10.21203/RS.3.RS-1619289/V1
Abstract: Moiré superlattices in the twisted van der Waals materials have become an excellent platform for exploring new quantum phenomena due to the interaction between atomic structure and electronic correlation. Moiré superlattice can generate periodic moiré potential, which can constrain the recombination of excitons, leading to exotic quantum phenomena, including moiré excitons, flat bands, etc., which have been extensively reported in TMDs structures. However, the effect between the modulating of the moiré potential and the number of twisted layers has not been the subject of experimental research yet. Here we synthesized a twisted trilayer homostructure by a dry-transfer method and the enhancement of the moiré potential by the number of twisted layers is investigated. The moiré potential depths of the twisted bilayer and trilayer homostructure are 111 and 212 meV (increased by 91%), which further demonstrate that the depth of the moiré potential can be controlled by adjusting the number of stacked layers. Enhanced moire potential allows observation of moire excitons at 77 K, which are improved by an order of magnitude bigger than those of other moiré excitons(less than 10 K). Our results provide a new method for controllable preparation of moire potentials and a new avenue for further exploration of highly correlated quantum phenomena.
Porous ZnO nanonetworks grown by molecular beam epitaxy
Publisher: IOP Publishing
Date: 12-03-2012
DOI: 10.1088/0022-3727/45/13/135301
Abstract: Plasma-assisted molecular beam epitaxy was employed to create porous nanonetworks of ZnO directly on GaN epilayers without the use of catalysts or templates. Detailed analysis of scanning electron microscopy (SEM) images of both as-grown and etched s les reveals that the typical porous nanonetwork structure is multilayered, and suggests that dislocations originating at the GaN/sapphire heterointerface and/or defects characterizing an unusually rough GaN surface are responsible. The pore size distribution of the nanonetwork was measured using nuclear magnetic resonance (NMR) cryoporometry. A bimodal pore size distribution centred at 4 nm and 70 nm, respectively, was observed, consistent with the existence of small nanoscale pores in the bulk of the s le, and large open pores on the surface of the porous nanonetwork as observed by SEM.
Synthesis of Gallium-Filled Gallium Oxide–Zinc Oxide Composite Coaxial Nanotubes
Publisher: Wiley
Date: 17-06-2003
Oxidation behaviour of copper nanorods
Publisher: Elsevier BV
Date: 08-2003
GPS-based 6-minute walk test for people with persistent pain: a validation study (Preprint)
Publisher: JMIR Publications Inc.
Date: 27-02-2023
Abstract: he 6-minute walk test (6MWT) is a common method to assess the exercise capacity of people with many health conditions, including persistent pain. However, it is conventionally performed with in-person supervision in a hospital or clinic, therefore requiring staff resources. It may also be difficult when in-person supervision is unavailable, such as during the COVID-19 pandemic or when the person is geographically remote. his study aimed to assess the validity of a GPS-based smartphone app to measure walking distance as an alternative to the conventional 6MWT, in a persistent pain population. eople with persistent pain (n=36) were recruited to complete: 1) a conventional 6MWT and 2) 6MWT measured by a smartphone app using the global positioning system (GPS). Tests were performed in random order, separated by a 15-minute rest. The 95% limits of agreement were calculated using the Bland-Altman method, with a specified maximum allowable difference of 100m. he mean 6MWD measured by the GPS-based smartphone app was 13.2m higher (SD 46, 95%CI [−2.7, 29.1]) than the 6MWD assessed in the conventional manner. The 95% limits of agreement were 103.9m (95%CI [87.4, 134.1]) and −77.6m (95%CI [−107.7, −61.0]), which exceeded the maximum allowable difference. n in iduals with persistent pain, the two methods of assessing 6MWT may not be interchangeable due to limited validity. Future research is needed to improve the accuracy of the GPS-based approach. Despite its limitations, the GPS-based 6MWT may still have value as a tool for remote monitoring that could allow in iduals with persistent pain to self-administer frequent assessments of their functional capacity in their home environment.
Unconventional Ribbon-Shaped β-Ga2O3 Tubes with Mobile Sn Nanowire Fillings
Publisher: American Chemical Society (ACS)
Date: 22-12-2007
DOI: 10.1021/NN700285D
Abstract: We report on the synthesis of novel, unconventional beta-Ga(2)O(3) tubes via a Sn nanowire template process using thermal decomposition and oxidation of SnO and GaN powder mixtures. Distinctly different from any previously reported nano- and microtubes, the present beta-Ga(2)O(3) tubes display a flattened and thin belt-like (or ribbon-like) morphology. Each ribbon-shaped tube has a width of approximately 1-2 microm over its entire length, a length in the range of tens of micrometers, a thickness of approximately 100-150 nm, and a uniform inner diameter of 30-120 nm. The tubes were either partially or completely filled with Sn nanowires, forming Sn/Ga(2)O(3) metal-semiconductor nanowire heterostructures. A convergent electron beam generated in a transmission electron microscope is demonstrated to be an effective tool for delicate manipulation of encapsulated Sn nanowires. The Sn nanowires were gently cut apart (into two discrete fragments) and then completely separated and rejoined within Ga(2)O(3) ribbon-shaped tubes. These unconventional beta-Ga(2)O(3) tubes not only should enrich the well-established bank of nanostructured morphologies and extend the understanding of crystal growth at the nanoscale but also may have promise for the design of electron-beam-irradiation- or thermo-driven electrical switches.
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