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2014

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Articles 10741 - 10770 of 12299

Full-Text Articles in Physical Sciences and Mathematics

Tuning Three-Dimensional Tio2 Nanotube Electrode To Achieve High Utilization Of Ti Substrate For Lithium Storage, Zhijia Zhang, Qing-Yi Zeng, Shulei Chou, Xinjun Li, Huijun Li, Kiyoshi Ozawa, Hua-Kun Liu, Jiazhao Wang Jan 2014

Tuning Three-Dimensional Tio2 Nanotube Electrode To Achieve High Utilization Of Ti Substrate For Lithium Storage, Zhijia Zhang, Qing-Yi Zeng, Shulei Chou, Xinjun Li, Huijun Li, Kiyoshi Ozawa, Hua-Kun Liu, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

Three-dimensional (3D) TiO2 nanotube arrays grown on Ti mesh were prepared via the anodization process. The diameters of the Ti and TiO 2/Ti wires and the length of the TiO2 nanotubes have linear relationships with the anodization processing time. When the anodization processing time is 600 min, the TiO2/Ti mesh anode materials showed good capacity retention and high specific area capacity, without the need for a current collector or binder, due to their high surface area, high substrate utilization, and large active material loading rate per unit area. At the current density of 50 μA cm-2, TiO2/Ti mesh with 600 …

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Highly Conductive Carbon Nanotube-Graphene Hybrid Yarn, Javad Foroughi, Geoffrey M. Spinks, Dennis Antiohos, Azadehsadat Mirabedini, Sanjeev Gambhir, Gordon G. Wallace, Shaban Reza Ghorbani, Germanas Peleckis, Mikhail Kozlov, Marcio Lima, Ray Baughman Jan 2014

Highly Conductive Carbon Nanotube-Graphene Hybrid Yarn, Javad Foroughi, Geoffrey M. Spinks, Dennis Antiohos, Azadehsadat Mirabedini, Sanjeev Gambhir, Gordon G. Wallace, Shaban Reza Ghorbani, Germanas Peleckis, Mikhail Kozlov, Marcio Lima, Ray Baughman

Australian Institute for Innovative Materials - Papers

An efficient procedure for the fabrication of highly conductive carbon nanotube/graphene hybrid yarns has been developed. To start, arrays of vertically aligned multi-walled carbon nanotubes (MWNT) are converted into indefinitely long MWNT sheets by drawing. Graphene flakes are then deposited onto the MWNT sheets by electrospinning to form a composite structure that is transformed into yarn filaments by twisting. The process is scalable for yarn fabrication on an industrial scale. Prepared materials are characterized by electron microscopy, electrical, mechanical, and electrochemical measurements. It is found that the electrical conductivity of the composite MWNT-graphene yarns is over 900 S/cm. This value …

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Cuo Single Crystal With Exposed {001} Facets-A Highly Efficient Material For Gas Sensing And Li-Ion Battery Applications, Dawei Su, Xiuqiang Xie, S X. Dou, Guoxiu Wang Jan 2014

Cuo Single Crystal With Exposed {001} Facets-A Highly Efficient Material For Gas Sensing And Li-Ion Battery Applications, Dawei Su, Xiuqiang Xie, S X. Dou, Guoxiu Wang

Australian Institute for Innovative Materials - Papers

Single crystal copper oxide nanoplatelets with a high percentage of {001} facets were synthesized by a facile hydrothermal approach. The as-prepared materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and high resolution transmission microscopy. Via density functional theory calculations, it was found that the {001} facets are active crystal planes. When the single crystal CuO nanoplatelets were applied as an anode material in Li-ion batteries, they demonstrated outstanding electrochemical performance with high lithium storage capacity, satisfactory cyclability, and excellent high rate capacity. When used as a sensing material in gas sensors, they exhibited …

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Edge-Enriched Graphene Quantum Dots For Enhanced Photo-Luminescence And Supercapacitance, Mahbub Hassan, Enamul Haque, Kakarla Raghava Reddy, Andrew I. Minett, Jun Chen, Vincent G. Gomes Jan 2014

Edge-Enriched Graphene Quantum Dots For Enhanced Photo-Luminescence And Supercapacitance, Mahbub Hassan, Enamul Haque, Kakarla Raghava Reddy, Andrew I. Minett, Jun Chen, Vincent G. Gomes

Australian Institute for Innovative Materials - Papers

Graphene quantum dots (GQDs) with their edge-bound nanometer-size present distinctive properties owing to quantum confinement and edge effects. We report a facile ultrasonic approach with chemical activation using KOH to prepare activated GQDs or aGQDs enriched with both free and bound edges. Compared to GQDs, the aGQDs we synthesized had enhanced BET surface area by a factor of about six, the photoluminescence intensity by about four and half times and electro-capacitance by a factor of about two. Unlike their non-activated counterparts, the aGQDs having enhanced edge states emit enhanced intense blue luminescence and exhibit electrochemical double layer capacitance greater than …

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Design Considerations In Mgb2-Based Superconducting Coils For Use In Saturated-Core Fault Current Limiters, Jonathan Knott, Philip A. Commins, Jeffrey Moscrop, S X. Dou Jan 2014

Design Considerations In Mgb2-Based Superconducting Coils For Use In Saturated-Core Fault Current Limiters, Jonathan Knott, Philip A. Commins, Jeffrey Moscrop, S X. Dou

Australian Institute for Innovative Materials - Papers

Saturated-core fault current limiters (FCLs) are devices that have many applications and potential for use within power networks. At a commercial scale, these devices require high H-field magnets to saturate the steel core, which can typically only be achieved through the use of superconducting coils. Here, we present several challenges that arise in the application of superconducting coils in FCLs and discuss how to address these issues through a case study MgB2-based coil. It is found that significant ac magnetic fields, Lorentz forces, and Joule heating in components occur during normal and fault operations; however, these issues can be mitigated …

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3-Dimensional (3d) Fabricated Polymer Based Drug Delivery Systems, Simon Moulton, Gordon G. Wallace Jan 2014

3-Dimensional (3d) Fabricated Polymer Based Drug Delivery Systems, Simon Moulton, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Drug delivery from 3-dimensional (3D) structures is a rapidly growing area of research. It is essential to achieve structures wherein drug stability is ensured, the drug loading capacity is appropriate and the desired controlled release profile can be attained. Attention must also be paid to the development of appropriate fabrication machinery that allows 3D drug delivery systems (DDS) to be produced in a simple, reliable and reproducible manner. The range of fabrication methods currently being used to form 3D DDSs include electrospinning (solution and melt), wet-spinning and printing (3-dimensional). The use of these techniques enables production of DDSs from the …

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Complementary Terahertz Absorption And Inelastic Neutron Study Of The Dynamic Anisotropy Contribution To Zone-Center Spin Waves In A Canted Antiferromagnet Ndfeo3, Evan Constable, David L. Cortie, Josip Horvat, Roger A. Lewis, Zhenxiang Cheng, Guochu Deng, Shixun Cao, Shujuan Yuan, Guohong Ma Jan 2014

Complementary Terahertz Absorption And Inelastic Neutron Study Of The Dynamic Anisotropy Contribution To Zone-Center Spin Waves In A Canted Antiferromagnet Ndfeo3, Evan Constable, David L. Cortie, Josip Horvat, Roger A. Lewis, Zhenxiang Cheng, Guochu Deng, Shixun Cao, Shujuan Yuan, Guohong Ma

Australian Institute for Innovative Materials - Papers

We employ a combination of pulsed- and continuous-wave polarized terahertz spectroscopy techniques to probe temperature-dependent spin waves in the antiferromagnet NdFeO3. Our optical data span 1.6-467 K and reveal a conspicuous spin reorientation between 110 and 170 K, during which the lower-energy mode softens completely. Complementary inelastic neutron scattering reveals that the frequencies of the optically excited spin waves are consistent with a temperature-variable spin gap in the low-energy spin-wave dispersion of NdFeO3. The result links the temperature dependence of the spin waves to a dynamic in-plane anisotropy. The magnetic anisotropy is calculated based on the results of the optical …

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Influence Of Capping On The Atomistic Arrangement In Palladium Nanoparticles At Room Temperature, Gaston Corthey, Jimena A. Olmos-Asar, Gilberto Casillas, Marcelo M. Mariscal, Sergio Mejia-Rosales, Julio C. Azcarate, Eduardo Larios, Miguel Jose-Yacaman, Roberto Salvarezza, M Fonticelli Jan 2014

Influence Of Capping On The Atomistic Arrangement In Palladium Nanoparticles At Room Temperature, Gaston Corthey, Jimena A. Olmos-Asar, Gilberto Casillas, Marcelo M. Mariscal, Sergio Mejia-Rosales, Julio C. Azcarate, Eduardo Larios, Miguel Jose-Yacaman, Roberto Salvarezza, M Fonticelli

Australian Institute for Innovative Materials - Papers

The role that protecting molecules have on the way that palladium atoms arrange themselves in nanoparticles prepared at room temperature was studied by the analysis of aberration-corrected scanning transmission electron microscopy images and atomistic Langevin dynamics simulations. It was found that the arrangement of Pd atoms is less ordered in thiolate-protected nanoparticles than in amine-protected ones. The experimental and theoretical data showed that the disorder in ∼3 nm thiolate-protected particles is promoted by the strong S-Pd bond in the sulfide layer that surrounds the nanoparticles.

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Mesoporous Hexagonal Co3o4 For High Performance Lithium Ion Batteries, Dawei Su, Xiuqiang Xie, Paul Munroe, S X. Dou, Guoxiu Wang Jan 2014

Mesoporous Hexagonal Co3o4 For High Performance Lithium Ion Batteries, Dawei Su, Xiuqiang Xie, Paul Munroe, S X. Dou, Guoxiu Wang

Australian Institute for Innovative Materials - Papers

Mesoporous Co3O4 nanoplates were successfully prepared by the conversion of hexagonal beta-Co(OH)(2) nanoplates. TEM, HRTEM and N-2 sorption analysis confirmed the facet crystal structure and inner mesoporous architecture. When applied as anode materials for lithium storage in lithium ion batteries, mesoporous Co3O4 nanocrystals delivered a high specific capacity. At 10 degrees C current rate, as-prepared mesoporous Co3O4 nanoplates delivered a specific capacity of 1203 mAh/g at first cycle and after 200 cycles it can still maintain a satisfied value (330 mAh/g). Fromex-situ TEM, SAED and FESEM observation, it was found that mesoporous Co3O4 nanoplates were reduced to Li2O and Co …

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Highly Oriented Lifepo4 Thin Film Electrodes Via Chemical Solution Deposition, Qi Li, Shulei Chou, Jiazhao Wang, Dongqi Shi, Hua-Kun Liu Jan 2014

Highly Oriented Lifepo4 Thin Film Electrodes Via Chemical Solution Deposition, Qi Li, Shulei Chou, Jiazhao Wang, Dongqi Shi, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

Highly oriented LiFePO4 thin-film electrodes were fabricated via chemical solution deposition combined with spin coating. The effects of the precursor concentrations and types of substrates on microstructures and electrochemical performances were studied. Single-phase LiFePO4 with orientations perpendicular to the (211)/(020) and (311) planes prepared using stainless steel as substrate presents the capacity of 4.9 μAh•cm-2 and the apparent activation energy of 59.2 kJ•mol-1, indicating its great potential to be used as cathode material for lithium thin film batteries.

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A New Strategy For Integrating Abundant Oxygen Functional Groups Into Carbon Felt Electrode For Vanadium Redox Flow Batteries, Ki Jae Kim, Seung-Wook Lee, Taeeun Yim, Jae-Geun Kim, Jang Wook Choi, Jung Ho Kim, Min-Sik Park, Young-Jun Kim Jan 2014

A New Strategy For Integrating Abundant Oxygen Functional Groups Into Carbon Felt Electrode For Vanadium Redox Flow Batteries, Ki Jae Kim, Seung-Wook Lee, Taeeun Yim, Jae-Geun Kim, Jang Wook Choi, Jung Ho Kim, Min-Sik Park, Young-Jun Kim

Australian Institute for Innovative Materials - Papers

The effects of surface treatment combining corona discharge and hydrogen peroxide (H2O2) on the electrochemical performance of carbon felt electrodes for vanadium redox flow batteries (VRFBs) have been thoroughly investigated. A high concentration of oxygen functional groups has been successfully introduced onto the surface of the carbon felt electrodes by a specially designed surface treatment, which is mainly responsible for improving the energy efficiency of VRFBs. In addition, the wettability of the carbon felt electrodes also can be significantly improved. The energy efficiency of the VRFB cell employing the surface modified carbon felt electrodes is improved by 7% at high …

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Tio2 Coated Three-Dimensional Hierarchically Ordered Porous Sulfur Electrode For The Lithium/Sulfur Rechargeable Batteries, Hongqiang Wang, Sha Li, Dan Li, Zhixin Chen, Hua-Kun Liu, Zaiping Guo Jan 2014

Tio2 Coated Three-Dimensional Hierarchically Ordered Porous Sulfur Electrode For The Lithium/Sulfur Rechargeable Batteries, Hongqiang Wang, Sha Li, Dan Li, Zhixin Chen, Hua-Kun Liu, Zaiping Guo

Australian Institute for Innovative Materials - Papers

A three-dimensional (3D) hierarchically ordered mesoporous carbon-sulfur composite slice coated with a thin TiO2 layer has been synthesized by a low-cost process and investigated as a cathode for the lithium-sulfur batteries. The TiO2 coated carbon sulfur composite thin slice works as a binder-free cathode without any current collectors for lithium-sulfur batteries. The hierarchical architecture provides a 3D conductive network for electron transfer, open channels for ion diffusion and strong confinement of soluble polysulfides. Meanwhile, TiO2 (titanium dioxide) coating layer could further effectively prevent the dissolution of polysulfides and also improve the strength of the entire electrode, thereby enhancing the electrochemical …

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Tuning The Band Gap In Silicene By Oxidation, Yi Du, Jincheng Zhuang, Hongsheng Liu, Xun Xu, Stefan Eilers, Kehui Wu, Peng Cheng, Jijun Zhao, Xiaodong Pi, Khay Wai See, Germanas Peleckis, Xiaolin Wang, S X. Dou Jan 2014

Tuning The Band Gap In Silicene By Oxidation, Yi Du, Jincheng Zhuang, Hongsheng Liu, Xun Xu, Stefan Eilers, Kehui Wu, Peng Cheng, Jijun Zhao, Xiaodong Pi, Khay Wai See, Germanas Peleckis, Xiaolin Wang, S X. Dou

Australian Institute for Innovative Materials - Papers

Silicene monolayers grown on Ag(111) surfaces demonstrate a band gap that is tunable by oxygen adatoms from semimetallic to semiconducting type. With the use of low-temperature scanning tunneling microscopy, we find that the adsorption configurations and amounts of oxygen adatoms on the silicene surface are critical for band gap engineering, which is dominated by different buckled structures in √13 x √13, 4 x 4, and 2√3 x 2√3 silicene layers. The Si-O-Si bonds are the most energy-favored species formed on √13 x √13, 4 x 4, and 2√3 x 2√3 structures under oxidation, which is verified by in situ Raman …

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A Novel Codoping Approach For Enhancing The Performance Of Polypyrrole Cathode In A Bioelectric Battery, Yang Yang, Caiyun Wang, Chunming Zhang, Dan Wang, Dannong He, Gordon G. Wallace Jan 2014

A Novel Codoping Approach For Enhancing The Performance Of Polypyrrole Cathode In A Bioelectric Battery, Yang Yang, Caiyun Wang, Chunming Zhang, Dan Wang, Dannong He, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

A conducting polymer (CP) based bioelectric battery provides a promising alternative to commercial lithium batteries to drive biomedical devices. However, the low power density limits practical application. Here, we synthesize a polypyrrole (PPy)/anthraquinone sulfonate (AQS)/reduced graphene oxide (r-GO) composite via a facile electrochemical route, and use this as a novel cathode material for bioelectric batteries. The presence of r-GO significantly enhanced the electrochemical properties of PPy and led to greatly improved cell performance compared to that of PPy/AQS. The resultant PPy/AQS/r-GO composite delivered a maximum power density of 6240.5 mW m(-2), 14.2 times higher than that of PPy/p-toluenesulfonate (pTS) as …

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Study On Vanadium Substitution To Iron In Li2fep 2o7 As Cathode Material For Lithium-Ion Batteries, Jiantie Xu, Shulei Chou, Qinfen Gu, M F. Md Din, Hua-Kun Liu, S X. Dou Jan 2014

Study On Vanadium Substitution To Iron In Li2fep 2o7 As Cathode Material For Lithium-Ion Batteries, Jiantie Xu, Shulei Chou, Qinfen Gu, M F. Md Din, Hua-Kun Liu, S X. Dou

Australian Institute for Innovative Materials - Papers

A series of Li2Fe1-3x/2VxP 2O7 (x = 0, 0.025, 0.05, 0.075, and 0.1) cathode materials for LIBs were prepared by the sol-gel method. Structural characterization of Li2Fe1-3x/2VxP2O7 (x = 0, 0.025, 0.05, 0.075, and 0.1) samples was conducted by synchrotron X-ray diffraction. The morphology and oxidation states of Fe2+ and V 3+ in the Li2Fe1-3x/2VxP 2O7 samples were confirmed by scanning electron microscopy and magnetic susceptibility measurements, respectively. The electrochemical measurements indicated that Li2Fe1-3x/2VxP 2O7 (x = 0.025) delivered the higher reversible capacity of 79.9 mAh g-1 at 1 C in the voltage range of 2.0 - 4.5 V with …

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In-Situ One-Step Hydrothermal Synthesis Of A Lead Germanate-Graphene Composite As A Novel Anode Material For Lithium-Ion Batteries, Jun Wang, Chuan-Qi Feng, Ziqi Sun, Shulei Chou, Hua-Kun Liu, Jia-Zhao Wang Jan 2014

In-Situ One-Step Hydrothermal Synthesis Of A Lead Germanate-Graphene Composite As A Novel Anode Material For Lithium-Ion Batteries, Jun Wang, Chuan-Qi Feng, Ziqi Sun, Shulei Chou, Hua-Kun Liu, Jia-Zhao Wang

Australian Institute for Innovative Materials - Papers

Lead germanate-graphene nanosheets (PbGeO3-GNS) composites have been prepared by an efficient one-step, in-situ hydrothermal method and were used as anode materials for Li-ion batteries (LIBs). The PbGeO3 nanowires, around 100-200 nm in diameter, are highly encapsulated in a graphene matrix. The lithiation and de-lithiation reaction mechanisms of the PbGeO3 anode during the charge-discharge processes have been investigated by X-ray diffraction and electrochemical characterization. Compared with pure PbGeO3 anode, dramatic improvements in the electrochemical performance of the composite anodes have been obtained. In the voltage window of 0.01-1.50 V, the composite anode with 20 wt.% GNS delivers a discharge capacity of …

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Pb Thin Films On Si(111): Local Density Of States And Defects, Stefan Eilers, Yi Du, S X. Dou Jan 2014

Pb Thin Films On Si(111): Local Density Of States And Defects, Stefan Eilers, Yi Du, S X. Dou

Australian Institute for Innovative Materials - Papers

Local density of states and atomic structure of the stripped incommensurate phase, the √3 x√7 phase and the 1 x 1 phase of a monolayer of Pb on Si(111) are characterized by scanning tunneling microscopy and spectroscopy. The dI/dV-images reveal congruent local density of states structures for the stripped incommensurate and the √3 x√ phase but suggest a hexagonal lattice of the local density of states for the 1x1 phase while the atomic structure consists of one more atom in the center of each hexagon. Vacancy defects and impurities show a depletion of local density of states for the stripped …

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Biocompatible Ionic Liquid-Biopolymer Electrolyte Enabled Thin And Compact Magnesium Air Batteries, Xiaoteng Jia, Yang Yang, Caiyun Wang, Chen Zhao, R Vijayaraghavan, Douglas R. Macfarlane, Maria Forsyth, Gordon G. Wallace Jan 2014

Biocompatible Ionic Liquid-Biopolymer Electrolyte Enabled Thin And Compact Magnesium Air Batteries, Xiaoteng Jia, Yang Yang, Caiyun Wang, Chen Zhao, R Vijayaraghavan, Douglas R. Macfarlane, Maria Forsyth, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

With the surge of interest in miniaturized implanted medical devices (IMDs), implantable power sources with small dimensions and biocompatibility are in high demand. Implanted battery/supercapacitor devices are commonly packaged within a case that occupies a large volume, making miniaturization difficult. In this study, we demonstrate a polymer electrolyte-enabled biocompatible magnesium-air battery device with a total thickness of approximately 300 μm. It consists of a biocompatible polypyrrole-para(toluene sulfonic acid) cathode and a bioresorbable magnesium alloy anode. The biocompatible electrolyte used is made of choline nitrate (ionic liquid) embedded in a biopolymer, chitosan. This polymer electrolyte is mechanically robust and offers a …

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Enhancing The High Rate Capability And Cycling Stability Of Limn2o4 By Coating Of Solid-State Electrolyte Linbo3, Zhijia Zhang, Shulei Chou, Qinfen Gu, Hua-Kun Liu, Huijun Li, Kiyoshi Ozawa, Jiazhao Wang Jan 2014

Enhancing The High Rate Capability And Cycling Stability Of Limn2o4 By Coating Of Solid-State Electrolyte Linbo3, Zhijia Zhang, Shulei Chou, Qinfen Gu, Hua-Kun Liu, Huijun Li, Kiyoshi Ozawa, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

To study the influence of solid state electrolyte coating layers on the performance of cathode materials for lithium-ion batteries in combination with organic liquid electrolyte, LiNbO3 coated Li1.08Mn1.92O4 cathode materials were synthesized by using a facile solid-state reaction method. The 0.06LiNbO3-0.97Li1.08Mn1.92O4 cathode exhibited an initial discharge capacity of 125 mAh g-1, retaining a capacity of 119 mAh g-1, at 25 oC, while at 55 oC, it exhibited an initial discharge capacity of 130 mAh g-1, retaining a capacity of 111 mAh g-1, both at a current density of 0.5 C (where 1 C is 148 mAh g-1). Very good rate …

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A Dye-Sensitized Visible Light Photocatalyst-Bi24o31cl10, Liang Wang, Jun Shang, Weichang Hao, Shiqi Jiang, Shiheng Huang, Tianmin Wang, Ziqi Sun, Yi Du, S X. Dou, Tengfeng Xie, Dejun Wang, Jiaou Wang Jan 2014

A Dye-Sensitized Visible Light Photocatalyst-Bi24o31cl10, Liang Wang, Jun Shang, Weichang Hao, Shiqi Jiang, Shiheng Huang, Tianmin Wang, Ziqi Sun, Yi Du, S X. Dou, Tengfeng Xie, Dejun Wang, Jiaou Wang

Australian Institute for Innovative Materials - Papers

The p-block semiconductors are regarded as a new family of visible-light photocatalysts because of their dispersive and anisotropic band structures as well as high chemical stability. The bismuth oxide halides belong to this family and have band structures and dispersion relations that can be engineered by modulating the stoichiometry of the halogen elements. Herein, we have developed a new visible-light photocatalyst Bi24O31Cl10 by band engineering, which shows high dye-sensitized photocatalytic activity. Density functional theory calculations reveal that the p-block elements determine the nature of the dispersive electronic structures and narrow band gap in Bi24O31Cl10. Bi24O31Cl10 exhibits excellent visible-light photocatalytic activity …

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Effects Of Oxygen Adsorption On The Surface State Of Epitaxial Silicene On Ag(111), Xun Xu, Jincheng Zhuang, Yi Du, Haifeng Feng, N Zhang, Chen Liu, Tao Lei, Jiaou Wang, M Spencer, Tetsuya Morishita, Xiaolin Wang, S X. Dou Jan 2014

Effects Of Oxygen Adsorption On The Surface State Of Epitaxial Silicene On Ag(111), Xun Xu, Jincheng Zhuang, Yi Du, Haifeng Feng, N Zhang, Chen Liu, Tao Lei, Jiaou Wang, M Spencer, Tetsuya Morishita, Xiaolin Wang, S X. Dou

Australian Institute for Innovative Materials - Papers

Epitaxial silicene, which is one single layer of silicon atoms packed in a honeycomb structure, demonstrates a strong interaction with the substrate that dramatically affects its electronic structure. The role of electronic coupling in the chemical reactivity between the silicene and the substrate is still unclear so far, which is of great importance for functionalization of silicene layers. Here, we report the reconstructions and hybridized electronic structures of epitaxial 4 3 4 silicene on Ag(111), which are revealed by scanning tunneling microscopy and angle-resolved photoemission spectroscopy. The hybridization between Si and Ag results in a metallic surface state, which can …

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The Formation Of Nano-Layered Grains And Their Enhanced Superconducting Transition Temperature In Mg-Doped Fese0.9 Bulks, Feng Lan, Zongqing Ma, Yongchang Liu, Ning Chen, Qi Cai, Huijun Li, Shaon Barua, Dipakkumar Patel, Md Shahriar Hossain, Jung Ho Kim, S X. Dou Jan 2014

The Formation Of Nano-Layered Grains And Their Enhanced Superconducting Transition Temperature In Mg-Doped Fese0.9 Bulks, Feng Lan, Zongqing Ma, Yongchang Liu, Ning Chen, Qi Cai, Huijun Li, Shaon Barua, Dipakkumar Patel, Md Shahriar Hossain, Jung Ho Kim, S X. Dou

Australian Institute for Innovative Materials - Papers

To search a proper dopant to further improve superconductivity in 11 type Fe-based superconductors makes sense to both their superconductivity mechanism and possible technological applications. In present work, Mg doped FeSe polycrystalline bulks were obtained by a two-step solid-state reaction method. Even though there are many MgSe and iron impurities existing in the Mg heavy doped FeSe bulks, they exhibit obviously increased Tc compared to undoped FeSe sample. It was found that Mg addition has little effect on the crystal lattice parameters of superconducting beta-FeSe, whereas leads to the formation of nano-layered grain structure consisted of MgSe and beta-FeSe …

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A Triblock-Copolymer-Templating Route To Carbon Spheres@Sba-15 Large Mesopore Core-Shell And Hollow Structures, Jianping Yang, Xianghong Qian, Minjun Chen, Jianwei Fan, Hua-Kun Liu, Weixian Zhang Jan 2014

A Triblock-Copolymer-Templating Route To Carbon Spheres@Sba-15 Large Mesopore Core-Shell And Hollow Structures, Jianping Yang, Xianghong Qian, Minjun Chen, Jianwei Fan, Hua-Kun Liu, Weixian Zhang

Australian Institute for Innovative Materials - Papers

The fabrication of mesoporous core-shell and hollow spheres with ordered mesostructures and tunable large pore sizes is highly desirable for fundamental research and practical applications. A direct triblock-copolymer-templating coating approach has been provided for the synthesis of carbon sphere@mesoporous silica core-shell (CS@SBA-15) and hollow structures in an acidic medium at room temperature. These CS@SBA-15 core-shell structures possess large mesopores (6.3-8.4 nm), high surface areas (318.1-438.4 m2 g-1) and large pore volumes (0.31-0.36 cm3 g-1). The corresponding hollow mesoporous silica spheres (HMSS) with controllable mesopores (6.0-8.2 nm), high surface areas (239.9-326.5 m2 g-1 …

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Electrically Contractile Polymers Augment Right Ventricular Output In The Heart, Arjang Ruhparwar, Patricia Piontek, Matthias Ungerer, Ali Ghodsizad, Sasan Partovi, Javad Foroughi, Gabor Szabo, Mina Farag, Matthias Karck, Geoffrey M. Spinks, Seon Jeong Kim Jan 2014

Electrically Contractile Polymers Augment Right Ventricular Output In The Heart, Arjang Ruhparwar, Patricia Piontek, Matthias Ungerer, Ali Ghodsizad, Sasan Partovi, Javad Foroughi, Gabor Szabo, Mina Farag, Matthias Karck, Geoffrey M. Spinks, Seon Jeong Kim

Australian Institute for Innovative Materials - Papers

Research into the development of artificial heart muscle has been limited to assembly of stem cell-derived cardiomyocytes seeded around a matrix, while nonbiological approaches to tissue engineering have rarely been explored. The aim of the study was to apply electrically contractile polymer-based actuators as cardiomyoplasty for positive inotropic support of the right ventricle. Complex trilayer polypyrrole (PPy) bending polymers for high-speed applications were generated. Bending motion occurred directly as a result of electrochemically driven charging and discharging of the PPy layers. In a rat model (n=5), strips of polymers (3x20mm) were attached and wrapped around the right ventricle …

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Novel Germanium/Polypyrrole Composite For High Power Lithium-Ion Batteries, Xuanwen Gao, Wenbin Luo, Chao Zhong, David Wexler, Shulei Chou, Hua-Kun Liu, Zhicong Shi, Guohua Chen, Kiyoshi Ozawa, Jiazhao Wang Jan 2014

Novel Germanium/Polypyrrole Composite For High Power Lithium-Ion Batteries, Xuanwen Gao, Wenbin Luo, Chao Zhong, David Wexler, Shulei Chou, Hua-Kun Liu, Zhicong Shi, Guohua Chen, Kiyoshi Ozawa, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

Nano-Germanium/polypyrrole composite has been synthesized by chemical reduction method in aqueous solution. The Ge nanoparticles were directly coated on the surface of the polypyrrole. The morphology and structural properties of samples were determined by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Thermogravimetric analysis was carried out to determine the polypyrrole content. The electrochemical properties of the samples have been investigated and their suitability as anode materials for the lithium-ion battery was examined. The discharge capacity of the Ge nanoparticles calculated in the Ge-polypyrrole composite is 1014 mAh g-1 after 50 cycles at 0.2 C rate, which is …

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Non-Wettable, Oxidation-Stable, Brightly Luminescent, Perfluorodecyl-Capped Silicon Nanocrystal Film, Chenxi Qian, Wei Sun, Liwei Wang, Chanlong Chen, Kristine Liao, Wendong Wang, Jia Jia, Benjamin D. Hatton, Gilberto Casillas, Marty Kurylowicz, Christopher M. Yip, Melanie L. Mastronardi, Geoffrey A. Ozin Jan 2014

Non-Wettable, Oxidation-Stable, Brightly Luminescent, Perfluorodecyl-Capped Silicon Nanocrystal Film, Chenxi Qian, Wei Sun, Liwei Wang, Chanlong Chen, Kristine Liao, Wendong Wang, Jia Jia, Benjamin D. Hatton, Gilberto Casillas, Marty Kurylowicz, Christopher M. Yip, Melanie L. Mastronardi, Geoffrey A. Ozin

Australian Institute for Innovative Materials - Papers

Here we describe for the first time the synthesis of colloidally stable, brightly luminescent perfluorodecyl-capped silicon nanocrystals and compare the properties of solutions and films made from them with those of their perhydrodecyl-capped relatives. The perfluorodecyl capping group compared to the perhydrodecyl capping group yields superior hydrophobicity and much greater resistance to air oxidation, the enhanced electron-withdrawing character induces blue shifts in the wavelength of photoluminescence, and the lower-frequency carbon-fluorine stretching modes disfavor non-radiative relaxation pathways and boost the absolute photoluminescence quantum yield. Together these attributes bode well for advanced materials and biomedical applications founded upon perfluorodecyl-protected silicon nanocrystals.

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Na3v2(Po4)3 Particles Partly Embedded In Carbon Nanofibers With Superb Kinetics For Ultra-High Power Sodium Ion Batteries, Junghoon Yang, Dongwook Han, Mi Ru Jo, Kyeongse Song, Yongil Kim, Shulei Chou, Hua-Kun Liu, Yong-Mook Kang Jan 2014

Na3v2(Po4)3 Particles Partly Embedded In Carbon Nanofibers With Superb Kinetics For Ultra-High Power Sodium Ion Batteries, Junghoon Yang, Dongwook Han, Mi Ru Jo, Kyeongse Song, Yongil Kim, Shulei Chou, Hua-Kun Liu, Yong-Mook Kang

Australian Institute for Innovative Materials - Papers

We here describe the extraordinary performance of NASICON Na3V2(PO4)3-carbon nanofiber (NVP-CNF) composites with ultra-high power and excellent cycling performance. NVP-CNFs are composed of CNFs at the center part and partly embedded NVP nanoparticles in the shell. We first report this unique morphology of NVP-CNFs for the electrode material of secondary batteries as well as for general energy conversion materials. Our NVP-CNFs show not only a high discharge capacity of approx. 88.9 mA h g-1 even at a high current density of 50 C but also approx. 93% cyclic retention property after …

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Single Crystalline Co3o4 Nanocrystals Exposed With Different Crystal Planes For Li-O2 Batteries, Dawei Su, S X. Dou, Guoxiu Wang Jan 2014

Single Crystalline Co3o4 Nanocrystals Exposed With Different Crystal Planes For Li-O2 Batteries, Dawei Su, S X. Dou, Guoxiu Wang

Australian Institute for Innovative Materials - Papers

Single crystalline Co3O4 nanocrystals exposed with different crystal planes were synthesised, including cubic Co3O4 nanocrystals enclosed by {100} crystal planes, pseudo octahedral Co3O4 enclosed by {100} and {110} crystal planes, Co3O4 nanosheets exposed by {110} crystal planes, hexagonal Co3O4 nanoplatelets exposed with {111} crystal planes, and Co3O4 nanolaminar exposed with {112} crystal planes. Well single crystalline features of these Co3O4 nanocrystals were confirmed by FESEM and HRTEM analyses. The electrochemical performance for Li-O2 batteries shows that Co3 …

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Three-Dimensional Printing Fiber Reinforced Hydrogel Composites, Shannon Bakarich, Robert Gorkin Iii, Marc In Het Panhuis, Geoffrey M. Spinks Jan 2014

Three-Dimensional Printing Fiber Reinforced Hydrogel Composites, Shannon Bakarich, Robert Gorkin Iii, Marc In Het Panhuis, Geoffrey M. Spinks

Australian Institute for Innovative Materials - Papers

An additive manufacturing process that combines digital modeling and 3D printing was used to prepare fiber reinforced hydrogels in a single-step process. The composite materials were fabricated by selectively pattering a combination of alginate/acrylamide gel precursor solution and an epoxy based UV-curable adhesive (Emax 904 Gel-SC) with an extrusion printer. UV irradiation was used to cure the two inks into a single composite material. Spatial control of fiber distribution within the digital models allowed for the fabrication of a series of materials with a spectrum of swelling behavior and mechanical properties with physical characteristics ranging from soft and wet to …

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Integrating A Triplet-Triplet Annihilation Up-Conversion System To Enhance Dye-Sensitized Solar Cell Response To Sub-Bandgap Light, Andrew Nattestad, Yuen Yap Cheng, R Macqueen, Gordon G. Wallace, Timothy Schmidt Jan 2014

Integrating A Triplet-Triplet Annihilation Up-Conversion System To Enhance Dye-Sensitized Solar Cell Response To Sub-Bandgap Light, Andrew Nattestad, Yuen Yap Cheng, R Macqueen, Gordon G. Wallace, Timothy Schmidt

Australian Institute for Innovative Materials - Papers

The poor response of dye-sensitized solar cells (DSCs) to red and infrared light is a significant impediment to the realization of higher photocurrents and hence higher efficiencies. Photon up-conversion by way of triplet-triplet annihilation (TTA-UC) is an attractive technique for using these otherwise wasted low energy photons to produce photocurrent, while not interfering with the photoanodic performance in a deleterious manner. Further to this, TTA-UC has a number of features, distinct from other reported photon up-conversion technologies, which renders it particularly suitable for coupling with DSC technology. In this work, a proven high performance TTA-UC system, comprising a palladium porphyrin …

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