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Articles 931 - 960 of 1524
Full-Text Articles in Physical Sciences and Mathematics
A Versatile Binder-Free Tio2 Paste For Dye-Sensitized Solar Cells, Jeremy H. Yune, Inna Karatchevtseva, P Evans, Klaudia K. Wagner, Matthew J. Griffith, David L. Officer, Gerry Triani
A Versatile Binder-Free Tio2 Paste For Dye-Sensitized Solar Cells, Jeremy H. Yune, Inna Karatchevtseva, P Evans, Klaudia K. Wagner, Matthew J. Griffith, David L. Officer, Gerry Triani
Australian Institute for Innovative Materials - Papers
In this study, binder-free TiO2 colloidal pastes have been prepared using a variety of heterocyclic bases with diverse characteristics to produce robust photoanodes for dye-sensitized solar cells (DSSC) from a single cast film thickness of 5 micron. The influence of the base on the electrode structure and film morphology, including its electron donor characteristics are investigated after low temperature thermal treatment and high temperature sintering. The results show that quinoline in the TiO2 paste is retained within the electrode structure in comparison to piperidine and pyridine after a short thermal treatment of 150 °C for 15 minutes. The …
Manganese Dioxide-Anchored Three-Dimensional Nitrogen-Doped Graphene Hybrid Aerogels As Excellent Anode Materials For Lithium Ion Batteries, Zhu Yin Sui, Caiyun Wang, Kewei Shu, Quan-Sheng Yang, Yu Ge, Gordon G. Wallace, Bao Hang Han
Manganese Dioxide-Anchored Three-Dimensional Nitrogen-Doped Graphene Hybrid Aerogels As Excellent Anode Materials For Lithium Ion Batteries, Zhu Yin Sui, Caiyun Wang, Kewei Shu, Quan-Sheng Yang, Yu Ge, Gordon G. Wallace, Bao Hang Han
Australian Institute for Innovative Materials - Papers
The capacity of manganese dioxide (MnO2) deteriorates with cycling due to the irreversible changes induced by the repeated lithiation and delithiation processes. To overcome this drawback, MnO2/nitrogen-doped graphene hybrid aerogels (MNGAs) were prepared via a facile redox process between KMnO4 and carbon within nitrogen-doped graphene hydrogels. The three-dimensional nitrogen-doped graphene hydrogels were prepared and utilized as matrices for MnO2 deposition. The MNGAs-120 obtained after a deposition time of 120 min delivered a very high discharge capacity of 909 mA h g-1 after 200 cycles at a current density of 400 mA g-1 …
Efficient, Absorption-Powered Artificial Muscles Based On Carbon Nanotube Hybrid Yarns, Marcio D. Lima, Mohammad W. Hussain, Geoffrey M. Spinks, Sina Naficy, Daniela Hagenasr, Julia S. Bykova, Derrick Tolly, Ray H. Baughman
Efficient, Absorption-Powered Artificial Muscles Based On Carbon Nanotube Hybrid Yarns, Marcio D. Lima, Mohammad W. Hussain, Geoffrey M. Spinks, Sina Naficy, Daniela Hagenasr, Julia S. Bykova, Derrick Tolly, Ray H. Baughman
Australian Institute for Innovative Materials - Papers
A new type of absorption-powered artificial muscle provides high performance without needing a temperature change. These muscles, comprising coiled carbon nanotube fibers infiltrated with silicone rubber, can contract up to 50% to generate up to 1.2 kJ kg−1. The drive mechanism for actuation is the rubber swelling during exposure to a nonpolar solvent. Theoretical energy efficiency conversion can be as high as 16%.
Reduced Graphene Oxide And Polypyrrole/Reduced Graphene Oxide Composite Coated Stretchable Fabric Electrodes For Supercapacitor Application, Chen Zhao, Kewei Shu, Caiyun Wang, Sanjeev Gambhir, Gordon G. Wallace
Reduced Graphene Oxide And Polypyrrole/Reduced Graphene Oxide Composite Coated Stretchable Fabric Electrodes For Supercapacitor Application, Chen Zhao, Kewei Shu, Caiyun Wang, Sanjeev Gambhir, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The advent of self-powered functional garments has given rise to a demand for stretchable energy storage devices that are amendable to integration into textile structures. The electromaterials (anode, cathode and separator) are expected to sustain a deformation of 3% to 55% associated with body movement. Here, we report a stretchable fabric supercapacitor electrode using commonly available nylon lycra fabric as the substrate and graphene oxide (GO) as a dyestuff. It was prepared via a facile dyeing approach followed by a mild chemical reduction. This reduced graphene oxide (rGO) coated fabric electrode retains conductivity at an applied strain of up to …
Spin Fluctuations In The Exotic Metallic State Of Sr2ruo4 Studied With Β-Nmr, David L. Cortie, T Buck, M H. Dehn, R F. Kiefl, C D. P Levy, R M. L Mcfadden, G D. Morris, M R. Pearson, Z Salman, Y Maeno, W A. Macfarlane
Spin Fluctuations In The Exotic Metallic State Of Sr2ruo4 Studied With Β-Nmr, David L. Cortie, T Buck, M H. Dehn, R F. Kiefl, C D. P Levy, R M. L Mcfadden, G D. Morris, M R. Pearson, Z Salman, Y Maeno, W A. Macfarlane
Australian Institute for Innovative Materials - Papers
A β-NMR study was performed on a Sr2RuO4 crystal in the metallic state using a beam of spin-polarized 8Li+ implanted at a mean depth of 90 nm. The 8Li+ spin-lattice relaxation rate is strongly influenced by the onset of incommensurate spin fluctuations. The nuclear relaxation rate can be explained using previously published bulk 17O NMR and inelastic neutron spectroscopy measurements of the dynamic magnetic susceptibility to model the hyperfine coupling. A well-resolved quadrupolar-split NMR for 8Li+ implies a static stopping position in an interstitial site. The 8Li+ Knight shift is highly sensitive to the anisotropic static susceptibility.
Visualizing Superconductivity In Fese Nanoflakes On Srtio3 By Scanning Tunneling Microscopy, Zhi Li, Jun-Ping Peng, Hui-Min Zhang, Canli Song, Shuaihua Ji, Lili Wang, Ke He, Xiaowei Chen, Qi-Kun Xue, Xu-Cun Ma
Visualizing Superconductivity In Fese Nanoflakes On Srtio3 By Scanning Tunneling Microscopy, Zhi Li, Jun-Ping Peng, Hui-Min Zhang, Canli Song, Shuaihua Ji, Lili Wang, Ke He, Xiaowei Chen, Qi-Kun Xue, Xu-Cun Ma
Australian Institute for Innovative Materials - Papers
Scanning tunneling microscopy and spectroscopy have been employed to investigate the superconductivity in single unit-cell FeSe nanoflakes on SrTiO3 substrates. We find that the differential conductance dI/dV spectra are spatially nonuniform and fluctuate within the flakes as their area is reduced to below ∼150 nm2. An enhancement in the superconductivity-related gap size as large as 25% is observed. The superconductivity behavior disappears when the FeSe nanoflakes reduce to ∼40 nm2. Compared to a previous report [Wang et al., Chin. Phys. Lett. 29, 037402 (2012)], the gap is asymmetric relative to the Fermi energy EF. All the features, particularly the fluctuating …
Detection Of A Superconducting Phase In A Two-Atom Layer Of Hexagonal Ga Film Grown On Semiconducting Gan(0001), Hui-Min Zhang, Yi Sun, Wei Li, Jun-Ping Peng, Canli Song, Ying Xing, Qinghua Zhang, Jia-Qi Guan, Zhi Li, Yanfei Zhao, Shuaihua Ji, Lili Wang, Ke He, Xi Chen, Lin Gu, Langsheng Ling, Mingliang Tian, Lian Li, X. C Xie, Jianping Liu, Hui Yang, Qi-Kun Xue, Jian Wang, Xu-Cun Ma
Detection Of A Superconducting Phase In A Two-Atom Layer Of Hexagonal Ga Film Grown On Semiconducting Gan(0001), Hui-Min Zhang, Yi Sun, Wei Li, Jun-Ping Peng, Canli Song, Ying Xing, Qinghua Zhang, Jia-Qi Guan, Zhi Li, Yanfei Zhao, Shuaihua Ji, Lili Wang, Ke He, Xi Chen, Lin Gu, Langsheng Ling, Mingliang Tian, Lian Li, X. C Xie, Jianping Liu, Hui Yang, Qi-Kun Xue, Jian Wang, Xu-Cun Ma
Australian Institute for Innovative Materials - Papers
The recent observation of the superconducting state at atomic scale has motivated the pursuit of exotic condensed phases in two-dimensional (2D) systems. Here we report on a superconducting phase in twomonolayer crystalline Ga films epitaxially grown on wide-band-gap semiconductor GaN(0001). This phase exhibits a hexagonal structure and only 0.552 nm in thickness, nevertheless, brings about a superconducting transition temperature Tc as high as 5.4 K, confirmed by in situ scanning tunneling spectroscopy and ex situ electrical magnetotransport and magnetization measurements. The anisotropy of critical magnetic field and Berezinski-Kosterlitz-Thouless-like transition are observed, typical for the 2D superconductivity. Our results demonstrate a …
Origin Of The Enhanced Piezoelectric Thermal Stability In Bisco3-Pbtio3 Single Crystals, Lingping Kong, Gang Liu, Shujun Zhang, Wenge Yang
Origin Of The Enhanced Piezoelectric Thermal Stability In Bisco3-Pbtio3 Single Crystals, Lingping Kong, Gang Liu, Shujun Zhang, Wenge Yang
Australian Institute for Innovative Materials - Papers
BiScO 3 -PbTiO 3 single crystals were reported to possess high piezoelectric coefficient of 1200 pC/N and Curie temperature of > 400°C, exhibiting excellent thermal stability of properties up to 350°C. However, the origin of the thermal stability is yet unclear. In this research, high resolution synchrotron-based technique was used to study the temperature driven structural evolution in BiScO 3 -PbTiO 3 system, where two competing symmetries and local distortion were observed, accounting for the high piezoelectric activity. A strong correlation between thermal stability of structure and temperature-dependent properties was established, which will benefit the design of ferroelectric materials with broad …
Ambient Facile Synthesis Of Gram-Scale Copper Selenide Nanostructures From Commercial Copper And Selenium Powder, Xinqi Chen, Zhen Li, S X. Dou
Ambient Facile Synthesis Of Gram-Scale Copper Selenide Nanostructures From Commercial Copper And Selenium Powder, Xinqi Chen, Zhen Li, S X. Dou
Australian Institute for Innovative Materials - Papers
Grams of copper selenides (Cu2-xSe) were prepared from commercial copper and selenium powders in the presence of thiol ligands by a one-pot reaction at room temperature. The resultant copper selenides are a mixture of nanoparticles and their assembled nanosheets, and the thickness of nanosheets assembled is strongly dependent on the ratio of thiol ligand to selenium powder. The resultant Cu2-xSe (0 ≤ x ≤ 0.25) nanostructures were treated with hydrazine solution to remove the surface ligands and then explored as a potential thermoelectric candidate in comparison with commercial copper selenide powders. The research provides a novel …
Microscopic Model For Exchange Bias From Grain-Boundary Disorder In A Ferromagnet/Antiferromagnet Thin Film With A Nanocrystalline Microstructure, David L. Cortie, A G. Biternas, R W. Chantrell, Xiaolin Wang, Frank Klose
Microscopic Model For Exchange Bias From Grain-Boundary Disorder In A Ferromagnet/Antiferromagnet Thin Film With A Nanocrystalline Microstructure, David L. Cortie, A G. Biternas, R W. Chantrell, Xiaolin Wang, Frank Klose
Australian Institute for Innovative Materials - Papers
Monte Carlo spin simulations were coupled to a Voronoi microstructure-generator to predict the magnitude and behavior of exchange bias in a ferromagnet/antiferromagnet (AF) thin film bilayer with a nanocrystalline microstructure. Our model accounts for the effects of irregular grain-shapes, finite-sized particles, and the possible presence of local random-fields originating from the antiferromagnet's grain-boundary regions. As the grain-boundary represents a crystal-structure distortion, we model the local effect on the exchange constants in the Gaussian approximation which can cause regions resembling a spin glass confined to an unusual 2D topology. Although an ensemble of completely disconnected AF grains isolated by non-magnetic barriers …
Force Control Of A Tri-Layer Conducting Polymer Actuator Using Optimized Fuzzy Logic Control, Mehmet Itik, Mohammadreza Sabetghadam, Gursel Alici
Force Control Of A Tri-Layer Conducting Polymer Actuator Using Optimized Fuzzy Logic Control, Mehmet Itik, Mohammadreza Sabetghadam, Gursel Alici
Australian Institute for Innovative Materials - Papers
Conducting polymers actuators (CPAs) are potential candidates for replacing conventional actuators in various fields, such as robotics and biomedical engineering, due to their advantageous properties, which includes their low cost, light weight, low actuation voltage and biocompatibility. As these actuators are very suitable for use in micro-nano manipulation and in injection devices in which the magnitude of the force applied to the target is of crucial importance, the force generated by CPAs needs to be accurately controlled. In this paper, a fuzzy logic (FL) controller with a Mamdani inference system is designed to control the blocking force of a trilayer …
Uncoupled Surface Spin Induced Exchange Bias In Alpha-Mno2 Nanowires, W Li, R Zeng, Ziqi Sun, Dongliang Tian, S X. Dou
Uncoupled Surface Spin Induced Exchange Bias In Alpha-Mno2 Nanowires, W Li, R Zeng, Ziqi Sun, Dongliang Tian, S X. Dou
Australian Institute for Innovative Materials - Papers
We have studied the microstructure, surface states, valence fluctuations, magnetic properties, and exchange bias effect in MnO2 nanowires. High purity alpha-MnO2 rectangular nanowires were synthesized by a facile hydrothermal method with microwave-assisted procedures. The microstructure analysis indicates that the nanowires grow in the [0 0 1] direction with the (2 1 0) plane as the surface. Mn3+ and Mn2+ ions are not found in the system by X-ray photoelectron spectroscopy. The effective magnetic moment of the manganese ions fits in with the theoretical and experimental values of Mn4+ very well. The uncoupled spins in 3d(3) orbitals of the Mn4+ ions …
Charged-Controlled Separation Of Nitrogen From Natural Gas Using Boron Nitride Fullerene, Qiao Sun, Caixia Sun, Aijun Du, Zhen Li
Charged-Controlled Separation Of Nitrogen From Natural Gas Using Boron Nitride Fullerene, Qiao Sun, Caixia Sun, Aijun Du, Zhen Li
Australian Institute for Innovative Materials - Papers
Natural gas (the main component is methane) has been widely used as a fuel and raw material in industry. Removal of nitrogen (N2) from methane (CH4) can reduce the cost of natural gas transport and improve its efficiency. However, their extremely similar size increases the difficulty of separating N2 from CH4. In this study, we have performed a comprehensive investigation of N2 and CH4 adsorption on different charge states of boron nitride (BN) nanocage fullerene, B36N36, by using a density functional theory approach. The calculational results indicate …
Optical And Electrochemical Methods For Determining The Effective Area And Charge Density Of Conducting Polymer Modified Electrodes For Neural Stimulation, Alexander R. Harris, Paul Molino, Robert M. I Kapsa, Graeme M. Clarke, Antonio Paolini, Gordon G. Wallace
Optical And Electrochemical Methods For Determining The Effective Area And Charge Density Of Conducting Polymer Modified Electrodes For Neural Stimulation, Alexander R. Harris, Paul Molino, Robert M. I Kapsa, Graeme M. Clarke, Antonio Paolini, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Neural stimulation is used in the cochlear implant, bionic eye, and deep brain stimulation, which involves implantation of an array of electrodes into a patient's brain. The current passed through the electrodes is used to provide sensory queues or reduce symptoms associated with movement disorders and increasingly for psychological and pain therapies. Poor control of electrode properties can lead to suboptimal performance; however, there are currently no standard methods to assess them, including the electrode area and charge density. Here we demonstrate optical and electrochemical methods for measuring these electrode properties and show the charge density is dependent on electrode …
Hierarchical Porous Li 2 Mg(Nh)2@C Nanowires With Long Cycle Life Towards Stable Hydrogen Storage, Guanglin Xia, Yingbin Tan, Dan Li, Zaiping Guo, Hua-Kun Liu, Zongwen Liu, Xuebin Yu
Hierarchical Porous Li 2 Mg(Nh)2@C Nanowires With Long Cycle Life Towards Stable Hydrogen Storage, Guanglin Xia, Yingbin Tan, Dan Li, Zaiping Guo, Hua-Kun Liu, Zongwen Liu, Xuebin Yu
Australian Institute for Innovative Materials - Papers
The hierarchical porous Li2Mg(NH)2@C nanowires full of micropores, mesopores, and macropores are successfully fabricated via a single-nozzle electrospinning technique combined with in-situ reaction between the precursors, i.e., MgCl2 and LiN3, under physical restriction upon thermal annealing. The explosive decomposition of LiN3 well dispersed in the electrospun nanowires during carbothermal treatment induces a highly porous structure, which provides a favourable way for H2 delivering in and out of Li2Mg(NH)2 nanoparticles simultaneously realized by the space-confinement of the porous carbon coating. As a result, the thus-fabricated Li2Mg(NH)2 …
Α-Fe2o3/Graphene Nanocomposite As Anode Material For Sodium-Ion Batteries With Enhanced Capacity Retention, Zhijia Zhang, Yunxiao Wang, Shulei Chou, Huijun Li, Hua-Kun Liu, Jiazhao Wang
Α-Fe2o3/Graphene Nanocomposite As Anode Material For Sodium-Ion Batteries With Enhanced Capacity Retention, Zhijia Zhang, Yunxiao Wang, Shulei Chou, Huijun Li, Hua-Kun Liu, Jiazhao Wang
Australian Institute for Innovative Materials - Papers
Among the different energy storage systems, rechargeable lithium-ion batteries (LIBs) have been widely applied in various portable electronic devices due to their high energy densities, long cycle life, and lack of significant memory effect [1]. For wide-scale implementation of renewable energy, LIBs, however, face challenges related to their safety, lifetime, and cost. Based on the wide availability and low cost of sodium, sodium-ion batteries (SIBs) have the potential for meeting the demands of large-scale and sustainable applications. Many cathode materials have been proposed, whereas only a few anode materials have been investigated for SIBs [2]. The sodium ion (1.02 Å) …
Liquid Crystalline Graphene Oxide/Pedot: Pss Self-Assembled 3d Architecture For Binder-Free Supercapacitor Electrodes, Md. Monirul Islam, Alfred T. Chidembo, Seyed Hamed Aboutalebi, Dean Cardillo, Hua-Kun Liu, Konstantin K. Konstantinov, S X. Dou
Liquid Crystalline Graphene Oxide/Pedot: Pss Self-Assembled 3d Architecture For Binder-Free Supercapacitor Electrodes, Md. Monirul Islam, Alfred T. Chidembo, Seyed Hamed Aboutalebi, Dean Cardillo, Hua-Kun Liu, Konstantin K. Konstantinov, S X. Dou
Australian Institute for Innovative Materials - Papers
Binder-free self-assembled 3D architecture electrodes have been fabricated by a novel convenient method. Liquid crystalline graphene oxide was used as precursor to interact with poly(3,4-ethylene-dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) in dispersion in order to form a conductive polymer entrapped, self-assembled layer-by-layer structure. This advanced network containing PEDOT:PSS enabled us to ascribe the superior electrochemical properties of particular graphene sheets. This layer-by-layer self-assembled 3D architecture of best performing composite (reduced graphene oxide-PEDOT:PSS 25) showed excellent electrochemical performance of 434 F g−1 through chemical treatment. To highlight these advances, we further explored the practicality of the as-prepared electrode by varying the composite material content. …
Large Scale Production Of Novel G-C3n4 Micro Strings With High Surface Area And Versatile Photodegradation Ability, Muhammad Nawaz Tahir, Chuanbao Cao, Faheem K. Butt, Sajid Butt, Faryal Idrees, Zulfiqar Ali, Imran Aslam, M Tanveer, Asif Mahmood, Nasir Mahmood
Large Scale Production Of Novel G-C3n4 Micro Strings With High Surface Area And Versatile Photodegradation Ability, Muhammad Nawaz Tahir, Chuanbao Cao, Faheem K. Butt, Sajid Butt, Faryal Idrees, Zulfiqar Ali, Imran Aslam, M Tanveer, Asif Mahmood, Nasir Mahmood
Australian Institute for Innovative Materials - Papers
An easy, scalable and environmentally benign chemical method has been developed to synthesize micro strings of graphitic-C3N4 (msg-C3N4) through pre-treatment of melamine with HNO 3 in alkaline solvent at low temperature. This methodology results in a unique string type morphology of msg-C3N4 with higher surface area. These msg-C3N4 micro strings were used as a photocatalyst under visible light for photodegradation of rhodamine B, methyl blue and methyl orange. The msg-C3N4 shows enhanced photodegradation efficiency due to its high surface area and favourable bandgap. The first order rate constant for msg-C3N4 was measured which confirms the higher performance of msg-C3N4 in …
Microemulsion-Assisted Synthesis Of Nanosized Li-Mn-O Spinel Cathodes For High-Rate Lithium-Ion Batteries, Xianhong Rui, Wenping Sun, Qingyu Yan, Tuti M. Lim, Maria Skyllas-Kazacos
Microemulsion-Assisted Synthesis Of Nanosized Li-Mn-O Spinel Cathodes For High-Rate Lithium-Ion Batteries, Xianhong Rui, Wenping Sun, Qingyu Yan, Tuti M. Lim, Maria Skyllas-Kazacos
Australian Institute for Innovative Materials - Papers
Li1.16Mn1.84O4 nanoparticles (50-90 nm) with cubic spinel structure are synthesized by combining a microemulsion process to produce ultrafine Mn(OH)2 nanocrystals (3-8 nm) with a solid-state lithiation step. The nanostructured lithium-rich Li1.16Mn1.84O4 shows stable cycling performance and superior rate capabilities as compared with the corresponding bulk material, for example, the nano-sized Li1.16Mn1.84O4 electrode shows stable reversible capacities of 74 mAhg-1 during the 1000th cycle at a high rate of 40 C between 3.0 and 4.5 V. In addition, Li1.16Mn1.84O4 nanoparticles also show high Li storage properties over an enlarged voltage window of 2.0-4.5 V with high capacities and stable cyclability, for …
Hydrostatic Piezoelectric Properties Of [011] Poled Pb(Mg 1/3nb2/3)O3-Pbtio3 Single Crystals And 2-2 Lamellar Composites, Lili Li, Shujun Zhang, Zhuo Xu, Xuecang Geng, Fei Wen, Jun Luo, Thomas R. Shrout
Hydrostatic Piezoelectric Properties Of [011] Poled Pb(Mg 1/3nb2/3)O3-Pbtio3 Single Crystals And 2-2 Lamellar Composites, Lili Li, Shujun Zhang, Zhuo Xu, Xuecang Geng, Fei Wen, Jun Luo, Thomas R. Shrout
Australian Institute for Innovative Materials - Papers
The hydrostatic piezoelectric properties of [011] poled Pb(Mg 1/3Nb2/3)O3-PbTiO3 (PMN-PT) crystals and corresponding 2-2 crystal/epoxy composites were investigated. The crystal volume ratio and compositional dependencies of the hydrostatic charge and voltage coefficients (dh and gh) and hydrostatic figure of merit (FOM) dh x gh were determined, where large FOM value of 3.2 pm2/N with high stability as a function of hydrostatic pressure was achieved for rhombohedral crystal composites. In addition, the stress amplification effects of the face-plate and different epoxy matrixes were investigated, with maximum FOM value being on the order of 92 pm2/N, indicating that 2-2 crystal/epoxy composites are …
Β-Detected Nmr Of 8li+ In Bi, Sb, And The Topological Insulator Bi0.9sb0.1, W A. Macfarlane, C B. L Tschense, T Buck, K H. Chow, David L. Cortie, A Hariwal, R F. Kiefl, D Koumoulis, C D. P Levy, I Mckenzie, F H. Mcgee, G D. Morris, M R. Pearson, Q Song, D Wang, Y S. Hor, R J. Cava
Β-Detected Nmr Of 8li+ In Bi, Sb, And The Topological Insulator Bi0.9sb0.1, W A. Macfarlane, C B. L Tschense, T Buck, K H. Chow, David L. Cortie, A Hariwal, R F. Kiefl, D Koumoulis, C D. P Levy, I Mckenzie, F H. Mcgee, G D. Morris, M R. Pearson, Q Song, D Wang, Y S. Hor, R J. Cava
Australian Institute for Innovative Materials - Papers
We report the NMR Knight shift and spin-lattice relaxation of Li8+ implanted ¿100 nm into single crystals of semimetallic Sb, Bi, and topologically insulating Bi0.9Sb0.1. We find small negative shifts (of order 100 ppm) in all three. In the insulator, the shift is nearly temperature independent, while in Bi and Sb it becomes more negative at low temperature without following the bulk susceptibility, suggesting two distinct temperature dependent contributions, possibly from the orbital and spin response. However, a simple model is unable to account for the observed shift. The spin-lattice relaxation differs in both scale and temperature dependence in all …
Dichotomy Of The Electronic Structure And Superconductivity Between Single-Layer And Double-Layer Fese/Srtio3 Films, Xu Liu, Defa Liu, Wenchao Zhang, Junfeng He, Lin Zhao, Shaolong He, Daixiang Mou, Fangsen Li, Chenjia Tang, Zhi Li, Lili Wang, Yingying Peng, Yan Liu, Chaoyu Chen, Guodong Liu, Xiaoli Dong, Jun Zhang, Chuangtian Chen, Zuyan Xu, Xi Chen, Xu-Cun Ma, Qi-Kun Xue, X J. Zhou
Dichotomy Of The Electronic Structure And Superconductivity Between Single-Layer And Double-Layer Fese/Srtio3 Films, Xu Liu, Defa Liu, Wenchao Zhang, Junfeng He, Lin Zhao, Shaolong He, Daixiang Mou, Fangsen Li, Chenjia Tang, Zhi Li, Lili Wang, Yingying Peng, Yan Liu, Chaoyu Chen, Guodong Liu, Xiaoli Dong, Jun Zhang, Chuangtian Chen, Zuyan Xu, Xi Chen, Xu-Cun Ma, Qi-Kun Xue, X J. Zhou
Australian Institute for Innovative Materials - Papers
The latest discovery of possible high-temperature superconductivity in the single-layer FeSe film grown on a SrTiO3 substrate has generated much attention. Initial work found that, while the single-layer FeSe/SrTiO3 film exhibits a clear signature of superconductivity, the double-layer film shows an insulating behaviour. Such a marked layer-dependent difference is surprising and the underlying origin remains unclear. Here we report a comparative angleresolved photoemission study between the single-layer and double-layer FeSe/SrTiO3 films annealed in vacuum. We find that, different from the single-layer FeSe/SrTiO3 film, the double-layer FeSe/SrTiO3 film is hard to get doped and remains in the semiconducting/ insulating state under …
Three-Dimensional-Network Li3v2(Po4) 3/C Composite As High Rate Lithium Ion Battery Cathode Material And Its Compatibility With Ionic Liquid Electrolytes, Jiantie Xu, Shulei Chou, Cuifeng Zhou, Qinfen Gu, Hua-Kun Liu, S X. Dou
Three-Dimensional-Network Li3v2(Po4) 3/C Composite As High Rate Lithium Ion Battery Cathode Material And Its Compatibility With Ionic Liquid Electrolytes, Jiantie Xu, Shulei Chou, Cuifeng Zhou, Qinfen Gu, Hua-Kun Liu, S X. Dou
Australian Institute for Innovative Materials - Papers
A high performance Li3V2(PO4)3 cathode material for lithium ion batteries was synthesized by the microwave-assisted hydrothermal method followed by a post annealing process. The synchrotron X-ray diffraction analysis results confirmed that single-phase Li3V2(PO4)3 with monoclinic structure was obtained. Scanning electron microscope and transmission electron microscope images revealed that the as-prepared Li3V 2(PO4)3 was composed of nanowires and microsized particles. Electrochemical results demonstrated that the Li 3V2(PO4)3 electrode measured at 10 C after 500 cycles can deliver discharge capacities of 85.4 mAh g-1 and 103.4 mAh g-1, with a capacity retention of 99.3% and 95.9%, in the voltage ranges of 3.0-4.3 …
Formation And Processability Of Liquid Crystalline Dispersion Graphene Oxide, Rouhollah Jalili, Seyed Hamed Aboutalebi, Dorna Esrafilzadeh, Konstantin Konstantinov, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace
Formation And Processability Of Liquid Crystalline Dispersion Graphene Oxide, Rouhollah Jalili, Seyed Hamed Aboutalebi, Dorna Esrafilzadeh, Konstantin Konstantinov, Joselito M. Razal, Simon E. Moulton, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Rational control over the formation and processability, and consequently final properties of graphene oxide liquid crystalline dispersions has been a long-standing goal in the development of bottom-up device fabrication processes. Here we report, the principal conditions through which such levels of control can be exercised to fine-tune dispersion properties for further processing.
Exchange Interaction Mediated Ferroelectricity In Multiferroic Mntio3 With Anisotropic Orbital Hybridization And Hole Delocalization, Shiwei Chen, Paoan Lin, Horngtay Jeng, S W. Fu, Jennmin Lee, Jyhfu Lee, Chihwen Pao, Hirofumi Ishii, Kuding Tsuei, Nozomu Hiraoka, Dapeng Chen, S X. Dou, Xiaolin Wang, Kueihtzu Lu, Jinming Chen
Exchange Interaction Mediated Ferroelectricity In Multiferroic Mntio3 With Anisotropic Orbital Hybridization And Hole Delocalization, Shiwei Chen, Paoan Lin, Horngtay Jeng, S W. Fu, Jennmin Lee, Jyhfu Lee, Chihwen Pao, Hirofumi Ishii, Kuding Tsuei, Nozomu Hiraoka, Dapeng Chen, S X. Dou, Xiaolin Wang, Kueihtzu Lu, Jinming Chen
Australian Institute for Innovative Materials - Papers
We present the orbital structure of MnTiO3 with polarization dependent x-ray absorption and resonant x-ray emission spectra accompanied with electronic structure calculations. The results clearly indicate a strongly anisotropic O 2p-Mn 3d orbital hybridization whereas the Mn 3d hole state shows a highly delocalized characteristic ascribed to the 3d-4p mixing. The extended Mn 4p orbital could enhance the exchange interaction between Mn (3d)-O (2p)-Mn (3d) leading to an asymmetric charge distribution in Mn-O bonds. The delocalized characteristic of Mn 3d holes is indispensable to the mechanism of spin-dependent-metal-ligand hybridization to explain magnetically induced ferroelectricity.
Fast And Rewritable Colloidal Assembly Via Field Synchronized Particle Swapping, Pietro Tierno, Tom H. Johansen, Thomas M. Fischer
Fast And Rewritable Colloidal Assembly Via Field Synchronized Particle Swapping, Pietro Tierno, Tom H. Johansen, Thomas M. Fischer
Australian Institute for Innovative Materials - Papers
We report a technique to realize reconfigurable colloidal crystals by using the controlled motion of particle defects above an externally modulated magnetic substrate. The transport of particles is induced by applying a uniform rotating magnetic field to a ferrite garnet film characterized by a periodic lattice of magnetic bubbles. For filling factor larger than one colloid per bubble domain, the particle current arises from propagating defects where particles synchronously exchange their position when passing from one occupied domain to the next. The amplitude of an applied alternating magnetic field can be used to displace the excess particles via a swapping …
Pressure Induced Magneto-Structural Phase Transitions In Layered Rmn2x2 Compounds (Invited), Shane Kennedy, Jianli Wang, Stewart Campbell, Michael Hofmann, S X. Dou
Pressure Induced Magneto-Structural Phase Transitions In Layered Rmn2x2 Compounds (Invited), Shane Kennedy, Jianli Wang, Stewart Campbell, Michael Hofmann, S X. Dou
Australian Institute for Innovative Materials - Papers
We have studied a range of pseudo-ternaries derived from the parent compound PrMn2 Ge 2, substituting for each constituent element with a smaller one to contract the lattice. This enables us to observe the magneto-elastic transitions that occur as the Mn-Mn nearest neighbour distance is reduced and to assess the role of Pr on the magnetism. Here, we report on the PrMn2 Ge 2−xSix, Pr1−xYxMn2 Ge 2, and PrMn2−xFex Ge 2 systems. The pressure produced by chemical substitution in these pseudo-ternaries is inherently non-uniform, with local pressure variations dependent on the local atomic distribution. We find that concentrated chemical substitution …
Recent Progress In Thermoelectric Materials, Chao Han, Zhen Li, S X. Dou
Recent Progress In Thermoelectric Materials, Chao Han, Zhen Li, S X. Dou
Australian Institute for Innovative Materials - Papers
Direct conversion of heat into electricity through advanced thermoelectric (TE) materials has been one of the most attractive solutions to the severe environmental and energy issues facing humanity. In recent years, great progress has been made in improving their dimensionless figure of merit (ZT), which determines the conversion efficiency of TE devices. ZT is related to three “interlocked” factors—the Seebeck coefficient, electrical conductivity, and thermal conductivity. These three factors are interdependent in bulk TE materials, and altering one changes the other two. The difficulty in simultaneously optimizing them caused TE research to stagnate, until great reductions in thermal conductivity were …
Fully Roll-To-Roll Gravure Printable Wireless (13.56 Mhz) Sensor-Signage Tags For Smart Packaging, Hwiwon Kang, Hyejin Park, Yongsu Park, Minhoon Jung, Byung Chul Kim, Gordon G. Wallace, Gyoujin Cho
Fully Roll-To-Roll Gravure Printable Wireless (13.56 Mhz) Sensor-Signage Tags For Smart Packaging, Hwiwon Kang, Hyejin Park, Yongsu Park, Minhoon Jung, Byung Chul Kim, Gordon G. Wallace, Gyoujin Cho
Australian Institute for Innovative Materials - Papers
Integration of sensing capabilities with an interactive signage through wireless communication is enabling the development of smart packaging wherein wireless (13.56 MHz) power transmission is used to interlock the smart packaging with a wireless (13.56 MHz) reader or a smart phone. Assembly of the necessary componentry for smart packaging on plastic or paper foils is limited by the manufacturing costs involved with Si based technologies. Here, the issue of manufacturing cost for smart packaging has been obviated by materials that allow R2R (roll-to-roll) gravure in combination with R2R coating processes to be employed. R2R gravure was used to print the …
Applications Of Scanning Electrochemical Microscopy (Secm) For Local Characterization Of Az31 Surface During Corrosion In A Buffered Media, Sina S. Jamali, Simon E. Moulton, Dennis E. Tallman, Maria Forsyth, Jan Weber, Gordon G. Wallace
Applications Of Scanning Electrochemical Microscopy (Secm) For Local Characterization Of Az31 Surface During Corrosion In A Buffered Media, Sina S. Jamali, Simon E. Moulton, Dennis E. Tallman, Maria Forsyth, Jan Weber, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Different modes of scanning electrochemical mapping (SECM) such as surface generation/tip collection (SG/TC), amperometry, AC-SECM and potentiometry were employed to characterize the active/passive domains, hydrogen gas (H2) evolution and local pH on a corroding surface of AZ31 in simulated biological fluid (SBF). It was found that the main domains of H2 evolution are associated with lower insulating properties of the surface as well as higher local pH. The near surface pH was found to be highly alkaline indicating that, even in a buffered solution such as SBF, the local pH on a corroding AZ31 surface can be significantly different to …