Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

University of Wollongong

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 781 - 810 of 4868

Full-Text Articles in Physical Sciences and Mathematics

Correlation Among Physical And Electrochemical Behaviour Of Nanostructured Electrolytic Manganese Dioxide From Leach Liquor And Synthetic For Aqueous Asymmetric Capacitor, Manickam Minakshi, Avijit Biswal, David R. G Mitchell, Rob Jones, Carlos Fernandez Jan 2016

Correlation Among Physical And Electrochemical Behaviour Of Nanostructured Electrolytic Manganese Dioxide From Leach Liquor And Synthetic For Aqueous Asymmetric Capacitor, Manickam Minakshi, Avijit Biswal, David R. G Mitchell, Rob Jones, Carlos Fernandez

Australian Institute for Innovative Materials - Papers

An attempt has been made to correlate the differences in structural parameters, surface areas, morphology etc. with the electrochemical capacitive behaviour of the EMDs. The nanostructured electrolytic manganese dioxides (EMD) have been synthesized through electrodepositing MnO2 from two different leach liquors and a synthetic analogue thereof. The structural and chemical state was determined using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) respectively. Multiplet structure determination led to estimates of the manganese valence states present in the EMD. The EMDs have been tested in an asymmetric capacitor which we have developed. This used activated carbon as the negative electrode and …

Go to article

Improved Cycling Stability Of Lithium-Sulphur Batteries By Enhancing The Retention Of Active Material With A Sandwiched Hydrothermally Treated Graphite Film, Yuede Pan, Shulei Chou, Hua-Kun Liu, S X. Dou Jan 2016

Improved Cycling Stability Of Lithium-Sulphur Batteries By Enhancing The Retention Of Active Material With A Sandwiched Hydrothermally Treated Graphite Film, Yuede Pan, Shulei Chou, Hua-Kun Liu, S X. Dou

Australian Institute for Innovative Materials - Papers

A new lithium-sulphur battery with a hydrothermally treated graphite film sandwiched between the separator and the sulphur cathode shows increased capacity, enhanced cycling stability and improved coulombic efficiency. After 50 cycles, a high capacity of 631 mA h g-1 is maintained, compared to 203 mA h g-1 for the Li-S battery with conventional configuration. Moreover, the coulombic efficiency is increased to near 100% from around 94%. This improved electrochemical performance could be attributed to the new cell configuration, because the graphite film greatly retains the active material by alleviating the polysulphide shuttling problem and providing extra reaction sites for sulphur …

Go to article

Graphene-Wrapped Reversible Reaction For Advanced Hydrogen Storage, Guanglin Xia, Yingbin Tan, Feilong Wu, Fang Fang, Dalin Sun, Zaiping Guo, Zhenguo Huang, Xuebin Yu Jan 2016

Graphene-Wrapped Reversible Reaction For Advanced Hydrogen Storage, Guanglin Xia, Yingbin Tan, Feilong Wu, Fang Fang, Dalin Sun, Zaiping Guo, Zhenguo Huang, Xuebin Yu

Australian Institute for Innovative Materials - Papers

Here, we report the fabrication of a graphene-wrapped nanostructured reactive hydride composite, i.e., 2LiBH4-MgH2, made by adopting graphene-supported MgH2 nanoparticles (NPs) as the nanoreactor and heterogeneous nucleation sites. The porous structure, uniform distribution of MgH2 NPs, and the steric confinement by flexible graphene induced a homogeneous distribution of 2LiBH4-MgH2 nanocomposite on graphene with extremely high loading capacity (80 wt%) and energy density. The well-defined structural features, including even distribution, uniform particle size, excellent thermal stability, and robust architecture endow this composite with significant improvements in its hydrogen storage performance. For instance, at a temperature as low as 350 °C, a …

Go to article

Binder-Free And Carbon-Free 3d Porous Air Electrode For Li-O2 Batteries With High Efficiency, High Capacity, And Long Life, Wenbin Luo, Xuanwen Gao, Dongqi Shi, Shulei Chou, Jiazhao Wang, Hua-Kun Liu Jan 2016

Binder-Free And Carbon-Free 3d Porous Air Electrode For Li-O2 Batteries With High Efficiency, High Capacity, And Long Life, Wenbin Luo, Xuanwen Gao, Dongqi Shi, Shulei Chou, Jiazhao Wang, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

Pt-Gd alloy polycrystalline thin film is deposited on 3D nickel foam by pulsed laser deposition method serving as a whole binder/carbon-free air electrode, showing great catalytic activity enhancement as an efficient bifunctional catalyst for the oxygen reduction and evolution reactions in lithium oxygen batteries. The porous structure can facilitate rapid O2 and electrolyte diffusion, as well as forming a continuous conductive network throughout the whole energy conversion process. It shows a favorable cycle performance in the full discharge/charge model, owing to the high catalytic activity of the Pt-Gd alloy composite and 3D porous nickel foam structure. Specially, excellent cycling performance …

Go to article

Light Activated Electrochemistry: Light Intensity And Ph Dependence On Electrochemical Performance Of Anthraquinone Derivatized Silicon, Ying Yang, Simone Ciampi, Moinul H. Choudhury, J Justin Gooding Jan 2016

Light Activated Electrochemistry: Light Intensity And Ph Dependence On Electrochemical Performance Of Anthraquinone Derivatized Silicon, Ying Yang, Simone Ciampi, Moinul H. Choudhury, J Justin Gooding

Australian Institute for Innovative Materials - Papers

We seek to understand how the thermodynamics and kinetics of anthraquinone-containing self-assembled monolayer on silicon electrodes are affected by two key experimental variables: the intensity of the light assisting the anthraquinone/anthrahydroquinone redox process and the local solution environment. The substrates are chemically passivated poorly doped p-type silicon electrodes. The study presents a strategy for the selective modulation of either the anodic or the cathodic process occurring at the interface. Cyclic voltammetry studies showed that unlike for a proton-coupled electron transfer process performed at metallic electrodes, for the redox reaction of the anthraquinone unit on a silicon electrode it becomes possible …

Go to article

Enhancement Of Dye Regeneration Kinetics In Dichromophoric Porphyrin-Carbazole Triphenylamine Dyes Influenced By More Exposed Radical Cation Orbitals, Long Zhao, Pawel W. Wagner, Jonathan E. Barnsley, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila J. Mozer Jan 2016

Enhancement Of Dye Regeneration Kinetics In Dichromophoric Porphyrin-Carbazole Triphenylamine Dyes Influenced By More Exposed Radical Cation Orbitals, Long Zhao, Pawel W. Wagner, Jonathan E. Barnsley, Tracey M. Clarke, Keith C. Gordon, Shogo Mori, Attila J. Mozer

Australian Institute for Innovative Materials - Papers

Reduction kinetics of oxidized dyes absorbed on semiconductor surfaces and immersed in redox active electrolytes has been mainly modeled based on the free energy difference between the oxidation potential of the dye and the redox potential of the electrolyte. Only a few mechanisms have been demonstrated to enhance the kinetics by other means. In this work, the rate constant of the reduction of oxidized porphyrin dye is enhanced by attaching non-conjugated carbazole triphenylamine moiety using iodine/triiodide and tris(2,2′-bispyridinium)cobalt II/III electrolytes. These results are obtained using transient absorption spectroscopy by selectively probing the regeneration kinetics at the porphyrin radical cation and …

Go to article

Aqueous Electrosynthesis Of An Electrochromic Material Based Water-Soluble Edot-Menh2 Hydrochloride, Hui Sun, Long Zhang, Liqi Dong, Xiaofei Zhu, Shouli Ming, Youshan Zhang, Huakun Xing, Xuemin Duan, Jingkun Xu Jan 2016

Aqueous Electrosynthesis Of An Electrochromic Material Based Water-Soluble Edot-Menh2 Hydrochloride, Hui Sun, Long Zhang, Liqi Dong, Xiaofei Zhu, Shouli Ming, Youshan Zhang, Huakun Xing, Xuemin Duan, Jingkun Xu

Australian Institute for Innovative Materials - Papers

2'-Aminomethyl-3,4-ethylenedioxythiophene (EDOT-MeNH2) showed unsatisfactory results when its polymerization occurred in organic solvent in our previous report. Therefore, a water-soluble EDOT derivative was designed by using hydrochloric modified EDOT-MeNH2 (EDOT-MeNH2·HCl) and electropolymerized in aqueous solution to form the corresponding polymer with excellent electrochromic properties. Moreover, the polymer was systematically explored, including electrochemical, optical properties and structure characterization. Cyclic voltammetry showed low oxidation potential of EDOT-MeNH2·HCl (0.85 V) in aqueous solution, leading to the facile electrodeposition of uniform the polymer film with outstanding electroactivity. Compared with poly(2′-aminomethyl- 3,4-ethylenedioxythiophene) (PEDOT-MeNH2), poly(2′-aminomethyl-3,4-ethylenedioxythiophene salt) (PEDOT-MeNH3 +A-) revealed higher efficiencies (156 cm2 C-1), lower bandgap (1.68 …

Go to article

All-In-One Energy Harvesting And Storage Devices, Ju-Hyuck Lee, Jeonghun Kim, Tae Yun Kim, Md Shahriar Hossain, Sang Woo Kim, Jung Ho Kim Jan 2016

All-In-One Energy Harvesting And Storage Devices, Ju-Hyuck Lee, Jeonghun Kim, Tae Yun Kim, Md Shahriar Hossain, Sang Woo Kim, Jung Ho Kim

Australian Institute for Innovative Materials - Papers

Currently, integration of energy harvesting and storage devices is considered to be one of the most important energy-related technologies due to the possibility of replacing batteries or at least extending the lifetime of a battery. This review aims to describe current progress in the various types of energy harvesters, hybrid energy harvesters, including multi-type energy harvesters with coupling of multiple energy sources, and hybridization of energy harvesters and energy storage devices for self-powered electronics. We summarize research on recent energy harvesters based on the piezoelectric, triboelectric, pyroelectric, thermoelectric, and photovoltaic effects. We also cover hybrid cell technologies to simultaneously generate …

Go to article

High-Performance Multifunctional Graphene-Plga Fibers: Toward Biomimetic And Conducting 3d Scaffolds, Dorna Esrafilzadeh, Rouhollah Jalili, Elise M. Stewart, Seyed Hamed Aboutalebi, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace Jan 2016

High-Performance Multifunctional Graphene-Plga Fibers: Toward Biomimetic And Conducting 3d Scaffolds, Dorna Esrafilzadeh, Rouhollah Jalili, Elise M. Stewart, Seyed Hamed Aboutalebi, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, it is demonstrated that with the aid of rheological insights, optimized formulations of graphene containing spinnable poly(lactic-co-glycolic acid) (PLGA) dopes can be made possible. This helps extend the general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solution-processed graphene into the design process and practical fiber architectural engineering. The as-produced fibers are found to exhibit excellent electrical conductivity and electrochemical performance, good mechanical properties, and cellular …

Go to article

Magnetic Field Actuated Manipulation And Transfer Of Oil Droplets On A Stable Underwater Superoleophobic Surface, Haifeng Feng, Xun Xu, Weichang Hao, Yi Du, Dongliang Tian, Lei Jiang Jan 2016

Magnetic Field Actuated Manipulation And Transfer Of Oil Droplets On A Stable Underwater Superoleophobic Surface, Haifeng Feng, Xun Xu, Weichang Hao, Yi Du, Dongliang Tian, Lei Jiang

Australian Institute for Innovative Materials - Papers

The transport of fluids at functional interfaces, driven by the external stimuli, is well established. The lossless transport of oil-based fluids under water remains a challenge, however, due to their high stickiness towards the surface. Here, a superhydrophilic and underwater superoleophobic tri-phase water/oil/solid nanoarray surface has been designed and prepared. The unique tri-phase surface exhibits underwater superoleophobic properties with an extremely low stickiness towards oil-based fluids. The magnetic-field-driven manipulation and transport of oil-based magnetic fluids are demonstrated under water, which opens up a new pathway to design flexible and smart devices for the control and transfer of liquid droplets by …

Go to article

Moo2/Mo2c/C Spheres As Anode Materials For Lithium Ion Batteries, Mohammad Ihsan, Hongqiang Wang, Siti R. Majid, Jianping Yang, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu Jan 2016

Moo2/Mo2c/C Spheres As Anode Materials For Lithium Ion Batteries, Mohammad Ihsan, Hongqiang Wang, Siti R. Majid, Jianping Yang, Shane J. Kennedy, Zaiping Guo, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

MoO2/Mo2C/C spheres have been synthesized through hydrothermal and calcination processes. MoO2 is well known for its high theoretical capacity of 838 mAh g-1, but undergoes capacity fading during Li+ insertion/extraction processes. Mo2C has high specific conductance (1.02 x 102 S cm-1) that can provide better electronic conductivity. Carbon is popular for its ability to accommodate the volume variation during charge/discharge. By taking advantage of the combination of Mo2C and C, these MoO2/Mo2C/C spheres demonstrate not only high cycling performance, but also good rate capability when they are used as anode materials for lithium ion batteries. After 100 cycles at 100 …

Go to article

Point Defects In Epitaxial Silicene On Ag(111) Surfaces, Hongsheng Liu, Haifeng Feng, Yi Du, Jian Chen, Ke-Hui Wu, Jijun Zhao Jan 2016

Point Defects In Epitaxial Silicene On Ag(111) Surfaces, Hongsheng Liu, Haifeng Feng, Yi Du, Jian Chen, Ke-Hui Wu, Jijun Zhao

Australian Institute for Innovative Materials - Papers

Silicene, a counterpart of graphene, has achieved rapid development due to its exotic electronic properties and excellent compatibility with the mature silicon-based semiconductor technology. Its low room-temperature mobility of ~100 cm2 V−1 s−1, however, inhibits device applications such as in field-effect transistors. Generally, defects and grain boundaries would act as scattering centers and thus reduce the carrier mobility. In this paper, the morphologies of various point defects in epitaxial silicene on Ag(111) surfaces have been systematically investigated using first-principles calculations combined with experimental scanning tunneling microscope (STM) observations. The STM signatures for various defects in epitaxial silicene on Ag(111) surface …

Go to article

A Ferroelectric Photocatalyst Ag10si4o13 With Visible-Light Photooxidation Properties, Amar Al-Keisy, Long Ren, Dandan Cui, Zhongfei Xu, Xun Xu, Xiangdong Su, Weichang Hao, S X. Dou, Yi Du Jan 2016

A Ferroelectric Photocatalyst Ag10si4o13 With Visible-Light Photooxidation Properties, Amar Al-Keisy, Long Ren, Dandan Cui, Zhongfei Xu, Xun Xu, Xiangdong Su, Weichang Hao, S X. Dou, Yi Du

Australian Institute for Innovative Materials - Papers

Ferroelectric p-block semiconductors are regarded as a new family of visible-light photocatalysts because of their dispersive and anisotropic band structures, as well as their intrinsic internal electric field. Silver silicates belong to this family and have band structures and an internal electric field that can be engineered by modulating the stoichiometry of Ag and SiO4. Here, we have developed a new ferroelectric p-block photocatalyst, Ag10Si4O13, by materials design and band engineering, which exhibits excellent photocatalytic activity towards the degradation of organic compounds, which is driven by visible light. Owing to the unique d10 and sp/p configurations in its electronic structure, …

Go to article

The Effect Of Treatment Time On The Ionic Liquid Surface Film Formation: Promising Surface Coating For Mg Alloy Az31, Yafei Zhang, Xiao Liu, Sina S. Jamali, Bruce Prof Bruce Hinton, Simon E. Moulton, Gordon G. Wallace, Maria Forsyth Jan 2016

The Effect Of Treatment Time On The Ionic Liquid Surface Film Formation: Promising Surface Coating For Mg Alloy Az31, Yafei Zhang, Xiao Liu, Sina S. Jamali, Bruce Prof Bruce Hinton, Simon E. Moulton, Gordon G. Wallace, Maria Forsyth

Australian Institute for Innovative Materials - Papers

Mg alloys are attractive materials for medical devices. The main limitation is that they are prone to corrosion. A low toxicity surface coating that enables uniform, controlled corrosion at a desired rate (this usually means it must offer barrier functions for a limited time period) is desirable. Phosphate-based ionic liquids (ILs) are known to induce a coating that can reduce the corrosion rate of Mg alloys, Furthermore, some ILs are known to be biocompatible and therefore, controlling the corrosion behaviour of an Mg alloy and its surface biocompatibility can be achieved through adding an appropriate low toxic IL surface layer …

Go to article

Heteroaromatic Organic Compound With Conjugated Multi-Carbonyl As Cathode Material For Rechargeable Lithium Batteries, Meixiang Lv, Fen Zhang, Yiwen Wu, Mujuan Chen, Chunfeng Yao, Junmin Nan, D Shu, Ronghua Zeng, Heping Zeng, Shulei Chou Jan 2016

Heteroaromatic Organic Compound With Conjugated Multi-Carbonyl As Cathode Material For Rechargeable Lithium Batteries, Meixiang Lv, Fen Zhang, Yiwen Wu, Mujuan Chen, Chunfeng Yao, Junmin Nan, D Shu, Ronghua Zeng, Heping Zeng, Shulei Chou

Australian Institute for Innovative Materials - Papers

The heteroaromatic organic compound, N,N'-diphenyl-1,4,5,8-naphthalenetetra-carboxylic diimide (DP-NTCDI-250) as the cathode material of lithium batteries is prepared through a simple one-pot N-acylation reaction of 1,4,5,8-naphthalenetetra-carboxylic dianhydride (NTCDA) with phenylamine (PA) in DMF solution followed by heat treatment in 250 °C. The as prepared sample is characterized by the combination of elemental analysis, NMR, FT-IR, TGA, XRD, SEM and TEM. The electrochemical measurements show that DP-NTCDI-250 can deliver an initial discharge capacity of 170 mAh g-1 at the current density of 25 mA g-1. The capacity of 119 mAh g-1 can be retained after 100 cycles. Even at the high current density …

Go to article

The Smallest Quaternary Ammonium Salts With Ether Groups For High-Performance Electrochemical Double Layer Capacitors, Taihee Han, Min-Sik Park, Jeonghun Kim, Jung Ho Kim, Ketack Kim Jan 2016

The Smallest Quaternary Ammonium Salts With Ether Groups For High-Performance Electrochemical Double Layer Capacitors, Taihee Han, Min-Sik Park, Jeonghun Kim, Jung Ho Kim, Ketack Kim

Australian Institute for Innovative Materials - Papers

Electrochemical double layer capacitors (EDLCs) are energy storage devices that have been used for a wide range of electronic applications. In particular, the electrolyte is one of the important components, directly related to the capacitance and stability. Herein, we first report a series of the smallest quaternary ammonium salts (QASs), with ether groups on tails and tetrafluoroborate (BF4) as an anion, for use in EDLCs. To find the optimal structure, various QASs with different sized head groups and ether-containing tail groups were systematically compared. Comparing two nearly identical structures with and without ether groups, QASs with oxygen atoms showed improved …

Go to article

One-Step Synthesis Of A Silicon/Hematite@Carbon Hybrid Nanosheet/Silicon Sandwich-Like Composite As An Anode Material For Li-Ion Batteries, Lei Zhang, Haipeng Guo, Ranjusha Rajagopalan, Xianluo Hu, Yunhui Huang, S X. Dou, Hua-Kun Liu Jan 2016

One-Step Synthesis Of A Silicon/Hematite@Carbon Hybrid Nanosheet/Silicon Sandwich-Like Composite As An Anode Material For Li-Ion Batteries, Lei Zhang, Haipeng Guo, Ranjusha Rajagopalan, Xianluo Hu, Yunhui Huang, S X. Dou, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

Silicon and hematite, both important functional materials with high theoretical capacity, have been intensively investigated separately for application as anode materials in lithium ion batteries (LIBs). The main challenges associated with these anode materials are their low electronic conductivity and structural degradation caused by large volume expansion during cycling, which are not tolerable for future LIBs with high energy density and large power output. Active particles anchored on a porous conductive skeleton are widely used for improving the electrochemical performance of silicon as well as that of hematite. Herein, we develop a novel-structured carbon-silicon-hematite anode material via a single-step technique …

Go to article

Tuned In Situ Growth Of Nanolayered Rgo On 3d Na3v2(Po4)3 Matrices: A Step Toward Long Lasting, High Power Na-Ion Batteries, Ranjusha Rajagopalan, Lei Zhang, S X. Dou, Hua-Kun Liu Jan 2016

Tuned In Situ Growth Of Nanolayered Rgo On 3d Na3v2(Po4)3 Matrices: A Step Toward Long Lasting, High Power Na-Ion Batteries, Ranjusha Rajagopalan, Lei Zhang, S X. Dou, Hua-Kun Liu

Australian Institute for Innovative Materials - Papers

Even though significant improvements have been made in sodium ion batteries, battery management mandates that all batteries in a pack are kept at an acceptable level of more than 80% capacity retention after a long cycle when it is tested for emergencies. Based on these realistic facts, the present study profitably exploits in situ grown reduced graphene oxide on 3D Na3V2 (PO4)3 matrices exhibiting a high rate performance and a specific discharge capacity of 117 mAh g-1. Unlike the earlier literature reports, it is demonstrated that the fabricated electrode shows >85% capacity retention after 6000 cycles at 10 C, the …

Go to article

Crystallographic Origin Of Cycle Decay Of The High-Voltage Lini0.5Mn1.5O4 Spinel Lithium-Ion Battery Electrode, Wei Kong Pang, Cheng-Zhang Lu, Chia-Erh Liu, Vanessa K. Peterson, Hsiu-Fen Lin, Shih-Chieh Liao, Jinming Chen Jan 2016

Crystallographic Origin Of Cycle Decay Of The High-Voltage Lini0.5Mn1.5O4 Spinel Lithium-Ion Battery Electrode, Wei Kong Pang, Cheng-Zhang Lu, Chia-Erh Liu, Vanessa K. Peterson, Hsiu-Fen Lin, Shih-Chieh Liao, Jinming Chen

Australian Institute for Innovative Materials - Papers

High-voltage spinel LiNi0.5Mn1.5O4 (LNMO) is considered a potential high-power-density positive electrode for lithium-ion batteries, however, it suffers from capacity decay after extended charge-discharge cycling, severely hindering commercial application. Capacity fade is thought to occur through the significant volume change of the LNMO electrode occurring on cycling, and in this work we use operando neutron powder diffraction to compare the structural evolution of the LNMO electrode in an as-assembled 18650-type battery containing a Li4Ti5O12 negative electrode with that in an identical battery following 1000 cycles at high-current. We reveal that the capacity reduction in the battery post cycling is directly proportional …

Go to article

Effect Of Post-Spinning On The Electrical And Electrochemical Properties Of Wet Spun Graphene Fibre, Javad Foroughi, Dennis Antiohos, Gordon G. Wallace Jan 2016

Effect Of Post-Spinning On The Electrical And Electrochemical Properties Of Wet Spun Graphene Fibre, Javad Foroughi, Dennis Antiohos, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

There is an urgent need for electroactive materials that exhibit high electrochemical performance and mechanically-compliant properties while also retaining high strength and durability. Single graphene sheets have a large electroactive surface area and excellent electrical properties. However, to transfer the excellent mechanical and physical properties of individual graphene to macrostructures for practical application remains a challenge. Herein we demonstrate the effect of carbon nanotubes and/or conducting polymer on electrical and electrochemical properties of graphene fibres. The hybrid graphene/carbon nanotube/poly(3,4-ethylenedioxythiophene) fiber possessed significantly higher electrical conductivity (over 400 S cm-1) compared to a graphene fiber. This value is ≈500% higher than …

Go to article

Ph-Responsive Fe(Iii)-Gallic Acid Nanoparticles For In Vivo Photoacoustic Imaging-Guided Photothermal Therapy, Jianfeng Zeng, Ming Cheng, Yong Wang, Ling Wen, Ling Chen, Zhen Li, Yongyou Wu, Mingyuan Gao, Zhifang Chai Jan 2016

Ph-Responsive Fe(Iii)-Gallic Acid Nanoparticles For In Vivo Photoacoustic Imaging-Guided Photothermal Therapy, Jianfeng Zeng, Ming Cheng, Yong Wang, Ling Wen, Ling Chen, Zhen Li, Yongyou Wu, Mingyuan Gao, Zhifang Chai

Australian Institute for Innovative Materials - Papers

pH-responsive biocompatible Fe(III)-gallic acid nanoparticles with strong near-infrared absorbance are very stable in mild acidic conditions, but easily decomposed in neutral conditions, which enables the nanoparticles to be stable in a tumor and easily metabolized in other organs, thus providing a safe nanoplatform for in vivo photoacoustic imaging/photothermal therapy theranostic applications.

Go to article

Fabrication Of A Graphene Coated Nonwoven Textile For Industrial Applications, Dharshika Kongahage, Javad Foroughi, Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace Jan 2016

Fabrication Of A Graphene Coated Nonwoven Textile For Industrial Applications, Dharshika Kongahage, Javad Foroughi, Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

A cost effective electrically conductive textile for large scale applications would revolutionise numerous industries. Herein, we demonstrate a novel processing approach to produce conductive textiles for industrial applications. A conductive nonwoven textile was successfully fabricated using a simple dip coating method. The nonwoven polyester was coated with liquid crystallite graphene oxide with subsequent non-toxic chemical reduction. The process is readily scalable. The graphene coated fabric has been characterized by electron microscopy as well as by electrical, mechanical, thermal and abrasion resistance measurements. It was found that the electrical surface resistivity of the prepared polyester-graphene composite fabric was 330 Ω □-1. …

Go to article

Robust Ferromagnetism Of Single Crystalline Coxzn1−Xo (0.3 ≤ X ≤ 0.45) Epitaxial Films With High Co Concentration, Qiang Cao, Dapeng Zhu, Maxiang Fu, Li Cai, Ping Yang, Shuang Li, Yinlian Zhu, Xiuliang Ma, Guo-Lei Liu, Yan-Xue Chen, Shi-Shen Yan, Liang-Mo Mei, Xiaolin Wang Jan 2016

Robust Ferromagnetism Of Single Crystalline Coxzn1−Xo (0.3 ≤ X ≤ 0.45) Epitaxial Films With High Co Concentration, Qiang Cao, Dapeng Zhu, Maxiang Fu, Li Cai, Ping Yang, Shuang Li, Yinlian Zhu, Xiuliang Ma, Guo-Lei Liu, Yan-Xue Chen, Shi-Shen Yan, Liang-Mo Mei, Xiaolin Wang

Australian Institute for Innovative Materials - Papers

In contrast to conventional dilute magnetic semiconductors with concentrations of magnetic ions of just a few percent, here, we report the fabrication of epitaxial Cox Zn 1− xO single crystalline films with Co concentrations from x = 0.3 up to 0.45 by radio-frequency oxygen-plasma-assisted molecular beam epitaxy. The films retain their single crystalline wurtzite structure without any other crystallographic phase from precipitates, based on reflection high energy electron diffraction, X-ray diffraction, transmission electron microscopy, and Raman scattering. The results of X-ray diffraction, optical transmission spectroscopy, and in-situ X-ray photoelectron spectroscopy confirm the incorporation of Co2+ cations into the wurtzite lattice. …

Go to article

Mineral-Biochar Composites: Molecular Structure And Porosity, Aditya Rawal, Stephen D. Joseph, James M. Hook, Chee Chia, Paul R. Munroe, Scott Donne, Yun Lin, David Phelan, David R. G Mitchell, Ben Pace, Josip Horvat, J. Beau W. Webber Jan 2016

Mineral-Biochar Composites: Molecular Structure And Porosity, Aditya Rawal, Stephen D. Joseph, James M. Hook, Chee Chia, Paul R. Munroe, Scott Donne, Yun Lin, David Phelan, David R. G Mitchell, Ben Pace, Josip Horvat, J. Beau W. Webber

Australian Institute for Innovative Materials - Papers

Dramatic changes in molecular structure, degradation pathway, and porosity of biochar are observed at pyrolysis temperatures ranging from 250 to 550 °C when bamboo biomass is pretreated by iron-sulfate-clay slurries (iron-clay biochar), as compared to untreated bamboo biochar. Electron microscopy analysis of the biochar reveals the infusion of mineral species into the pores of the biochar and the formation of mineral nanostructures. Quantitative 13C nuclear magnetic resonance (NMR) spectroscopy shows that the presence of the iron clay prevents degradation of the cellulosic fraction at pyrolysis temperatures of 250 °C, whereas at higher temperatures (350-550 °C), the clay promotes biomass degradation, …

Go to article

General Synthesis Of Xli2mno3·(1 - X)Lini1/3co1/3mn1/3o2 (X = 1/4, 1/3, And 1/2) Hollow Microspheres Towards Enhancing The Performance Of Rechargeable Lithium Ion Batteries, Jingfa Li, Min Li, Lei Zhang, Jiazhao Wang Jan 2016

General Synthesis Of Xli2mno3·(1 - X)Lini1/3co1/3mn1/3o2 (X = 1/4, 1/3, And 1/2) Hollow Microspheres Towards Enhancing The Performance Of Rechargeable Lithium Ion Batteries, Jingfa Li, Min Li, Lei Zhang, Jiazhao Wang

Australian Institute for Innovative Materials - Papers

Well-crystallized and high-performance xLi2MnO3·(1 - x)LiNi1/3Co1/3Mn1/3O2 (x = 1/2, 1/3, 1/4) hollow microspheres are prepared through an in situ self-sacrificial template route. By precisely adjusting y values in the starting precursor, CoyMn3-yO4 porous microspheres, uniform xLi2MnO3·(1 - x)LiNi1/3Co1/3Mn1/3O2 hollow microspheres are formed. Property testing of lithium ion batteries shows that an appropriate x value plays an important role in their electrochemical behavior: a higher x value leads to a higher specific capacity, but a worse cycling capability, and vice versa; when x = 1/3, the xLi2MnO3·(1 - x)LiNi1/3Co1/3Mn1/3O2 electrode shows a high specific capacity and a high capacity retention rate. …

Go to article

Woven-Yarn Thermoelectric Textiles, Jae Ah Lee, Ali E. Aliev, Julia S. Bykova, Monica Jung De Andrade, Daeyoung Kim, Hyeon Jun Sim, Xavier Lepró, Anvar Zakhidov, Jeongbong Lee, Geoffrey M. Spinks, Siegmar Roth, Seon Jeong Kim, Ray H. Baughman Jan 2016

Woven-Yarn Thermoelectric Textiles, Jae Ah Lee, Ali E. Aliev, Julia S. Bykova, Monica Jung De Andrade, Daeyoung Kim, Hyeon Jun Sim, Xavier Lepró, Anvar Zakhidov, Jeongbong Lee, Geoffrey M. Spinks, Siegmar Roth, Seon Jeong Kim, Ray H. Baughman

Australian Institute for Innovative Materials - Papers

The fabrication and characterization of highly flexible textiles are reported. These textiles can harvest thermal energy from temperature gradients in the desirable through-thickness direction. The tiger yarns containing n- and p-type segments are woven to provide textiles containing n-p junctions. A high power output of up to 8.6 W m−2 is obtained for a temperature difference of 200 °C.

Go to article

Brazing Techniques For The Fabrication Of Biocompatible Carbon-Based Electronic Devices, Nicholas V. Apollo, Desmond Lau, Arman Ahnood, Alastair Stacey, Kumaravelu Ganesan, Samantha G. Lichter, Kate Fox, Javad Foroughi, Hamish Meffin, Gordon G. Wallace, Ray H. Baughman, Steven Prawer, David J. Garrett Jan 2016

Brazing Techniques For The Fabrication Of Biocompatible Carbon-Based Electronic Devices, Nicholas V. Apollo, Desmond Lau, Arman Ahnood, Alastair Stacey, Kumaravelu Ganesan, Samantha G. Lichter, Kate Fox, Javad Foroughi, Hamish Meffin, Gordon G. Wallace, Ray H. Baughman, Steven Prawer, David J. Garrett

Australian Institute for Innovative Materials - Papers

Prototype electronic devices have been critical to the discovery and demonstration of the unique properties of new materials, including composites based on carbon nanotubes (CNT) and graphene. However, these devices are not typically constructed with durability or biocompatibility in mind, relying on conductive polymeric adhesives, mechanical clamps or crimps, or solders for electrical connections. In this paper, two key metallization techniques are presented that employ commercially-available brazing alloys to fabricate electronic devices based on diamond and carbonaceous wires. Investigation of the carbon - alloy interfacial interactions was utilized to guide device fabrication. The interplay of both chemical ("adhesive") and mechanical …

Go to article

Boric Acid Assisted Reduction Of Graphene Oxide: A Promising Material For Sodium Ion Batteries, Ying Wang, Caiyun Wang, Yijing Wang, Hua-Kun Liu, Zhenguo Huang Jan 2016

Boric Acid Assisted Reduction Of Graphene Oxide: A Promising Material For Sodium Ion Batteries, Ying Wang, Caiyun Wang, Yijing Wang, Hua-Kun Liu, Zhenguo Huang

Australian Institute for Innovative Materials - Papers

Reduced graphene oxide, an intensively investigated material for Li-ion batteries, has shown mostly unsatisfactory performance in Na-ion batteries, since its d-spacing is believed to be too small for effective insertion/deinsertion of Na+ ions. Herein, a facile method was developed to produce boron-functionalized reduced graphene oxide (BF-rGO), with an enlarged interlayer spacing and defect-rich structure, which effectively accommodates the sodiation/desodiation and provides more active sites. The Na/BF-rGO half cells exhibit unprecedented long cycling stability, with ∼89.4% capacity retained after 5000 cycles (0.002% capacity decay per cycle) at 1000 mA·g-1 current density. High specific capacity (280 mAh·g-1) and great rate capability were …

Go to article

Strong Affinity Of Polysulfide Intermediates To Multi-Functional Binder For Practical Application In Lithium-Sulfur Batteries, Hongqiang Wang, Vitor Sencadas, Guoping Gao, Hong Gao, Aijun Du, Hua-Kun Liu, Zaiping Guo Jan 2016

Strong Affinity Of Polysulfide Intermediates To Multi-Functional Binder For Practical Application In Lithium-Sulfur Batteries, Hongqiang Wang, Vitor Sencadas, Guoping Gao, Hong Gao, Aijun Du, Hua-Kun Liu, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Binder, one of the most important battery components, plays a critical role in lithium-sulfur batteries. Poly(vinylidene difluoride) (PVDF), a commonly used binder in lithium-sulfur batteries, does not have a strong affinity to the intermediate polysulfides, however, leading to fast capacity fading with electrochemical cycling. Herein, copolymers of vinylidene difluoride with other monomers are used as multi-functional binders to enhance the electrochemical performance of lithium-sulfur batteries. Compared to the PVDF, the copolymer, poly(vinylidene difluoride-trifluoroethylene) (P(VDF-TRFE)) binder exhibits higher adhesion strength, less porosity, and stronger chemical interaction with polysulfides, which helps to keep the polysulfides within the cathode region, thereby improving the …

Go to article

A Free-Standing Graphene-Polypyrrole Hybrid Paper Via Electropolymerization With An Enhanced Areal Capacitance, Kewei Shu, Caiyun Wang, Chen Zhao, Yu Ge, Gordon G. Wallace Jan 2016

A Free-Standing Graphene-Polypyrrole Hybrid Paper Via Electropolymerization With An Enhanced Areal Capacitance, Kewei Shu, Caiyun Wang, Chen Zhao, Yu Ge, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Here we developed a free-standing reduced graphene oxide (rGO)-polypyrrole (PPy) hybrid paper via electropolymerization on a paper-like graphene gel. This flexible hybrid paper displayed a uniform layered structure with PPy coated onto the graphene layers. A high areal mass of 2.7 mg cm−2 could be obtained. It delivered a greatly enhanced areal capacitance of 440 mF cm−2 at 0.5 A g−1, in contrast to that 151∼198.5 mF cm−2 previously reported for graphene paper or polypyrrole-graphene paper. It can retain ∼81% of the initial capacitance at a high current density of 6 A g−1. The combined high flexibility with outstanding electrochemical …

Go to article

First Prev Next Last