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Articles 481 - 510 of 1524
Full-Text Articles in Physical Sciences and Mathematics
Spin Texture On Top Of Flux Avalanches In Nb/Al2o3/Co Thin Film Heterostructures, R F. Lopes, D Carmo, F Colauto, Wilson Aires Ortiz, A M H De Andrade, Tom H. Johansen, E Baggio-Saitovitch, P Pureur
Spin Texture On Top Of Flux Avalanches In Nb/Al2o3/Co Thin Film Heterostructures, R F. Lopes, D Carmo, F Colauto, Wilson Aires Ortiz, A M H De Andrade, Tom H. Johansen, E Baggio-Saitovitch, P Pureur
Australian Institute for Innovative Materials - Papers
We report on magneto-optical imaging, magnetization, Hall effect, and magneto-resistance experiments in Nb/Al2O3/Co thin film heterostructures. The magneto-transport measurements were performed in samples where electrical contacts were placed on the Co layer. The magnetic field is applied perpendicularly to the plane of the film and gives rise to abrupt flux penetration of dendritic form. A magnetization texture is imprinted in the Co layer in perfect coincidence with these ramifications. The spin domains that mimic the vortex dendrites are stable upon the field removal. Moreover, the imprinted spin structure remains visible up to room temperature. In the region of the field-temperature …
Effective Area And Charge Density Of Iridium Oxide Neural Electrodes, Alexander R. Harris, Antonio G. Paolini, Gordon G. Wallace
Effective Area And Charge Density Of Iridium Oxide Neural Electrodes, Alexander R. Harris, Antonio G. Paolini, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The effective electrode area and charge density of iridium metal and anodically activated iridium has been measured by optical and electrochemical techniques. The degree of electrode activation could be assessed by changes in electrode colour. The reduction charge, activation charge, number of activation pulses and charge density were all strongly correlated. Activated iridium showed slow electron transfer kinetics for reduction of a dissolved redox species. At fast voltammetric scan rates the linear diffusion electroactive area was unaffected by iridium activation. At slow voltammetric scan rates, the steady state diffusion electroactive area was reduced by iridium activation. The steady state current …
Nanoscale Analyses Of The Surface Structure And Composition Of Biochars Extracted From Field Trials Or After Co-Composting Using Advanced Analytical Electron Microscopy, B Archanjo, M Mendoza, M Albu, David R. G Mitchell, N Hagemann, C Mayrhofer, Thi Mai, Zhe Weng, A Kappler, S Behrens, Paul R. Munroe, C Achete, Scott Donne, J R. Araujo, Lukas Van Zwieten, Josip Horvat, A Enders, Stephen D. Joseph
Nanoscale Analyses Of The Surface Structure And Composition Of Biochars Extracted From Field Trials Or After Co-Composting Using Advanced Analytical Electron Microscopy, B Archanjo, M Mendoza, M Albu, David R. G Mitchell, N Hagemann, C Mayrhofer, Thi Mai, Zhe Weng, A Kappler, S Behrens, Paul R. Munroe, C Achete, Scott Donne, J R. Araujo, Lukas Van Zwieten, Josip Horvat, A Enders, Stephen D. Joseph
Australian Institute for Innovative Materials - Papers
Biochars have been recognized as an important material to improve soil properties. In a number of studies their beneficial properties have been found to increase with residence time in soil and during the composting process. The beneficial properties have been correlated with surface functional groups resulting from the interactions between char particles, inorganic and organic matter in the soil and soil biota. These interactions result in the formation of organo-mineral phases on the internal and external surfaces of the biochar. A paucity of information exists, particularly from longer-term field trials, on organo-mineral phases present on both the internal and external …
Graphene Aerogel Supported Crystalline Zno@Amorphous Zn2geo4 Core-Shell Hierarchical Structure For Lithium Storage, Meng Jiang, Tengfei Zhou, Wei Liu, Chuanqi Feng, Jianwen Liu, Zaiping Guo
Graphene Aerogel Supported Crystalline Zno@Amorphous Zn2geo4 Core-Shell Hierarchical Structure For Lithium Storage, Meng Jiang, Tengfei Zhou, Wei Liu, Chuanqi Feng, Jianwen Liu, Zaiping Guo
Australian Institute for Innovative Materials - Papers
Fabricating a combined amorphous and crystalline hierarchical structure is a promising strategy to further improve the electrochemical performance of electrode materials, because it will provide additional opportunities for altering and manipulating the electrolyte adsorption and ion migratory dynamics in the lithium storage process. In this work, a crystalline-amorphous core-shell ZnO/Zn2GeO4/graphene aerogel with a three-dimensional structure has been successfully fabricated and shows enhanced stability and electrochemical performances.
New Insight Into Magneto-Structural Phase Transitions In Layered Tbmn2 Ge2-Based Compounds, Chunsheng Fang, Guoxing Li, Jian Li Wang, Wayne D. Hutchison, Qing Yon Ren, Zhenyan Deng, Guohong Ma, Shi Xue Dou, Stewart J. Campbell, Zhenxiang Cheng
New Insight Into Magneto-Structural Phase Transitions In Layered Tbmn2 Ge2-Based Compounds, Chunsheng Fang, Guoxing Li, Jian Li Wang, Wayne D. Hutchison, Qing Yon Ren, Zhenyan Deng, Guohong Ma, Shi Xue Dou, Stewart J. Campbell, Zhenxiang Cheng
Australian Institute for Innovative Materials - Papers
The Tb1−xYxMn2Ge2 series (x = 0, 0.1, 0.2) compounds are found to exhibit two magnetic phase transitions with decreasing temperature: from the paramagnetic state to the antiferromagnetic interlayer state at TNinter and from an antiferromagnetic interlayer structure to a collinear ferrimagnetic interlayer structure at TCinter. Compared with the slight change of TNinter (409 K, 410 K and 417 K for x = 0, 0.1 and 0.2 respectively), the replacement of Y for Tb leads to a significant decrease in TCinter from 97.5 K for x = 0 to 74.6 K for x = 0.2. The variation in TCinter can be …
Probe Sensor Using Nanostructured Multi-Walled Carbon Nanotube Yarn For Selective And Sensitive Detection Of Dopamine, Wed Al-Graiti, Zhilian Yue, Javad Foroughi, Xu-Feng Huang, Gordon G. Wallace, Ray H. Baughman, Jun Chen
Probe Sensor Using Nanostructured Multi-Walled Carbon Nanotube Yarn For Selective And Sensitive Detection Of Dopamine, Wed Al-Graiti, Zhilian Yue, Javad Foroughi, Xu-Feng Huang, Gordon G. Wallace, Ray H. Baughman, Jun Chen
Australian Institute for Innovative Materials - Papers
The demands for electrochemical sensor materials with high strength and durability in physiological conditions continue to grow and novel approaches are being enabled by the advent of new electromaterials and novel fabrication technologies. Herein, we demonstrate a probe-style electrochemical sensor using highly flexible and conductive multi-walled carbon nanotubes (MWNT) yarns. The MWNT yarn-based sensors can be fabricated onto micro Pt-wire with a controlled diameter varying from 100 to 300 µm, and then further modified with Nafion via a dip-coating approach. The fabricated micro-sized sensors were characterized by electron microscopy, Raman, FTIR, electrical, and electrochemical measurements. For the first time, the …
Self-Assembly Of Flexible Free-Standing 3d Porous Mos2-Reduced Graphene Oxide Structure For High-Performance Lithium-Ion Batteries, Yunfeng Chao, Rouhollah Jalili, Yu Ge, Caiyun Wang, Tian Zheng, Kewei Shu, Gordon G. Wallace
Self-Assembly Of Flexible Free-Standing 3d Porous Mos2-Reduced Graphene Oxide Structure For High-Performance Lithium-Ion Batteries, Yunfeng Chao, Rouhollah Jalili, Yu Ge, Caiyun Wang, Tian Zheng, Kewei Shu, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Flexible freestanding electrodes are highly desired to realize wearable/flexible batteries as required for the design and production of flexible electronic devices. Here, the excellent electrochemical performance and inherent flexibility of atomically thin 2D MoS2 along with the self-assembly properties of liquid crystalline graphene oxide (LCGO) dispersion are exploited to fabricate a porous anode for high-performance lithium ion batteries. Flexible, free-standing MoS2-reduced graphene oxide (MG) film with a 3D porous structure is fabricated via a facile spontaneous self-assembly process and subsequent freeze-drying. This is the first report of a one-pot self-assembly, gelation, and subsequent reduction of MoS2/LCGO composite to form a …
Hollow Carbon Nanobubbles: Monocrystalline Mof Nanobubbles And Their Pyrolysis, Wei Zhang, Xiangfen Jiang, Yanyi Zhao, Arnau Carne-Sanchez, Victor Malgras, Jeonghun Kim, Jung Ho Kim, Shaobin Wang, Jian Liu, Ji-Sen Jiang, Yusuke Yamauchi, Ming Hu
Hollow Carbon Nanobubbles: Monocrystalline Mof Nanobubbles And Their Pyrolysis, Wei Zhang, Xiangfen Jiang, Yanyi Zhao, Arnau Carne-Sanchez, Victor Malgras, Jeonghun Kim, Jung Ho Kim, Shaobin Wang, Jian Liu, Ji-Sen Jiang, Yusuke Yamauchi, Ming Hu
Australian Institute for Innovative Materials - Papers
While bulk-sized metal-organic frameworks (MOFs) face limits to their utilization in various research fields such as energy storage applications, nanoarchitectonics is believed to be a possible solution. It is highly challenging to realize MOF nanobubbles with monocrystalline frameworks. By a spatially controlled etching approach, here, we can achieve the synthesis of zeolitic imidazolate framework (ZIF-8) nanobubbles with a uniform size of less than 100 nm. Interestingly, the ZIF-8 nanobubbles possess a monocrystalline nanoshell with a thickness of around 10 nm. Under optimal pyrolytic conditions, the ZIF-8 nanobubbles can be converted into hollow carbon nanobubbles while keeping their original shapes. The …
Prussian Blue Derived Iron Oxide Nanoparticles Wrapped In Graphene Oxide Sheets For Electrochemical Supercapacitors, Shunsuke Tanaka, Rahul R. Salunkhe, Yusuf Valentino Kaneti, Victor Malgras, Saad M. Alshehri, Tansir Ahamad, Mohamed B. Zakaria, Shi Xue Dou, Yusuke Yamauchi, Md. Shahriar Al Hossain
Prussian Blue Derived Iron Oxide Nanoparticles Wrapped In Graphene Oxide Sheets For Electrochemical Supercapacitors, Shunsuke Tanaka, Rahul R. Salunkhe, Yusuf Valentino Kaneti, Victor Malgras, Saad M. Alshehri, Tansir Ahamad, Mohamed B. Zakaria, Shi Xue Dou, Yusuke Yamauchi, Md. Shahriar Al Hossain
Australian Institute for Innovative Materials - Papers
Hybrid materials have shown promising potential for energy storage applications, such as supercapacitors due to the combined properties or advantages of two (or more) individual constituents. In this work, we report the fabrication of a new composite which combines graphene oxide (GO) sheets with Prussian blue (PB) nanoparticles, which act as a precursor for iron oxide (IO). The GO/PB composite precursors with different GO:PB ratios can be successfully converted into nanoporous GO/IO hybrid composites through a thermal treatment in air at 400 °C. In the resulting GO/IO composites, the GO sheets are efficiently spaced due to the insertion of IO …
Superior Li Storage Anode Based On Novel Fe-Sn-P Alloy Prepared By Electroplating, Xiao Zheng, Peng Zhang, Liang Wang, Shan Tao, Yunxiao Wang, Ling Huang, Jun-Tao Li, Shi-Gang Sun
Superior Li Storage Anode Based On Novel Fe-Sn-P Alloy Prepared By Electroplating, Xiao Zheng, Peng Zhang, Liang Wang, Shan Tao, Yunxiao Wang, Ling Huang, Jun-Tao Li, Shi-Gang Sun
Australian Institute for Innovative Materials - Papers
Novel ternary Fe-Sn-P alloys prepared by simple single-step electrodeposition are investigated as promising anodes for Li-ion batteries. The Fe 51 Sn 38 P 11 electrode, in particular, shows outstanding Li-storage properties, with initial specific discharge/charge capacities of 857.8 and 655 mA h g ¿1 , respectively. The reversible capacity remains stable at 427 mA h g ¿1 , even after 90 cycles, corresponding to a coulombic efficiency of 96% and a capacity retention of 65%. The cauliflower-like morphology of the above anode is well preserved after 90 cycles, suggesting that this alloy could significantly mitigate the electrode volume expansion by …
High-Strength Graphene And Polyacrylonitrile Composite Fiber Enhanced By Surface Coating With Polydopamine, Hyunsoo Kim, Rouhollah Jalili, Geoffrey M. Spinks, Gordon G. Wallace, Seon Jeong Kim
High-Strength Graphene And Polyacrylonitrile Composite Fiber Enhanced By Surface Coating With Polydopamine, Hyunsoo Kim, Rouhollah Jalili, Geoffrey M. Spinks, Gordon G. Wallace, Seon Jeong Kim
Australian Institute for Innovative Materials - Papers
Carbon fibers are well-known reinforcing elements in advanced composites, but these materials remain expensive partly due to the complex processing methods used to form high strength and high modulus fibers. Graphene is seen as an alternative precursor for the formation of high strength carbon-based fibers. Here it is shown that the strength and modulus of graphene-based fibers are enhanced by incorporating a polyacrylonitrile (PAN) binder, surface coating with polydopamine (PDA) and through appropriate pyrolysis heat treatments. Fiber samples were prepared by a wet-spinning method such that the composition of liquid-crystalline graphene oxide (LCGO) and PAN could be varied over the …
A Simple Silver Nanowire Patterning Method Based On Poly(Ethylene Glycol) Photolithography And Its Application For Soft Electronics, Youngsang Ko, Jeonghun Kim, Dabum Kim, Yusuke Yamauchi, Jung Ho Kim, Jungmok You
A Simple Silver Nanowire Patterning Method Based On Poly(Ethylene Glycol) Photolithography And Its Application For Soft Electronics, Youngsang Ko, Jeonghun Kim, Dabum Kim, Yusuke Yamauchi, Jung Ho Kim, Jungmok You
Australian Institute for Innovative Materials - Papers
Hydrogel-based flexible microelectrodes have garnered considerable attention recently for soft bioelectronic applications. We constructed silver nanowire (AgNW) micropatterns on various substrates, via a simple, cost-effective, and eco-friendly method without aggressive etching or lift-off processes. Polyethylene glycol (PEG) photolithography was employed to construct AgNW patterns with various shapes and sizes on the glass substrate. Based on a second hydrogel gelation process, AgNW patterns on glass substrate were directly transferred to the synthetic/natural hydrogel substrates. The resultant AgNW micropatterns on the hydrogel exhibited high conductivity (ca. 8.40 x 103 S cm-1) with low sheet resistance (7.51 ± 1.11¿/sq), excellent bending durability (increases …
3d-Printed Conical Arrays Of Tio2 Electrodes For Enhanced Photoelectrochemical Water Splitting, Chong Yong Lee, Adam Taylor, Stephen T. Beirne, Gordon G. Wallace
3d-Printed Conical Arrays Of Tio2 Electrodes For Enhanced Photoelectrochemical Water Splitting, Chong Yong Lee, Adam Taylor, Stephen T. Beirne, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Control over the topography of semiconducting materials can lead to enhanced performances in photoelectrochemical related applications. One means of implementing this is through direct patterning of metal-based substrates, though this is inadequately developed. Conventional techniques for patterned fabrication commonly involve technologically demanding and tedious processes. 3D printing, a form of additive fabrication, enables creation of a 3D object by deposition of successive layers of material via computer control. In this work, the feasibility of fabricating metal-based 3D printed photoelectrodes is explored. Electrodes comprised of conical arrays are fabricated and the performance for photoelectrochemical water splitting is further enhanced by the …
3d Bioprinting Human Induced Pluripotent Stem Cell Constructs For In Situ Cell Proliferation And Successive Multilineage Differentiation, Qi Gu, Eva Tomaskovic-Crook, Gordon G. Wallace, Jeremy Micah Crook
3d Bioprinting Human Induced Pluripotent Stem Cell Constructs For In Situ Cell Proliferation And Successive Multilineage Differentiation, Qi Gu, Eva Tomaskovic-Crook, Gordon G. Wallace, Jeremy Micah Crook
Australian Institute for Innovative Materials - Papers
The ability to create 3D tissues from induced pluripotent stem cells (iPSCs) is poised to revolutionize stem cell research and regenerative medicine, including individualized, patient-specific stem cell-based treatments. There are, however, few examples of tissue engineering using iPSCs. Their culture and differentiation is predominantly planar for monolayer cell support or induction of self-organizing embryoids (EBs) and organoids. Bioprinting iPSCs with advanced biomaterials promises to augment efforts to develop 3D tissues, ideally comprising direct-write printing of cells for encapsulation, proliferation, and differentiation. Here, such a method, employing a clinically amenable polysaccharide-based bioink, is described as the first example of bioprinting human …
The Origin Of Enhanced Photocatalytic Activities Of Hydrogenated Tio2 Nanoparticles, Yani Liu, Haifeng Feng, Xiaobing Yan, Jiaou Wang, Huagui Yang, Yi Du, Weichang Hao
The Origin Of Enhanced Photocatalytic Activities Of Hydrogenated Tio2 Nanoparticles, Yani Liu, Haifeng Feng, Xiaobing Yan, Jiaou Wang, Huagui Yang, Yi Du, Weichang Hao
Australian Institute for Innovative Materials - Papers
The photocatalytic activity of semiconductors is largely governed by their light absorption, separation of photoinduced charge carriers and surface catalytically active sites, which are primarily controlled by the morphology, crystalline size, structure, and especially the electronic structure of photocatalysts. Black TiO 2 is recognized as one of the most promising visible-light photocatalysts, due to its significantly enhanced visible-light photocatalytic performance in comparison to intrinsic TiO 2 . In this work, black TiO 2 is synthesized through the hydrogenation process. The sample shows a TiO 2 @TiO 2-x core/shell structure which is attributed to hydrogenation. By using X-ray photoelectron spectroscopy (XPS), …
Role Of Atomic Interaction In Electronic Hybridization In Two-Dimensional Ag2ge Nanosheets, Yundan Liu, Jincheng Zhuang, Chen Liu, Jiaou Wang, Xun Xu, Zhi Li, Jianxin Zhong, Yi Du
Role Of Atomic Interaction In Electronic Hybridization In Two-Dimensional Ag2ge Nanosheets, Yundan Liu, Jincheng Zhuang, Chen Liu, Jiaou Wang, Xun Xu, Zhi Li, Jianxin Zhong, Yi Du
Australian Institute for Innovative Materials - Papers
We performed low-temperature scanning tunneling microscopy, low-energy electron diffraction, angle-resolved photoemission spectroscopy, and in situ Raman spectroscopy to investigate the exotic electronic characteristics of the two-dimensional Ag 2 Ge surface alloy associated with Ge-Ag interactions. The dynamics of Ge insertion into the Ag(111) substrate has been identified, which is distinct due to the metalloid nature of Ge. The ordered structure of the Ag 2 Ge alloy is determined by the Ag-Ge interaction, which can be controlled by the coverage of Ge atoms on the Ag(111) surface. The linear dispersions of surface states across the Fermi level have been identified in …
Effect Of Anisotropic Thermal Expansion On The Torsional Actuation Of Twist Oriented Polymer Fibres, Shazed Aziz, Sina Naficy, Javad Foroughi, Hugh Ralph Brown, Geoffrey M. Spinks
Effect Of Anisotropic Thermal Expansion On The Torsional Actuation Of Twist Oriented Polymer Fibres, Shazed Aziz, Sina Naficy, Javad Foroughi, Hugh Ralph Brown, Geoffrey M. Spinks
Australian Institute for Innovative Materials - Papers
Torsional actuation of twisted polymer fibres is the basis for high performance tensile actuation when these fibres are formed into coils. The thermally-induced torsional actuation of twisted polyamide-6 fibres can be predicted by a single helix approximation when the measured diameter and length direction thermal expansion coefficients are known. The single helix model illustrates the sensitivity of the magnitude of torsional actuation to the volume expansion anisotropy for a given volume change. The applicability of the model has been further assessed by investigating three polymer fibres that display different thermal expansion anisotropies. Commercially available polyethylene, polypropylene and polyamide-6 fibres were …
Intrinsic And Spatially Nonuniform Ferromagnetism In Co-Doped Zno Films, L T. Tseng, A Suter, Y R. Wang, Feixiang Xiang, P Bian, X Ding, A Tseng, H L. Hu, Huiqing Fan, Rongkun Zheng, Xiaolin Wang, Z Salman, T Prokscha, Katsuaki Suzuki, R Liu, Sean Li, E Morenzoni, Jiabao Yi
Intrinsic And Spatially Nonuniform Ferromagnetism In Co-Doped Zno Films, L T. Tseng, A Suter, Y R. Wang, Feixiang Xiang, P Bian, X Ding, A Tseng, H L. Hu, Huiqing Fan, Rongkun Zheng, Xiaolin Wang, Z Salman, T Prokscha, Katsuaki Suzuki, R Liu, Sean Li, E Morenzoni, Jiabao Yi
Australian Institute for Innovative Materials - Papers
Co doped ZnO films have been deposited by a laser-molecular beam epitaxy system. X-ray diffraction and UV spectra analysis show that Co effectively substitutes the Zn site. Transmission electron microscopy (TEM) and secondary ion mass spectroscopy analysis indicate that there are no clusters. Co dopants are uniformly distributed in ZnO film. Ferromagnetic ordering is observed in all samples deposited under an oxygen partial pressure, PO2=10-3, 10-5, and 10-7 torr, respectively. However, the magnetization of PO2=10-3 and 10-5 is very small at room temperature. At low temperature, the ferromagnetic ordering is enhanced. Muon spin relaxation (μSR) measurements confirm the ferromagnetism in …
Dispersion Of Ni2+Ions: Via Acetate Precursor In The Preparation Of Nanipo4 Nanoparticles: Effect Of Acetate Vs. Nitrate On The Capacitive Energy Storage Properties, Manickam Minakshi, David R. G Mitchell
Dispersion Of Ni2+Ions: Via Acetate Precursor In The Preparation Of Nanipo4 Nanoparticles: Effect Of Acetate Vs. Nitrate On The Capacitive Energy Storage Properties, Manickam Minakshi, David R. G Mitchell
Australian Institute for Innovative Materials - Papers
The influence of the precursors on the dispersion of Ni 2+ ions and the presence of several other functional groups was investigated in the preparation of sodium nickel phosphate (NaNiPO 4 ) cathode for a supercapacitor study. The dispersion of nickel phases, in the form of nanosheets, is influenced by the type of precursors used in the synthesis. XPS based spectroscopic information on the surface functional groups on NaNiPO 4 show differences between the precursors (i.e.) acetate- and nitrate-derived materials. The benefits of using acetate as an alternative to nitrate are explored by using the NaNiPO 4 nanoparticles as a …
Effect Of The Fabrication Technique On The Thermoelectric Performance Of Mg-Based Compounds-A Case Study Of N-Type Mg2ge, Joao Rafael Santos, Shi Xue Dou, Daryoosh Vashaee, Sima Aminorroaya-Yamini
Effect Of The Fabrication Technique On The Thermoelectric Performance Of Mg-Based Compounds-A Case Study Of N-Type Mg2ge, Joao Rafael Santos, Shi Xue Dou, Daryoosh Vashaee, Sima Aminorroaya-Yamini
Australian Institute for Innovative Materials - Papers
High performance, low cost, and low toxicity have been the main characteristics associated with magnesium-based thermoelectric materials. Nevertheless, the high volatility of magnesium creates challenges in the synthesis of these materials. In this work, n-type Mg2Ge is synthesized using a solid-state technique, fully characterized, and compared with Mg2Ge fabricated through different processes. We have found that Bi is an ineffective dopant in Mg2Ge and precipitates into Mg2Bi3. Regardless of the technique used, the loss of Mg by evaporation and formation of precipitates in Bi-doped samples resulted in a low charge carrier concentration and, consequently, a low power factor. The precipitates …
Semiconductor Solid-Solution Nanostructures: Synthesis, Property Tailoring, And Applications, Baodan Liu, Jing Li, Wenjin Yang, Xinglai Zhang, Xin Jiang, Yoshio Bando
Semiconductor Solid-Solution Nanostructures: Synthesis, Property Tailoring, And Applications, Baodan Liu, Jing Li, Wenjin Yang, Xinglai Zhang, Xin Jiang, Yoshio Bando
Australian Institute for Innovative Materials - Papers
The innovation of band-gap engineering in advanced materials caused by the alloying of different semiconductors into solid-solution nanostructures provides numerous opportunities and advantages in optoelectronic property tailoring. The semiconductor solid-solution nanostructures have multifarious emission wavelength, adjustability of absorption edge, tunable electrical resistivity, and cutting-edge photoredox capability, and these advantages can be rationalized by the assorted synthesis strategies such as, binary, ternary, and quaternary solid-solutions. In addition, the abundance of elements in groups IIB, IIIA, VA, VIA, and VIIA provides sufficient room to tailor-make the semiconductor solid-solution nanostructures with the desired properties. Recent progress of semiconductor solid-solution nanostructures including synthesis strategies, …
Phosphorus-Based Materials As The Anode For Sodium-Ion Batteries, Fuhua Yang, Hong Gao, Jun Chen, Zaiping Guo
Phosphorus-Based Materials As The Anode For Sodium-Ion Batteries, Fuhua Yang, Hong Gao, Jun Chen, Zaiping Guo
Australian Institute for Innovative Materials - Papers
No abstract provided.
Ag-Mg Antisite Defect Induced High Thermoelectric Performance Of Α-Mgagsb, Zhenzhen Feng, Jihua Zhang, Yuli Yan, Guangbiao Zhang, Chao Wang, Chengxiao Peng, Fengzhu Ren, Yuan Xu Wang, Zhenxiang Cheng
Ag-Mg Antisite Defect Induced High Thermoelectric Performance Of Α-Mgagsb, Zhenzhen Feng, Jihua Zhang, Yuli Yan, Guangbiao Zhang, Chao Wang, Chengxiao Peng, Fengzhu Ren, Yuan Xu Wang, Zhenxiang Cheng
Australian Institute for Innovative Materials - Papers
Engineering atomic-scale native point defects has become an attractive strategy to improve the performance of thermoelectric materials. Here, we theoretically predict that Ag-Mg antisite defects as shallow acceptors can be more stable than other intrinsic defects under Mg-poor-Ag/Sb-rich conditions. Under more Mg-rich conditions, Ag vacancy dominates the intrinsic defects. The p-type conduction behavior of experimentally synthesized ¿-MgAgSb mainly comes from Ag vacancies and Ag antisites (Ag on Mg sites), which act as shallow acceptors. Ag-Mg antisite defects significantly increase the thermoelectric performance of ¿-MgAgSb by increasing the number of band valleys near the Fermi level. For Li-doped ¿-MgAgSb, under more …
Effect Of Various Carbonization Temperatures On Zif-67 Derived Nanoporous Carbons, Yanna Guo, Jing Tang, Rahul R. Salunkhe, Zeid Abdullah Alothman, Md. Shahriar Al Hossain, Victor Malgras, Yusuke Yamauchi
Effect Of Various Carbonization Temperatures On Zif-67 Derived Nanoporous Carbons, Yanna Guo, Jing Tang, Rahul R. Salunkhe, Zeid Abdullah Alothman, Md. Shahriar Al Hossain, Victor Malgras, Yusuke Yamauchi
Australian Institute for Innovative Materials - Papers
Here we have prepared ZIF-67 derived nanoporous carbons (NPCs) under different carbonization temperatures ranging from 800 to 1000 °C, and investigated the effect of the temperature on the porous structure. Raman analysis confirms that the graphitic degree of the obtained samples increases as the applied carbonization temperature is increased. With the gradual increase of the graphitic degree, the surface area is decreased.
Origin Of Thermally Stable Ferroelectricity In A Porous Barium Titanate Thin Film Synthesized Through Block Copolymer Templating, Norihiro Suzuki, Minoru Osada, Md Motasim Billah, Zeid Abdullah Alothman, Yoshio Bando, Yusuke Yamauchi, Md. Shahriar Al Hossain
Origin Of Thermally Stable Ferroelectricity In A Porous Barium Titanate Thin Film Synthesized Through Block Copolymer Templating, Norihiro Suzuki, Minoru Osada, Md Motasim Billah, Zeid Abdullah Alothman, Yoshio Bando, Yusuke Yamauchi, Md. Shahriar Al Hossain
Australian Institute for Innovative Materials - Papers
A porous barium titanate (BaTiO 3 ) thin film was chemically synthesized using a surfactant-assisted sol-gel method in which micelles of amphipathic diblock copolymers served as structure-directing agents. In the Raman spectrum of the porous B aTiO 3 thin film, a peak corresponding to the ferroelectric tetragonal phase was observed at around 710 cm -1 , and it remained stable at much higher temperature than the Curie temperature of bulk single-crystal BaTiO 3 (∼130 °C). Measurements revealed that the ferroelectricity of the BaTiO 3 thin film has high thermal stability. By analyzing high-resolution transmission electron microscope images of the BaTiO …
A Comparison Study Of Decomposition Mechanisms Of Single-Cation And Double-Cations (Li, Al) Ammine Borohydrides, Xiaowei Chen, Renquan Li, Guanglin Xia, Hongsheng He, Weidong Zou, Xuebin Yu
A Comparison Study Of Decomposition Mechanisms Of Single-Cation And Double-Cations (Li, Al) Ammine Borohydrides, Xiaowei Chen, Renquan Li, Guanglin Xia, Hongsheng He, Weidong Zou, Xuebin Yu
Australian Institute for Innovative Materials - Papers
The decomposition mechanisms of [Li(NH 3 )][BH 4 ], [Al(NH 3 ) 6 ][BH 4 ] 3 and [Al(NH 3 ) 6 ][Li 2 (BH 4 ) 5 ] were investigated using Density functional theory (DFT) calculation. The calculated results show that [Li(NH 3 )][BH 4 ] has low NH 3 vacancy formation energy and diffusion barrier, therefore ammonia would easily release at relatively low temperature. Both [Al(NH 3 ) 6 ][BH 4 ] 3 and [Al(NH 3 ) 6 ][Li 2 (BH 4 ) 5 ] show relatively high NH 3 vacancy formation energies and diffusion barriers, which avoid …
Enhanced And One-Way Absorptance Of Linio2 Thin Films In One-Dimensional Photonic Crystals, C H. Yang, C Zhang, Zhimin Ao, Guoxiu Wang
Enhanced And One-Way Absorptance Of Linio2 Thin Films In One-Dimensional Photonic Crystals, C H. Yang, C Zhang, Zhimin Ao, Guoxiu Wang
Australian Institute for Innovative Materials - Papers
The refractive index of LiNiO 2 thin films is complex and exhibits both dielectric and metallic properties. With LiNiO 2 thin films coated on or inserted in photonic crystals (PCs), it is possible to enhance the absorptance in the designed (AB) n LiNiO 2 (BA) m PC structures. One-way absorption in the photonic bandgap of (AB) PCs has been observed via changing the optical transmitting direction. The positions, width, and strength of the absorption peaks depend on the thickness of the LiNiO 2 films, the incident angles, and the transverse electric/transverse magnetic modes. The photonic band structure can be employed …
Photosensitization Of Tio2 Nanofibers By Ag2s With The Synergistic Effect Of Excess Surface Ti3+ States For Enhanced Photocatalytic Activity Under Simulated Sunlight, Samina Ghafoor, Sadia Ata, Nasir Mahmood, Salman Noshear Arshad
Photosensitization Of Tio2 Nanofibers By Ag2s With The Synergistic Effect Of Excess Surface Ti3+ States For Enhanced Photocatalytic Activity Under Simulated Sunlight, Samina Ghafoor, Sadia Ata, Nasir Mahmood, Salman Noshear Arshad
Australian Institute for Innovative Materials - Papers
No abstract provided.
Capacity Enhancement Of The Quenched Li-Ni-Mn-Co Oxide High-Voltage Li-Ion Battery Positive Electrode, Anirudha Jena, Cho-Hsueh Lee, Wei Kong Pang, Vanessa K. Peterson, Neeraj Sharma, Chun-Chieh Wang, Yen-Fang Song, Chun-Che Lin, Ho Chang, Ru-Shi Liu
Capacity Enhancement Of The Quenched Li-Ni-Mn-Co Oxide High-Voltage Li-Ion Battery Positive Electrode, Anirudha Jena, Cho-Hsueh Lee, Wei Kong Pang, Vanessa K. Peterson, Neeraj Sharma, Chun-Chieh Wang, Yen-Fang Song, Chun-Che Lin, Ho Chang, Ru-Shi Liu
Australian Institute for Innovative Materials - Papers
Li-rich metal oxides, regarded as a high-voltage composite cathode, is currently one of the hottest positive electrode material for lithium-ion batteries, due to its high-capacity and high-energy performance. The crystallography, phase composition and morphology can be altered by synthesis parameters, which can influence drastically the capacity and cycling performance. In this work, we demonstrate Li1.207Ni0.127Mn0.54Co0.127O2, obtained by a co-precipitation method, exhibits super-high specific capacity up to 298 mAh g−1 and excellent capacity retention of ∼100% up to 50 cycles. Using neutron powder diffraction and transmission X-ray microscopy, we have found that the cooling-treatments applied after sintering during synthesis are crucially …
Photoexcited Terahertz Conductivity Dynamics Of Graphene Tuned By Oxygen-Adsorption, Zeyu Zhang, Tie Lin, Xiao Xing, Xian Lin, Xiangjian Meng, Zhenxiang Cheng, Zuanming Jin, Guohong Ma
Photoexcited Terahertz Conductivity Dynamics Of Graphene Tuned By Oxygen-Adsorption, Zeyu Zhang, Tie Lin, Xiao Xing, Xian Lin, Xiangjian Meng, Zhenxiang Cheng, Zuanming Jin, Guohong Ma
Australian Institute for Innovative Materials - Papers
By using optical pump-terahertz (THz) probe spectroscopy, the photoexcited terahertz conductivity dynamics of chemical vapor deposition grown graphene is investigated in different atmospheric environments. It is shown that the Fermi energy of doped graphene is engineered by oxygen adsorption and desorption, which is probed by transient THz conductivity measurement. We show that the ultrafast energy relaxation processes depend on Fermi energy (changed by environmental gas) and the density of excited carriers (changed by photo-excitation fluence). The rise process of the negative conductivity dynamics becomes less efficient upon decreasing the Fermi energy and/or increasing the pump fluence. All findings show that …