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Articles 1 - 30 of 160
Full-Text Articles in Physical Sciences and Mathematics
Effect Of Tensile Load On The Actuation Performance Of Ph-Sensitive Hydrogels, Sina Naficy, Geoffrey M. Spinks
Effect Of Tensile Load On The Actuation Performance Of Ph-Sensitive Hydrogels, Sina Naficy, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
pH-responsive hydrogels are capable of converting chemical energy to mechanical work. To optimize their use as actuators, their response when operating against an external load must be fully characterized. Here, the actuation strain of a model pH-sensitive hydrogel as a function of different constant loads is studied. The experimental actuation strain, produced by switching the pH from 2 to 12, decreases significantly and monotonically with increasing initial tensile load. Two models are developed to predict the actuation strain as a function of applied stress. Simple mechanical models based on the change in hydrogel modulus and cross sectional area due to …
Size-Dependent Chemical Reactivity Of Silicon Nanocrystals With Water And Oxygen, Melanie L. Mastronardi, Kenneth K. Chen, Kristine Liao, Gilberto Casillas, Geoffrey A. Ozin
Size-Dependent Chemical Reactivity Of Silicon Nanocrystals With Water And Oxygen, Melanie L. Mastronardi, Kenneth K. Chen, Kristine Liao, Gilberto Casillas, Geoffrey A. Ozin
Australian Institute for Innovative Materials - Papers
A detailed investigation examines how the size of allylbenzene-capped silicon nanocrystals (ncSi:AB) affects their chemical reactivity with gaseous O2, H2O, and O2/H2O as probed by in situ luminescence spectroscopy. Specifically, changes in the photoluminescence (PL) of size-separated ncSi:AB are monitored through alterations of their PL absolute quantum yield (AQY) as well as the wavelength and intensity of their PL spectra over time. These experiments, conducted under both continuous and intermittent illumination, help elucidate the roles of O2, H2O, and mixtures of O2/H2O, with respect …
A Custom Battery For Operando Neutron Powder Diffraction Studies Of Electrode Structure, Wei Kong Pang, Vanessa Peterson
A Custom Battery For Operando Neutron Powder Diffraction Studies Of Electrode Structure, Wei Kong Pang, Vanessa Peterson
Australian Institute for Innovative Materials - Papers
Structure-property relations are central to understanding functional materials, and for battery research the use of neutron powder diffraction to reveal the atomistic and molecular-scale origin of battery performance characteristics is often essential. Although operando experiments of this kind are increasingly common as neutron sources and instrumentation advance, these experiments are hindered by the often large barrier presented by the preparation of whole batteries that yield a neutron diffraction signal from the electrode of interest that is sufficient to extract detailed structural information. This article presents a custom battery that is specifically designed for operando neutron powder diffraction. The battery is …
A Facile Approach To Synthesize Stable Cnts@Mno Electrocatalyst For High Energy Lithium Oxygen Batteries, Wenbin Luo, Shulei Chou, Jiazhao Wang, Yu-Chun Zhai, Hua-Kun Liu
A Facile Approach To Synthesize Stable Cnts@Mno Electrocatalyst For High Energy Lithium Oxygen Batteries, Wenbin Luo, Shulei Chou, Jiazhao Wang, Yu-Chun Zhai, Hua-Kun Liu
Australian Institute for Innovative Materials - Papers
A composite of manganese monoxide loaded onto carbon nanotubes (CNTs@MnO) has been synthesized by a facile approach, in which the CNTs form a continuous conductive network connecting the electrocatalyst MnO nanoparticles together to facilitate good electrochemical performance. The electrocatalyst MnO shows favourable rechargeability, and good phase and morphology stability in lithium oxygen batteries. Excellent cycling performance is also demonstrated, in which the terminal voltage is higher than 2.4 V after 100 cycles at 0.4 mA cm-2, with 1000 mAh g-1 (composite) capacity. Therefore, this hybrid material is promising for use as a cathode material for lithium oxygen …
Flexible Free-Standing Graphene Paper With Interconnected Porous Structure For Energy Storage, Kewei Shu, Caiyun Wang, Sha Li, Chen Zhao, Yang Yang, Hua-Kun Liu, Gordon G. Wallace
Flexible Free-Standing Graphene Paper With Interconnected Porous Structure For Energy Storage, Kewei Shu, Caiyun Wang, Sha Li, Chen Zhao, Yang Yang, Hua-Kun Liu, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
A novel porous graphene paper is prepared via freeze drying a wet graphene oxide gel, followed by thermal and chemical reduction. The macroscopic structure of the formed graphene paper can be tuned by the water content in the gel precursor. With 92% water content, an interconnected macroporous network can be formed. This porous graphene (PG) paper exhibits excellent electrochemical properties. It can deliver a high discharge capacity of 420 mA h g−1 at a current density of 2000 mA g−1 when used as binder-free lithium ion battery anode. PG paper exhibits a specific capacitance of 137 F g …
Controllable Synthesis Of Concave Cubic Gold Core-Shell Nanoparticles For Plasmon-Enhanced Photon Harvesting, Yang Bai, Teera Butburee, Hua Yu, Zhen Li, Rose Amal, Gao Qing (Max) Lu, Lianzhou Wang
Controllable Synthesis Of Concave Cubic Gold Core-Shell Nanoparticles For Plasmon-Enhanced Photon Harvesting, Yang Bai, Teera Butburee, Hua Yu, Zhen Li, Rose Amal, Gao Qing (Max) Lu, Lianzhou Wang
Australian Institute for Innovative Materials - Papers
Well-defined core-shell nanoparticles (NPs) containing concave cubic Au cores and TiO2 shells (CA@T) were synthesized in colloidal suspension. These CA@T NPs exhibit Localized Surface Plasmon Resonance (LSPR) absorption in the NIR region, which provides a unique property for utilizing the low energy range of the solar spectrum. In order to evaluate the plasmonic enhancement effect, a variety of CA@T NPs were incorporated into working electrodes of dye-sensitized solar cells (DSSCs). By adjusting the shell thickness of CA@T NPs, the plasmonic property can be tuned to achieve maximum photovoltaic improvement. Furthermore, the DSSC cells fabricated with the CA@T NPs exhibit …
Contribution Of Radicals And Ions In Catalyzed Growth Of Single-Walled Carbon Nanotubes From Low-Temperature Plasmas, Z Marvi, S Xu, G Foroutan, Kostya Ostrikov
Contribution Of Radicals And Ions In Catalyzed Growth Of Single-Walled Carbon Nanotubes From Low-Temperature Plasmas, Z Marvi, S Xu, G Foroutan, Kostya Ostrikov
Australian Institute for Innovative Materials - Papers
The growth kinetics of single-walled carbon nanotubes (SWCNTs) in a low-temperature, low-pressure reactive plasma is investigated using a multiscale numerical simulation, including the plasma sheath and surface diffusion modules. The plasma-related effects on the characteristics of SWCNT growth are studied. It is found that in the presence of reactive radicals in addition to energetic ions inside the plasma sheath area, the effective carbon flux, and the growth rate of SWCNT increase. It is shown that the concentration of atomic hydrogen and hydrocarbon radicals in the plasma plays an important role in the SWCNT growth. The effect of the effective carbon …
Contamination Mitigation Strategies For Scanning Transmission Electron Microscopy, David R. G Mitchell
Contamination Mitigation Strategies For Scanning Transmission Electron Microscopy, David R. G Mitchell
Australian Institute for Innovative Materials - Papers
Modern scanning transmission electron microscopy (STEM) enables imaging and microanalysis at very high magnification. In the case of aberration-corrected STEM, atomic resolution is readily achieved. However, the electron fluxes used may be up to three orders of magnitude greater than those typically employed in conventional STEM. Since specimen contamination often increases with electron flux, specimen cleanliness is a critical factor in obtaining meaningful data when carrying out high magnification STEM. A range of different specimen cleaning methods have been applied to a variety of specimen types. The contamination rate has been measured quantitatively to assess the effectiveness of cleaning. The …
N-Doped Crumpled Graphene Derived From Vapor Phase Deposition Of Ppy On Graphene Aerogel As An Efficient Oxygen Reduction Reaction Electrocatalyst, Meng Wang, Jiazhao Wang, Yuyang Hou, Dongqi Shi, David Wexler, Simon D. Poynton, Robert C.T. Slade, Weimin Zhang, Hua-Kun Liu, Jun Chen
N-Doped Crumpled Graphene Derived From Vapor Phase Deposition Of Ppy On Graphene Aerogel As An Efficient Oxygen Reduction Reaction Electrocatalyst, Meng Wang, Jiazhao Wang, Yuyang Hou, Dongqi Shi, David Wexler, Simon D. Poynton, Robert C.T. Slade, Weimin Zhang, Hua-Kun Liu, Jun Chen
Australian Institute for Innovative Materials - Papers
Nitrogen-doped crumpled graphene (NCG) is successfully synthesized via vapor phase deposition of polypyrrole onto graphene aerogel followed by thermal treatment. The NCG was explored as an electrocatalyst for the oxygen reduction reaction, showing comparable electrocatalytic performance with the commercial Pt/C in alkaline membrane exchange fuel cells because of the well-regulated nitrogen doping and the robust micro-3D crumpled porous nanostructure.
A Bi-Layer Tio2 Photoanode For Highly Durable, Flexible Dye-Sensitized Solar Cells, Jianjian Lin, Yong Peng, Alexander Pascoe, Fuzhi Huang, Yi-Bing Cheng, Yoon-Uk Heo, Andrew Nattestad, Wanchul Seung, Sung Kyun Kim, Hoon Joon Yoon, Sang Woo Kim, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
A Bi-Layer Tio2 Photoanode For Highly Durable, Flexible Dye-Sensitized Solar Cells, Jianjian Lin, Yong Peng, Alexander Pascoe, Fuzhi Huang, Yi-Bing Cheng, Yoon-Uk Heo, Andrew Nattestad, Wanchul Seung, Sung Kyun Kim, Hoon Joon Yoon, Sang Woo Kim, Yusuke Yamauchi, S X. Dou, Jung Ho Kim
Australian Institute for Innovative Materials - Papers
Low-temperature processing of dye-sensitized solar cells (DSCs) [B. Oregan, M. Grätzel, Nature, 1991, 353, 737] is crucial to enable their commercialization with low-cost plastic substrates. Much of the previous work in this area has focused on mechanical compression of premade particles on plastic substrates; however, many reported that this technique did not yield sufficient interconnections for high charge carrier transport. Herein, we present bi-layer photoanodes that incorporate microstructured TiO2 sea-urchin-like assemblies, composed of high-aspect-ratio single crystalline nanoribbons, i.e., two-dimensional subunits, which were deposited onto a nanoparticle layer (commercial P25), with a 5.6% conversion efficiency realized. We demonstrate that …
Large Entropy Change Accompanying Two Successive Magnetic Phase Transitions In Tbmn2si2 For Magnetic Refrigeration, Guoxing Li, Jianli Wang, Zhenxiang Cheng, Qing Yon Ren, Chunsheng Fang, S X. Dou
Large Entropy Change Accompanying Two Successive Magnetic Phase Transitions In Tbmn2si2 For Magnetic Refrigeration, Guoxing Li, Jianli Wang, Zhenxiang Cheng, Qing Yon Ren, Chunsheng Fang, S X. Dou
Australian Institute for Innovative Materials - Papers
Structural and magnetic properties in TbMn2Si2 are studied by variable temperature X-ray diffraction, magnetization, electrical resistivity, and heat capacity measurements. TbMn2Si2 undergoes two successive magnetic transitions at around Tc1 = 50 K and Tc2 = 64 K. Tc1 remains almost constant with increasing magnetic field, but Tc2 shifts significantly to higher temperature. Thus, there are two partially overlapping peaks in the temperature dependence of magnetic entropy change, i.e., −ΔSM (T). The different responses of Tc1 and Tc2 to external magnetic field, and the overlapping of −ΔSM …
Chemically Converted Graphene: Scalable Chemistries To Enable Processing And Fabrication, Sanjeev Gambhir, Rouhollah Jalili, David L. Officer, Gordon G. Wallace
Chemically Converted Graphene: Scalable Chemistries To Enable Processing And Fabrication, Sanjeev Gambhir, Rouhollah Jalili, David L. Officer, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Graphene, a nanocarbon with exceptional physical and electronic properties, has the potential to be utilized in a myriad of applications and devices. However, this will only be achieved if scalable, processable forms of graphene are developed along with ways to fabricate these forms into material structures and devices. In this review, we provide a comprehensive overview of the chemistries suitable for the development of aqueous and organic solvent graphene dispersions and their use for the preparation of a variety of polymer composites, materials useful for the fabrication of graphene-containing structures and devices. Fabrication of the processable graphene dispersions or composites …
Giant Enhancement In Critical Current Density, Up To A Hundredfold, In Superconducting Nafe0.97co0.03 As Single Crystals Under Hydrostatic Pressure, Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani, A-Li Wang, S X. Dou, X.H Chen
Giant Enhancement In Critical Current Density, Up To A Hundredfold, In Superconducting Nafe0.97co0.03 As Single Crystals Under Hydrostatic Pressure, Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani, A-Li Wang, S X. Dou, X.H Chen
Australian Institute for Innovative Materials - Papers
Tremendous efforts towards improvement in the critical current density "Jc" of iron based superconductors (FeSCs), especially at relatively low temperatures and magnetic fields, have been made so far through different methods, resulting in real progress. Jc at high temperatures in high fields still needs to be further improved, however, in order to meet the requirements of practical applications. Here, we demonstrate a simple approach to achieve this. Hydrostatic pressure can significantly enhance Jc in NaFe0.97Co0.03As single crystals by at least tenfold at low field and more than a hundredfold at high fields. …
Enhanced Electron Lifetime Of Cdse/Cds Quantum Dot (Qd) Sensitized Solar Cells Using Znse Core-Shell Structure With Efficient Regeneration Of Quantum Dots, Rasin K. Ahmed, Long Zhao, Attila J. Mozer, Geoffrey D. Will, John M. Bell, Hongxia Wang
Enhanced Electron Lifetime Of Cdse/Cds Quantum Dot (Qd) Sensitized Solar Cells Using Znse Core-Shell Structure With Efficient Regeneration Of Quantum Dots, Rasin K. Ahmed, Long Zhao, Attila J. Mozer, Geoffrey D. Will, John M. Bell, Hongxia Wang
Australian Institute for Innovative Materials - Papers
Research on development of efficient passivation materials for high performance and stable quantum dot sensitized solar cells (QDSCs) is highly important. While ZnS is one of the most widely used passivation material in QDSCs, an alternative material based on ZnSe which was deposited on CdS/CdSe/TiO2 photoanode to form a semi-core/shell structure has been found to be more efficient in terms of reducing electron recombination in QDSCs in this work. It has been found that the solar cell efficiency was improved from 1.86% for ZnSe0 (without coating) to 3.99% using 2 layers of ZnSe coating (ZnSe2) deposited by successive ionic …
Strain-Induced Magnetic Phase Transition In Srcoo3−Δ Thin Films, S J. Callori, S Hu, Joel Bertinshaw, Zhilian Yue, S Danilkin, Xiaolin Wang, V Nagarajan, Frank Klose, Jan Seidel, Clemens Ulrich
Strain-Induced Magnetic Phase Transition In Srcoo3−Δ Thin Films, S J. Callori, S Hu, Joel Bertinshaw, Zhilian Yue, S Danilkin, Xiaolin Wang, V Nagarajan, Frank Klose, Jan Seidel, Clemens Ulrich
Australian Institute for Innovative Materials - Papers
It has been well established that both in bulk at ambient pressure and for films under modest strains, cubic SrCoO3−δ (δ<0.2) is a ferromagnetic metal. Recent theoretical work, however, indicates that a magnetic phase transition to an antiferromagnetic structure could occur under large strain accompanied by a metal-insulator transition. We have observed a strain-induced ferromagnetic-to-antiferromagnetic phase transition in SrCoO3−δ films grown on DyScO3 substrates, which provide a large tensile epitaxial strain, as compared to ferromagnetic films under lower tensile strain on SrTiO3 substrates. Magnetometry results demonstrate the existence of antiferromagnetic spin correlations and neutron diffraction experiments provide a direct evidence for a G-type antiferromagnetic structure with Neél temperatures between TN∼135±10K and ∼325±10K, depending on the oxygen content of the samples. Therefore, our data experimentally confirm the predicted strain-induced magnetic phase transition to an antiferromagnetic state for SrCoO3−δ thin films under large epitaxial strain.
Effective Enhancement Of The Electrochemical Performance Of Layered Cathode Li1.5mn0.75ni0.25o2.5 Via A Novel Facile Molten Salt Method, Zhuo Zheng, Wei-Bo Hua, S Liao, Yan Jun Zhong, En-Hui Wang, Bin-Bin Xu, Hua-Kun Liu, Ben-He Zhong
Effective Enhancement Of The Electrochemical Performance Of Layered Cathode Li1.5mn0.75ni0.25o2.5 Via A Novel Facile Molten Salt Method, Zhuo Zheng, Wei-Bo Hua, S Liao, Yan Jun Zhong, En-Hui Wang, Bin-Bin Xu, Hua-Kun Liu, Ben-He Zhong
Australian Institute for Innovative Materials - Papers
A series of nanocrystalline lithium-rich cathode materials Li1.5Mn0.75Ni0.25O2.5 have been prepared by a novel synthetic process, which combines the co-precipitation method and a modified molten salt method. By using a moderate excess of 0.5LiNO3-0.5LiOH eutectic salts as molten media and reactants, the usage of deionized water or alcohol in the subsequent wash process is successfully reduced, compared with the traditional molten salt method. The materials with different excess Li salt content, Li/M (M = Ni + Mn) = 1.55, 1.65, 1.75, 1.85, 1.95, 2.05, molar ratio, show distinct differences in their …
Ferroelectric And Magnetic Properties Of Aurivillius Bim+1ti3fem−3o3m+3 Thin Films, Tingting Jia, Hideo Kimura, Zhenxiang Cheng, Hongyang Zhao
Ferroelectric And Magnetic Properties Of Aurivillius Bim+1ti3fem−3o3m+3 Thin Films, Tingting Jia, Hideo Kimura, Zhenxiang Cheng, Hongyang Zhao
Australian Institute for Innovative Materials - Papers
Aurivillius Bim+1Ti3Fem−3O3m+3 (m = 4, 5, 6) thin films have been deposited by a pulsed laser deposition system. The x-ray diffraction patterns indicate the formation of orthorhombic phase. The remanent polarization (2Pr) of Bim+1Ti3Fem−3O3m+3 thin films is decreased with the m-number. Positive-up-negative-down measurements indicate the presence of ferroelectric (FE) polarization in as-obtained thin films. Piezoresponse force microscopy investigations confirm the existence of FE domains and the switchable polarization. Weak magnetic moment is detected in the Aurivillius films at room temperature. The present work …
Superior Critical Current Density Obtained In Mg11b2 Low Activation Superconductor By Using Reactive Amorphous 11b And Optimizing Sintering Temperature, Fang Cheng, Yongchang Liu, Zongqing Ma, Huijun Li, Md Shahriar Hossain
Superior Critical Current Density Obtained In Mg11b2 Low Activation Superconductor By Using Reactive Amorphous 11b And Optimizing Sintering Temperature, Fang Cheng, Yongchang Liu, Zongqing Ma, Huijun Li, Md Shahriar Hossain
Australian Institute for Innovative Materials - Papers
The un-doped Mg11B2 and Cu-doped Mg11B2 bulks using 11B as a boron precursor were fabricated by solid-state reaction and sintered at different temperature in present work. By analyzing the sintering process, it was found that 11B original powder is more reactive and can react with Mg severely even at low temperature before Mg melting, which leads to the formation of refined Mg11B2 grains. Consequently, the critical current density of Mg11B2 sample prepared in this work is higher than that of natural MgB2. Furthermore, it was found that proper Cu addition …
Probe Current Determination In Analytical Tem/Stem And Its Application To The Characterization Of Large Area Eds Detectors, David R. G Mitchell, Mitchell John Bromley Nancarrow
Probe Current Determination In Analytical Tem/Stem And Its Application To The Characterization Of Large Area Eds Detectors, David R. G Mitchell, Mitchell John Bromley Nancarrow
Australian Institute for Innovative Materials - Papers
A simple procedure, which enables accurate measurement of transmission electron microscopy (TEM)/STEM probe currents using an energy loss spectrometer drift tube is described. The currents obtained are compared with those measured on the fluorescent screen to enable the losses due to secondary and backscattered electrons to be determined. The current values obtained from the drift tube allow the correction of fluorescent screen current densities to yield true current. They also enable CCD conversion efficiencies to be obtained, which in turn allows images to be calibrated in terms of electron fluence. Using probes of known current in conjunction with a NiO …
Robust Scalable Synthesis Of Surfactant-Free Thermoelectric Metal Chalcogenide Nanostructures, Chao Han, Zhen Li, Gao Qing (Max) Lu, S X. Dou
Robust Scalable Synthesis Of Surfactant-Free Thermoelectric Metal Chalcogenide Nanostructures, Chao Han, Zhen Li, Gao Qing (Max) Lu, S X. Dou
Australian Institute for Innovative Materials - Papers
A robust low-cost ambient aqueous method for the scalable synthesis of surfactant-free nanostructured metal chalcogenides (MaXb, M=Cu, Ag, Sn, Pb, and Bi; X=S, Se, and Te; a=1 or 2; and b=1 or 3) is developed in this work. The effects of reaction parameters, such as precursor concentration, ratio of precursors, and amount of reducing agent, on the composition, size, and shape of the resultant nanostructures have been comprehensively investigated. This environmentally friendly approach is capable of producing metal chalcogenide nanostructures in a one-pot reaction on a large scale, which were investigated for their thermoelectric properties towards conversion of waste heat …
The Codes Of Matter And Their Applications, Xiaolin Wang
The Codes Of Matter And Their Applications, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
The elements in the periodic table are the building blocks used to form substances with different compositions. Nevertheless, it is the properties of substances that are decisive for their existence and practical applications. Searching for new class of materials with exotic properties has always been challenging because of the complexity of both the theoretical and the experimental approaches developed so far. Here, we propose that the three ubiquitous and paramount attributes of all existing matter charge (Q), spin (S) or rotational motion, and linear motion (K) can be used to account for the formation of different types of matter/materials and …
An Intermediate Band Dye-Sensitised Solar Cell Using Triplet-Triplet Annihilation, Catherine Simpson, Tracey M. Clarke, Rowan W. Macqueen, Yuen Yap Cheng, Adam J. Trevitt, Attila J. Mozer, Pawel W. Wagner, Timothy W. Schmidt, Andrew Nattestad
An Intermediate Band Dye-Sensitised Solar Cell Using Triplet-Triplet Annihilation, Catherine Simpson, Tracey M. Clarke, Rowan W. Macqueen, Yuen Yap Cheng, Adam J. Trevitt, Attila J. Mozer, Pawel W. Wagner, Timothy W. Schmidt, Andrew Nattestad
Australian Institute for Innovative Materials - Papers
A new mechanism of charge photogeneration is demonstrated for the first time, based on organic molecular structures. This intermediate band approach, integrated into a dye-sensitised solar cell configuration is shown to generate charges upon illumination with low energy photons. Specifically 610 nm photoexcitation of Pt porphyrins, through a series of energy transfer steps and triplet-triplet annihilation, excites a higher energy absorption onset molecule, which is then capable of charge injection into TiO2. Transient absorption measurements reveal further detail of the processes involved.
A Decaheme Cytochrome As A Molecular Electron Conduit In Dye-Sensitized Photoanodes, Ee Taek Hwang, Khizar Sheikh, Katherine L. Orchard, Daisuke Hojo, Valentin Radu, Chong-Yong Lee, Emma Ainsworth, Colin Lockwood, Manuela A. Gross, Tadafumi Adschiri, Erwin Reisner, Julea N. Butt, Lars J. C Jeuken
A Decaheme Cytochrome As A Molecular Electron Conduit In Dye-Sensitized Photoanodes, Ee Taek Hwang, Khizar Sheikh, Katherine L. Orchard, Daisuke Hojo, Valentin Radu, Chong-Yong Lee, Emma Ainsworth, Colin Lockwood, Manuela A. Gross, Tadafumi Adschiri, Erwin Reisner, Julea N. Butt, Lars J. C Jeuken
Australian Institute for Innovative Materials - Papers
In nature, charge recombination in light-harvesting reaction centers is minimized by efficient charge separation. Here, it is aimed to mimic this by coupling dye-sensitized TiO2 nanocrystals to a decaheme protein, MtrC from Shewanella oneidensis MR-1, where the 10 hemes of MtrC form a ≈7-nm-long molecular wire between the TiO2 and the underlying electrode. The system is assembled by forming a densely packed MtrC film on an ultra-flat gold electrode, followed by the adsorption of approximately 7 nm TiO2 nanocrystals that are modified with a phosphonated bipyridine Ru(II) dye (RuP). The step-by-step construction of the MtrC/TiO2 system is monitored with (photo)electrochemistry, …
Multiple Fermi Pockets Revealed By Shubnikov-De Haas Oscillations In Wte2, Feixiang Xiang, Menno Veldhorst, S X. Dou, Xiaolin Wang
Multiple Fermi Pockets Revealed By Shubnikov-De Haas Oscillations In Wte2, Feixiang Xiang, Menno Veldhorst, S X. Dou, Xiaolin Wang
Australian Institute for Innovative Materials - Papers
The recently discovered non-saturating and parabolic magnetoresistance and the pressure-induced superconductivity at low temperature in WTe2 imply its rich electronic structure and possible practical applications. Here we use magnetotransport measurements to investigate the electronic structure of WTe2 single crystals. A non-saturating and parabolic magnetoresistance is observed from low temperature to high temperature up to 200 K with magnetic fields up to 8 T. Shubnikov-de Haas (SdH) oscillations with beating patterns are observed, the fast Fourier transform of which reveals three oscillation frequencies, corresponding to three pairs of Fermi pockets with comparable effective masses, m∗∼0.31 me. By fitting the Hall resistivity, …
Mechanism Of Periodic Height Variations Along Self-Aligned Vls-Grown Planar Nanostructures, Julian Steele, Josip Horvat, Roger A. Lewis, M Henini, D. Fan, Yu. I. Mazur, V G. Dorogan, P C. Grant, S.-Q Yu, G J. Salamo
Mechanism Of Periodic Height Variations Along Self-Aligned Vls-Grown Planar Nanostructures, Julian Steele, Josip Horvat, Roger A. Lewis, M Henini, D. Fan, Yu. I. Mazur, V G. Dorogan, P C. Grant, S.-Q Yu, G J. Salamo
Australian Institute for Innovative Materials - Papers
In this study we report in-plane nanotracks produced by molecular-beam-epitaxy (MBE) exhibiting lateral self-assembly and unusual periodic and out-of-phase height variations across their growth axes. The nanotracks are synthesized using bismuth segregation on the GaAsBi epitaxial surface, which results in metallic liquid droplets capable of catalyzing GaAsBi nanotrack growth via the vapor-liquid-solid (VLS) mechanism. A detailed examination of the nanotrack morphologies is carried out employing a combination of scanning electron and atomic force microscopy and, based on the findings, a geometric model of nanotrack growth during MBE is developed. Our results indicate diffusion and shadowing effects play significant roles in …
3d Fe2(Moo4)3 Microspheres With Nanosheet Constituents As High-Capacity Anode Materials For Lithium-Ion Batteries, Hao Zheng, Shiqiang Wang, Jiazhao Wang, Jun Wang, Lin Li, Yun Yang, Chuanqi Feng, Ziqi Sun
3d Fe2(Moo4)3 Microspheres With Nanosheet Constituents As High-Capacity Anode Materials For Lithium-Ion Batteries, Hao Zheng, Shiqiang Wang, Jiazhao Wang, Jun Wang, Lin Li, Yun Yang, Chuanqi Feng, Ziqi Sun
Australian Institute for Innovative Materials - Papers
Three-dimensional (3D) Fe2(MoO4)3 microspheres with ultrathin nanosheet constituents are first synthesized as anode materials for the lithium-ion battery. It is interesting that the single-crystalline nanosheets allow rapid electron/ion transport on the inside, and the high porosity ensures fast diffusion of liquid electrolyte in energy storage applications. The electrochemical properties of Fe2(MoO4)3 as anode demonstrates that 3D Fe2(MoO4)3 microspheres deliver an initial capacity of 1855 mAh/g at a current density of 100 mA/g. Particularly, when the current density is increased to 800 mA/g, the reversible capacity of Fe2(MoO4)3 anode still arrived at 456 mAh/g over 50 cycles. The large and reversible …
A Facile Approach For Fabrication Of Mechanically Strong Graphene/Polypyrrole Films With Large Areal Capacitance For Supercapacitor Applications, Yu Ge, Caiyun Wang, Kewei Shu, Chen Zhao, Xiaoteng Jia, Sanjeev Gambhir, Gordon G. Wallace
A Facile Approach For Fabrication Of Mechanically Strong Graphene/Polypyrrole Films With Large Areal Capacitance For Supercapacitor Applications, Yu Ge, Caiyun Wang, Kewei Shu, Chen Zhao, Xiaoteng Jia, Sanjeev Gambhir, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Substantial progress has been made in free-standing flexible graphene-based films for flexible supercapacitors. However, there are limited reports on the areal capacitance of these electrodes, which is an important parameter for practical applications, especially in miniaturized electronic devices. Herein we report the facile fabrication of robust flexible graphene/polypyrrole nanoparticle films. PPy NPs act as the "spacer" between graphene layers creating hierarchical structures. This free-standing film shows excellent mechanical properties with a fracture strength of 16.89 MPa and Young's modulus of 11.77 MPa. The resulting film electrode delivers a large areal specific capacitance of 216 mF cm−2, which is higher or …
One Dimensional Graphitic Carbon Nitrides As Effective Metal-Free Oxygen Reduction Catalysts, Muhammad Nawaz Tahir, Nasir Mahmood, Jinghan Zhu, Asif Mahmood, Faheem K. Butt, Syed Rizwan, Imran Aslam, M Tanveer, Faryal Idrees, Imran Shakir, Chuanbao Cao, Yanglong Hou
One Dimensional Graphitic Carbon Nitrides As Effective Metal-Free Oxygen Reduction Catalysts, Muhammad Nawaz Tahir, Nasir Mahmood, Jinghan Zhu, Asif Mahmood, Faheem K. Butt, Syed Rizwan, Imran Aslam, M Tanveer, Faryal Idrees, Imran Shakir, Chuanbao Cao, Yanglong Hou
Australian Institute for Innovative Materials - Papers
To explore the effect of morphology on catalytic properties of graphitic carbon nitride (GCN), we have studied oxygen reduction reaction (ORR) performance of two different morphologies of GCN in alkaline media. Among both, tubular GCN react with dissolved oxygen in the ORR with an onset potential close to commercial Pt/C. Furthermore, the higher stability and excellent methanol tolerance of tubular GCN compared to Pt/C emphasizes its suitability for fuel cells.
Crystalline Tio2@C Nanosheet Anode With Enhanced Rate Capability For Lithium-Ion Batteries, Fan Yang, Yuxuan Zhu, Xiu Li, Chao Lai, Wei Guo, Jianmin Ma
Crystalline Tio2@C Nanosheet Anode With Enhanced Rate Capability For Lithium-Ion Batteries, Fan Yang, Yuxuan Zhu, Xiu Li, Chao Lai, Wei Guo, Jianmin Ma
Australian Institute for Innovative Materials - Papers
TiO2@C nanosheets have been obtained by a facile solvothermal method using titanate butoxide and hydrofluoric acid as precursors, followed by our novel carbon coating technique using oleic acid as the carbon source. The TiO2@C nanosheet anode shows a high discharge capacity of 145.8 mA h g-1 after 50 cycles and excellent rate capability.
Electroactive Biocompatible Materials For Nerve Cell Stimulation, Mei Yang, Youlong Liang, Qingyuan Gui, Jun Chen, Yong Liu
Electroactive Biocompatible Materials For Nerve Cell Stimulation, Mei Yang, Youlong Liang, Qingyuan Gui, Jun Chen, Yong Liu
Australian Institute for Innovative Materials - Papers
In the past decades, great efforts have been developed for neurobiologists and neurologists to restore nervous system functions. Recently much attention has been paid to electrical stimulation (ES) of the nervous system as a potential way to repair it. Various conductive biocompatible materials with good electrical conductivity, biocompatibility, and long-term ES or electrical stability have been developed as the substrates for ES. In this review, we summarized different types of materials developed in the purpose for ES of nervous system, including conducting polymers, carbon nanomaterials and composites from conducting polymer/carbon nanomaterials. The present review will give our perspective on the …