检索结果-南通市图书馆

atomically thin optical lenses and gratings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 562-569页

作者： Jiong Yang Zhu Wang Fan Wang Renjing Xu Jin Tao Shuang Zhang Qinghua Qin Barry Luther-Davies Chennupati Jagadish Zongfu Yu Yuerui Lu Research School of Engineering College of Engineering and Computer Sciencethe Australian National UniversityCanberraACT 2601Australia Department of Electrical and Computer Engineering University of WisconsinMadisonWI 53706USA Department of Electronic Materials Engineering Research School of Physics and Engineeringthe Australian National UniversityCanberraACT 2601Australia CUDOS Laser Physics CentreResearch School of Physics and Engineeringthe Australian National UniversityCanberraACT 2601Australia

Two-dimensional(2D)materials have emerged as promising candidates for miniaturized optoelectronic devices due to their strong inelastic interactions with *** the other hand,a miniaturized optical system also requires strong elastic light–matter interactions to control the flow of *** we report that a single-layer molybdenum disulfide(MoS2)has a giant optical path length(OPL),around one order of magnitude larger than that from a single-layer of *** such giant OPL to engineer the phase front of optical beams we have demonstrated,to the best of our knowledge,the world’s thinnest optical lens consisting of a few layers of MoS2 less than 6.3 nm *** taking advantage of the giant elastic scattering efficiency in ultra-thin high-index 2D materials,we also demonstrated high-efficiency gratings based on a single-or few-layers of *** capability of manipulating the flow of light in 2D materials opens an exciting avenue towards unprecedented miniaturization of optical components and the integration of advanced optical *** importantly,the unique and large tunability of the refractive index by electric field in layered MoS2 will enable various applications in electrically tunable atomically thin optical components,such as micro-lenses with electrically tunable focal lengths,electrical tunable phase shifters with ultra-high accuracy,which cannot be realized by conventional bulk solids.

关键词： atomically thin grating micro-lens MoS2 two-dimensional

Cation-vacancy induced Li+ intercalation pseudocapacitance at atomically thin heterointerface for high capacity and high power lithium-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第11期30卷 281-288,I0006页

作者： Ding Yuan David Adekoya Yuhai Dou Yuhui Tian Hao Chen Zhenzhen Wu Jiadong Qin Linping Yu Jian Zhang Xianhu Liu Shi Xue Dou Shanqing Zhang Centre for Clean Environment and Energy School of Environment and ScienceGold Coast CampusGriffith UniversityGold Coast 4222Australia Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation Changsha University of Science and TechnologyChangsha 410114HunanChina National Engineering Research Centre for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002HenanChina Institute for Superconducting and Electronic Materials University of Wollongong AustraliaWollongong 2500Australia

It is challenging to create cation vacancies in electrode materials for enhancing the performance of rechargeable lithium ion batteries (LIBs). Herein, we utilized a strong alkaline etching method to successfully create Co vacancies at the interface of atomically thin Co_(3−x)O_(4)/graphene@CNT heterostructure for high-energy/power lithium storage. The creation of Co-vacancies in the sample was confirmed by high-resolution scanning transmission electron microscope (HRSTEM), X-ray photoelectron spectroscopy (XPS) and electron energy loss near-edge structures (ELNES). The obtained Co_(3−x)O_(4)/graphene@CNT delivers an ultra-high capacity of 1688.2 mAh g^(−1) at 0.2 C, excellent rate capability of 83.7% capacity retention at 1 C, and an ultralong life up to 1500 cycles with a reversible capacity of 1066.3 mAh g^(−1). Reaction kinetic study suggests a significant contribution from pseudocapacitive storage induced by the Co-vacancies at the Co_(3−x)O_(4)/graphene@CNT interface. Density functional theory confirms that the Co-vacancies could dramatically enhance the Li adsorption and provide an additional pathway with a lower energy barrier for Li diffusion, which results in an intercalation pseudocapacitive behavior and high-capacity/rate energy storage.

关键词： Cation vacancy atomically thin Interface Pseudocapacitance Lithium-ion batteries

Band gap engineering of atomically thin two-dimensional semiconductors

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第3期26卷 48-58页

作者：葛翠环李洪来朱小莉潘安练 Key Laboratory for Micro-Nano Physics and Technology of Hunan Province Key Laboratory for Micro/Nano Optoeleetronic Devices of Ministry of Education State Key Laboratory of Chemo/Biosensing and Chemometrics School of Physics and Electronics Hunan University Changsha 410082 China

atomically thin two-dimensional （2D） layered materials have potential applications in nanoelectronics, nanophoton- ics, and integrated optoelectronics. Band gap engineering of these 2D semiconductors is critical for their broad applications in high-performance integrated devices, such as broad-band photodetectors, multi-color light emitting diodes （LEDs）, and high-efficiency photovoltaic devices. In this review, we will summarize the recent progress on the controlled growth of composition modulated atomically thin 2D semiconductor alloys with band gaps tuned in a wide range, as well as their induced applications in broadly tunable optoelectronic components. The band gap engineered 2D semiconductors could open up an exciting opportunity for probing their fundamental physical properties in 2D systems and may find diverse applications in functional electronic/optoelectronic devices.

关键词： 2D semiconductors band gap engineering alloys atomically thin

A highly efficient atomically thin curved Pd Ir bimetallene electrocatalyst

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

National Science Review 2021年第9期8卷 100-110页

作者： Fan Lv Bolong Huang Jianrui Feng Weiyu Zhang Kai Wang Na Li Jinhui Zhou Peng Zhou Wenxiu Yang Yaping Du Dong Su Shaojun Guo School of Materials Science and Engineering Peking University Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University Frontier Institute of Science and Technology jointly with College of Science Xi'an Jiaotong University Center for Functional Nanomaterials Brookhaven National Laboratory School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University College of Engineering Peking University

The multi-metallene with an ultrahigh surface area has great potential in precise tuning of surface heterogeneous d-electronic correlation by surface strain effect for the distinctive surface electronic structure, which is a brand new class of promising 2 D electrocatalyst for sustainable energy device application. However, achieving such an atomically thin multi-metallene still presents a great ***, we present a new synthetic method for an atomic-level palladium-iridium(Pd Ir) bimetallene with an average thickness of only～1.0 nm for achieving superior catalysis in the hydrogen evolution reaction(HER) and the formic acid oxidation reaction(FAOR). The curved Pd Ir bimetallene presents a top-ranked high electrochemical active area of 127.5 ± 10.8 m~2 g Pd+Ir-1in the reported noble alloy materials, and exhibits a very low overpotential, ultrahigh activity and improved stability for HER and FAOR. DFT calculation reveals that the Pd Ir bimetallene herein has a unique lattice tangential strain, which can induce surface distortion while concurrently creating a variety of concave-convex featured micro-active regions formed by variously coordinated Pd sites agglomeration. Such a strong strain effect correlates the abnormal on-site active 4 d10-t2g-orbital Coulomb correlation potential and directly elevates orbital-electronegativity exposure within these active regions, resulting in a preeminent barrier-free energetic path for significant enhancement of FAOR and HER catalytic performance.

关键词： strain metallene PdIr alloy atomically thin electrocatalyst

Recent progress and challenges on two-dimensional material photodetectors from the perspective of advanced characterization technologies

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第6期14卷 1840-1862页

作者： Fang Zhong Hao Wang Zhen Wang Yang Wang Ting He Peisong Wu Meng Peng Hailu Wang Tengfei Xu Fang Wang Peng Wang Jinshui Miao Weida Hu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China University of Chinese Academy of Sciences Beijing100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China

atomically thin two-dimensional(2D)materials exhibit enormous potential in photodetectors because of novel and extraordinary properties,such as passivated surfaces,tunable bandgaps,and high ***-performance photodetectors based on 2D materials have been fabricated for broadband,position,polarization-sensitive detection,and large-area array ***,the current performance of 2D material photodetectors is not outstanding enough,including response speed,detectivity,and so *** way to further promote the development of 2D material photodetectors and their corresponding practical applications is still a tremendous *** this article,these issues of 2D material photodetectors are analyzed and expected to be solved by combining micro-nano characterization *** inherent physical properties of 2D materials and photodetectors can be accurately characterized by Raman spectroscopy,transmission electron microscopy(TEM),and scattering scanning near-field optical microscope(s-SNOM).In particular,the precise probe of lattice defects,doping concentration,and near-field light absorption characteristics can promote the researches of low-noise and high-responsivity *** photocurrent microscope(SPCM)can show the overall spatial distribution of photocurrent and analyze the mechanism of ***(PL)spectroscopy and Kelvin probe force microscope(KPFM)can characterize the material bandgap,work function distribution and interlayer coupling characteristics,making it possible to design high-performance photodetectors through energy band *** advanced characterization techniques cover the entire process from material growth,to device preparation,and to performance analysis,and systematically reveal the development status of 2D material ***,the prospects and challenges are discussed to promote the application of 2D material photodetectors.

关键词： characterization technologies photodetectors two-dimensional materials atomically thin

atomically phase-matched second-harmonic generation in a 2D crystal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 542-547页

作者： Mervin Zhao Ziliang Ye Ryuji Suzuki Yu Ye Hanyu Zhu Jun Xiao Yuan Wang Yoshihiro Iwasa Xiang Zhang Department of Mechanical Engineering NSF Nanoscale Science and Engineering CenterUniversity of CaliforniaBerkeleyCA 94720USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Quantum-Phase Electronics Center(QPEC)and Department of Applied Physics The University of TokyoTokyo 113-8656Japan RIKEN Center for Emergent Matter Science(CEMS) Wako 351-0198Japan Department of Physics King Abdulaziz UniversityJeddah 21589Saudi Arabia

Second-harmonic generation(SHG)has found extensive applications from hand-held laser pointers to spectroscopic and microscopic ***,some cleavable van der Waals(vdW)crystals have shown SHG arising from a single atomic layer,where the SH light elucidated important information such as the grain boundaries and electronic structure in these ultra-thin ***,despite the inversion asymmetry of the single layer,the typical crystal stacking restores inversion symmetry for even numbers of layers leading to an oscillatory SH response,drastically reducing the applicability of vdW crystals such as molybdenum disulfide(MoS_(2)).Here,we probe the SHG generated from the noncentrosymmetric 3R crystal phase of MoS_(2).We experimentally observed quadratic dependence of second-harmonic intensity on layer number as a result of atomically phase-matched nonlinear dipoles in layers of the 3R crystal that constructively *** studying the layer evolution of the A and B excitonic transitions in 3R-MoS_(2) using SHG spectroscopy,we also found distinct electronic structure differences arising from the crystal structure and the dramatic effect of symmetry and layer stacking on the nonlinear properties of these atomic *** constructive nature of the SHG in this 2D crystal provides a platform to reliably develop atomically flat and controllably thin nonlinear media.

关键词： atomically thin phase-matching second-harmonic generation 3R-MoS_(2)