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Self-assembled V2O5 interconnected microspheres produced in a fish-water electrolyte medium as a high- performance lithium-ion-battery cathode

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Nano Research 2015年第11期8卷 3591-3603页

作者： Md Mokhlesur Rahman Abu Z. Sadek Irin Sultana Mateti Srikanth Xiujuan J. Dai Matthew R. Field Dougal G. McCulloch Sri Balaji Ponraj Ying Chen Institute for Frontier Materials Deakin University Waurn Ponds VIC 3216 Australia melbourne centre for nanofabrication 151 Wellington Rd Clayton VIC 3168 Australia School of Applied Sciences Applied Physics RMIT University Melbourne VIC 3001 Australia

Interconnected microspheres of V2Os composed of ultra-long nanobelts are synthesized in an environmental friendly way by adopting a conventional anodization process combined with annealing. The synthesis process is simple and low-cost because it does not require any additional chemicals or reagents. Commercial fish-water is used as an electrolyte medium to anodize vanadium foil for the first time. Electron microscopy investigation reveals that each belt consists of numerous nanofibers with free space between them. Therefore, this novel nanostructure demonstrates many outstanding features during electrochemical operation. This structure prevents self-aggregation of active materials and fully utilizes the advantage of active materials by maintaining a large effective contact area between active materials, conductive additives, and electrolyte, which is a key challenge for most nanomaterials. The electrodes exhibit promising electrochemical performance with a stable discharge capacity of 227 mAh·g^-1 at 1C after 200 cycles. The rate capability of the electrode is outstanding, and the obtained capacity is as high as 278 at 0.5C, 259 at 1C, 240 at 2C, 206 at 5C, and 166 mAh·g^-1 at 10C. Overall this novel structure could be one of the most favorable nanostructures of vanadium oxide-based cathodes for Li-ion batteries.

关键词： self-assembly interconnected microspheres fish-water electrolyte V2O5 cathode lithium-ion batteries

Optical Emission Analysis of Molecular Nitrogen by Using a Self-Resonating Dielectric Barrier Plasma Reactor

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Chinese Physics Letters 2012年第5期29卷 177-180页

作者： A.M.A.Amry V.J.Law I.W.Boyd Physics Department Faculty of ScienceTaif UniversityTaif 21974Kingdom of Saudi Arabia Department of Electronic and Electrical Engineering University College London WC1E 7JEUnited Kingdom melbourne centre for nanofabrication 151 Wellington RoadClaytonVic 3168Australia

We present a spectroscopic investigation of molecular nitrogen using a self-resonating co-axial dielectric barrier plasma *** properties of the nitrogen plasma generated were recorded as functions of radio frequency (27.12MHz),power (20-50 W) and gas pressure (0.1 60mbar). The intensity distribution of the transitional structure of the electronic bands C^(3)∏_(u) → B^(3)∏_(g),B^(2)Σ_(u)^(+) → X^(2)Σ_(g)^(+) and D^(2) ∏_(g) → A^(2)∏_(7u) was measured as a fimction of gas *** energy efficiency (total emitted intensity from the plasma It divided by total electric power to the discharge P),as high as 14% can be obtained at a dissipated electrical power level of 20 W and a pressure of 10mbar.

关键词： bands dielectric spectroscopic

Plasmonic nano-printing: large-area nanoscale energy deposition for efficient surface texturing

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Light(Science & Applications) 2017年第1期6卷 335-341页

作者： Lei Wang Qi-Dai Chen Xiao-Wen Cao Ričardas Buividas Xuewen Wang Saulius Juodkazis Hong-Bo Sun State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin University2699 Qianjin StreetChangchun 130012China centre for Micro-Photonics Faculty of ScienceEngineering and TechnologySwinburne University of TechnologyHawthornVIC 3122Australia melbourne centre for nanofabrication ANFF151 Wellington RoadClaytonVIC 3168Australia

The lossy nature of plasmonic wave due to absorption is shown to become an advantage for scaling-up a large area surface nanotexturing of transparent dielectrics and semiconductors by a self-organized sub-wavelength energy deposition leading to an ablation pattern—ripples—using this plasmonic *** nanoscale modifications are delivered by surface plasmon polariton(SPP)using:(i)fast scan and(ii)cylindrical focusing of femtosecond laser pulses for a high patterning *** mechanism of ripple formation on ZnS dielectric is experimentally proven to occur via surface wave at the substrate–plasma *** line focusing increase the ordering quality of ripples and facilitates fabrication over wafer-sized areas within a practical time *** using SPP is expected to open new applications in photo-catalysis,tribology,and solar light harvesting via localized energy deposition rather scattering used in photonic and sensing applications based on re-scattering of SPP modes into far-field modes.

关键词： deep-subwavelength structures laser induced periodic structures large-area fabrication plasmonic subwavelength structures

Fresnel incoherent correlation holography with single camera shot

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Opto-Electronic Advances 2020年第8期3卷 12-22页

作者： Anand Vijayakumar Tomas Katkus Stefan Lundgaard Denver P.Linklater Elena P.Ivanova Soon Hock Ng Saulius Juodkazis Optical Sciences centre and ARC Training centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthorn 3122Australia Department of Physics Royal Melbourne Institute of TechnologyGPO Box 2476Melbourne 3001Australia melbourne centre for nanofabrication Australian National Fabrication Facility151 Wellington RoadClaytonVIC 3168Australia Tokyo Tech World Research Hub Initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Fresnel incoherent correlation holography(FINCH)is a self-interference based super-resolution three-dimensional imaging *** in inline configuration requires an active phase modulator to record at least three phase-shifted camera shots to reconstruct objects without twin image and bias *** this study,FINCH is realized using a randomly multiplexed bifocal binary diffractive Fresnel zone lenses fabricated using electron beam *** object space is calibrated by axially scanning a point object along the optical axis and recording the corresponding point spread holograms(PSHs).An object is mounted within the calibrated object space,and the object hologram was recorded under identical experimental conditions used for recording the *** image of the object at different depths was reconstructed by a cross-correlation between the object hologram and the *** potential including bio-medical optics is discussed.

关键词： imaging holography correlation three-dimensional imaging diffractive optics

On-chip plasmonic spin-Hall nanograting for simultaneously detecting phase and polarization singularities

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Light(Science & Applications) 2020年第1期9卷 1095-1103页

作者： Fu Feng Guangyuan Si Changjun Min Xiaocong Yuan Michael Somekh Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China melbourne centre for nanofabrication Victorian Node of the Australian National Fabrication FacilityClaytonVICAustralia Faculty of Engineering University of NottinghamNottingham NG72RDUK

Phase and polarization singularities are important degrees of freedom for electromagnetic field *** these singularities is essential for modern optics,but it is still a challenge,especially in integrated optical *** this paper,we propose an on-chip plasmonic spin-Hall nanograting structure that simultaneously detects both the polarization and phase singularities of the incident cylindrical vortex vector beam(CVVB).The nanograting is symmetry-breaking with different periods for the upper and lower parts,which enables the unidirectional excitation of the surface plasmon polariton depending on the topological charge of the incident optical vortex ***,spin-Hall meta-slits are integrated onto the grating so that the structure has a chiral response for polarization *** demonstrate theoretically and experimentally that the designed structure fully discriminates both the topological charges and polarization states of the incident beam *** proposed structure has great potential in compact integrated photonic circuits.

关键词： polarization simultaneous phase

Recent advances in the rational design of electrocatalysts towards the oxygen reduction reaction

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Chinese Journal of Catalysis 2017年第6期38卷 951-969页

作者： Jianfei Kong Wenlong Cheng Yancheng Vocational Institute of Health Sciences Yancheng 224000 Jiangsu China Department of Chemical Engineering Faculty of Engineering Monash University Clayton VIC 3800 Australia melbourne centre for nanofabrication Clayton VIC 3168 Australia

The quest for low‐cost yet efficient non‐Pt electrocatalysts for the oxygen reduction reaction(ORR)has become one of the main focuses of research in the field of catalysis,which has implications for the development of the next generation of greener fuel ***,we comprehensively describe the'big picture'of recent advances made in the rational design of ORR electrocatalysts,including molecule‐based,metal‐oxide‐based,metal‐nanomaterial‐based and two‐dimensional *** metals can fabricate molecular electrocatalysts with N4‐macrocycles such as porphyrin‐class compounds and the so‐formed M-N-C active centre plays a crucial role in determining the catalytic performances towards the ***‐IV and‐V Transition metal oxides represent another class of promising alternative of Pt‐based catalysts for the ORR which catalytic activity largely depends on the surface structure and the introduction of surface *** advances in synthesis of metallic nanoparticles(NPs)allow for precise control over particle sizes and shapes and the crystalline facets exposed to enhance the ORR performance of ***‐dimensional materials such as functionalized grapheme or MoS2are emerging as novel electrocatalysts for the *** review covers various aspects towards the design of future ORR electrocatalysts,including the catalytic performance,stability,durability and *** novel electrocatalysts even surpass commercial Pt/C systems,demonstrating their potential to be alternatives in industrial *** the encouraging progress,challenges,which are also described,remain to be overcome before the real‐world application of novel ORR electrocatalysts.

关键词： Oxygen reduction reaction Electrocatalyst Nanomaterial Molecular electrocatalyt Two‐dimensional material

Holographic laser fabrication of 3D artificial compound μ-eyes

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Light(Advanced Manufacturing) 2023年第4期4卷 1-9页

作者： Lei Wang Wei Gong Xiao-Wen Cao Yan-Hao Yu Saulius Juodkazis Qi-Dai Chen Jilin University State Key Laboratory of Integrated OptoelectronicsCollege of Electronic Science and EngineeringChangchun130012China Optical Sciences centre and ARC Training centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthornVictoria 3122Australia melbourne centre for nanofabrication 151 Wellington RoadClayton VIC3168Australia

The demand for fast optical image acquisition without movable optical elements(e.g.,for self-driving car technology)can be met using bioinspired 3D compound eyes.3D laser processing strategies enable designable 3D structuring but suffer from low fabrication efficiency,which significantly limits their applications in producing complex 3D optical ***,we demonstrate a versatile yet simple wet-etching-assisted holographic laser fabrication method for the development of 3D compound *** compoundμ-eyes can be readily fabricated by programming a 3D spot array for the parallel ablation of a curved fused silica surface,followed by controllable etching in a hydrofluoric(HF)acid solution.A 3D-concave-lens array made on a curved surface over an area of 100μm cross-section with each lenslet of 10μm radius was fabricated with high fidelity and excellent imaging/focusing *** resultant 3D-concave-lens can serve as a hard template for the mass production of soft compound eyes through soft ***,using a generative adversarial network(GAN)-based deep learning algorithm,image restoration was conducted for each lenslet,which retained a large field of view and significantly improved image *** method provides a simple solution to the requirements of compoundμ-eyes required by Industry 4.0.

关键词： Holographic laser fabrication Wet etching compound eye Micro-optics Fast imaging Imaging restoration

Matryoshka-caged gold nanorods： Synthesis, plasmonic properties, and catalytic activity

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Nano Research 2016年第2期9卷 415-423页

作者： Wei Xiong Debabrata Sikdar Lim Wei Yap Pengzhen Guo Malin Premaratne Xinyong Li Wenlong Cheng Department of Chemical Engineering Monash University Clayton VIC 3800 Australia the melbourne centre for nanofabrication 151 Wellington Road Clayton VIC 3168 Australia Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemicals School of Environmental Sciences and Technology Dalian University of Technology Dalian 116024 China Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC 3800 Australia

Matryoshka-caged gold nanorods （mCGNRs） were successfully synthesized by alternating between a seed-mediated silver-coating method and galvanic replacement reactions （GRRs）. As the number of matryoshka layers of the mCGNRs increased, the plasmon resonance peak broadened and was red-shifted, and the catalytic activity towards the reduction of 4-nitrophenol （4-NTP） increased. When mCGNRs with 6 layers were used as nanocatalysts in the reduction of 4-nitrophenol, the reaction rate coefficient was 5.2- and 3.7-times higher than that of the gold-nanorod- and caged-gold-nanorod-catalyzed reductions of 4-nitrophenol, respectively. In addition, the surface-plasmon-resonance-based absorption of light enhanced the catalytic performance of the mCGNRs. With the support of a polyurethane foam, the mCGNRs synthesized in this study can be applied as recydable heterogeneous catalysts for the reduction of 4-nitrophenol.

关键词： matryoshka-caged gold nanorods galvanic replacement reaction 4-nitrophenol catalysis surface plasmon resonance

Light Enhancement in Surface-Enhanced Raman Scattering at Oblique Incidence

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Photonic Sensors 2012年第3期2卷 283-288页

作者： Sasani JAYAWARDHANA Lorenzo ROSA Ricardas BUIVIDAS Paul R. STODDART Saulius JUODKAZIS centre for Atom Optics and Ultrafast Spectroscopy Faculty of Engineering and Industrial Sciences SwinburneUniversity of Technology Hawthorn VIC 3122 Australia centre for Micro-Photonics Faculty of Engineering and Industrial Sciences Swinburne University of TechnologyHawthorn VIC 3122 Australia melbourne centre for nanofabrication 151 Wellington Road Clayton VIC 3168 Australia

Surface enhanced Raman scattering （SERS） measurements have been carried out at different focusing conditions using objective lenses of different numerical apertures. The experimentally observed dependence of SERS intensity of thiophenol-coated Ag nano-islands shows a close-to-linear scaling with the collection aperture. The linear relationship breaks down for large numerical apertures, which suggests that the scattering is anisotropic. Numerical simulations of realistically shaped Ag nano-islands were carried out, and the spatial distribution of hot-spots has been revealed at different heights near the nano-islands. Local field enhancements of up to 100 times were estimated. The simulation also suggests an explanation for the anisotropy in the scattering observed for larger numerical aperture objectives. This appears to be due to a reduction in the local field enhancement as the electric field vector component in the plane of the shallow metal islands reduces at larger angles of incidence.

关键词： Surface-enhanced Raman scattering metal island films finite difference time domain