检索结果-内蒙古大学图书馆

Toward Complete Transformation of Sodium Polysulfides by Regulating the Second-Shell Coordinating Environment of Atomically Dispersed Fe

引用

Angewandte Chemie 2023年第26期135卷

作者： Ruilin Bai Qiaosong Lin Xinyu Li Fangxin Ling Huijuan Wang Sha Tan Lingxiang Hu Mingze Ma Prof. Xiaojun Wu Yu Shao Xianhong Rui Prof. Enyuan Hu Dr. Yu Yao Prof. Yan Yu Hefei National Research Center for Physical Sciences at the Microscale Department of Materials Science and Engineering CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei Anhui 230026 China Contribution: Conceptualization (lead) Writing - original draft (lead) State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China University of Chinese Academy of Sciences Beijing 100049 China Contribution: Data curation (lead) Contribution: Formal analysis (equal) Contribution: Investigation (lead) Experimental Center of Engineering and Material Science University of Science and Technology of China Hefei 230026 China Contribution: Methodology (equal) Chemistry Division Brookhaven National Laboratory Upton NY USA Contribution: Resources (equal) Department of Electrical Engineering and Computer Science Institut Polytechnique de Paris 91120 Palaiseau Île-de-France France Contribution: Software (equal) Contribution: Data curation (equal) Jiujiang DeFu Technology Co. Ltd. Jiujiang Jiangxi 332000 (P. R. China School of Materials and Energy Guangdong University of Technology Guangzhou 510006 China Contribution: Validation (lead) Contribution: Methodology (lead) Contribution: Writing - review & editing (lead) National Synchrotron Radiation Laboratory Hefei Anhui 230026 China Contribution: Project administration (lead) Writing - review & editing (lead)

Room temperature sodium-sulfur (RT Na-S) batteries are highly competitive as potential energy storage devices. Nevertheless, their actually achieved reversible capacities are far below the theoretical value due to incomplete transformation of polysulfides. Herein, atomically dispersed Fe-N/S active center by regulating the second-shell coordinating environment of Fe single atom is proposed. The Fe−N 4 S 2 coordination structure with enhanced local electronic concentration around the Fermi level is revealed via synchrotron radiation X-ray absorption spectroscopy (XAS) and theoretical calculations, which can not only significantly promote the transformation kinetics of polysulfides, but induce uniform Na deposition for dendrite-free Na anode. As a result, the obtained S cathode delivers a high initial reversible capacity of 1590 mAh g −1 , nearly the theoretical value. This work opens up a new avenue to facilitate the complete transformation of polysulfides for RT Na-S batteries.

关键词： Catalysis Coordinating Environment Fe Single Atom RT Na-S Batteries Transformation Kinetics

来源：评论

学校读者我要写书评

暂无评论

Tailoring the thermo-optic coefficient in silica optical fibers

Tailoring the thermo-optic coefficient in silica optical fib...

引用

Optical Fiber Sensors, OFS 2018

作者： Dragic, P. Cavillon, M. Kucera, C. Parsons, J. Hawkins, T. Ballato, J. Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61822 United States Center for Optical Materials Science and Engineering Technologies Clemson University ClemsonSC29625 United States

Compositional design of the thermo-optic coefficient of optical fiber is discussed. The influences of P2O5, B2O3, SrO, and F are presented. Phosphorus borosilicate compositions appear to be the most attractive for rea... 详细信息

ISBN: (纸本)9781943580507

关键词： Silica

来源：评论

学校读者我要写书评

暂无评论

Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

引用

Physical Review B 2020年第12期102卷 125145-125145页

作者： T. S. Suraj Ganesh Ji Omar Hariom Jani M. M. Juvaid Sonu Hooda Anindita Chaudhuri Andrivo Rusydi K. Sethupathi Thirumalai Venkatesan Ariando Ariando M. S. Ramachandra Rao Department of Physics Nano Functional Materials Technology Center Material Science Research Center Indian Institute of Technology Madras Chennai 600036 India Low Temperature Physics Lab Department of Physics Indian Institute of Technology Madras Chennai 600036 India Department of Physics National University of Singapore Singapore 117542 Singapore NUSNNI-NanoCore National University of Singapore Singapore 117411 Singapore National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS) University Hall 21 Lower Kent Ridge Road Singapore 119077 Singapore Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a platform for engineering magnetism and spin-orbit coupling at the LaMnO3/SrIrO3 (3d−5d) oxide interface by tuning the LaMnO3 growth conditions, which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report a tunable and enhanced interface-induced Rashba spin-orbit coupling where the spin relaxation mechanism varies with magnetic behavior of the underlying LaMnO3 layer. The x-ray spectroscopy measurements reveal the quantitative valence states of Mn and their impact on charge transfer. Our angle-dependent magnetoresistance measurements also reflects the signature of magnetic proximity effect in SrIrO3 and can be tuned with the magnetic nature of LaMnO3 in a LaMnO3/SrIrO3 bilayer. Our work demonstrates a route to engineer the interface-induced Rashba spin-orbit coupling and magnetic proximity effect at the 3d−5d oxide interface for spintronics applications.

关键词： Magnetoresistance Rashba coupling Spin relaxation Spin-orbit coupling Interfaces Strongly correlated systems

来源：评论

学校读者我要写书评

暂无评论

Epitaxial SrTiO3 film on silicon with narrow rocking curve despite huge defect density

引用

Physical Review materials 2019年第7期3卷 073403-073403页

作者： Z. Wang B. H. Goodge D. J. Baek M. J. Zachman X. Huang X. Bai C. M. Brooks H. Paik A. B. Mei J. D. Brock J-P. Maria L. F. Kourkoutis D. G. Schlom School of Applied and Engineering Physics Cornell University Ithaca New York 14853 USA Department of Materials Science and Engineering Cornell University Ithaca New York 14853 USA Kavli Institute at Cornell for Nanoscale Science Ithaca New York 14853 USA School of Electrical and Computer Engineering Cornell University Ithaca New York 14853 USA Cornell High Energy Synchrotron Source Cornell University Ithaca New York 14853 USA Platform for the Accelerated Realization Analysis and Discovery of Interface Materials (PARADIM) Cornell University Ithaca New York 14853 USA Penn State University Department of Materials Science and Engineering University Park Pennsylvania 16802 USA

The structural perfection and defect microstructure of epitaxial (001) SrTiO3 films grown on (001) Si was assessed by a combination of x-ray diffraction and scanning transmission electron microscopy. Conditions were identified that yield 002 SrTiO3 rocking curves with full width at half-maximum below 0.03° for films ranging from 2 to 300 nm thick, but this is because this particular peak is insensitive to the ∼8×1011cm–2 density of threading dislocations with pure edge character and extended defects containing dislocations and out-of-phase boundaries. Our results show that one narrow rocking curve peak is insufficient to characterize the structural perfection of epitaxial films.

关键词： Crystal growth High-resolution transmission electron microscopy Molecular beam epitaxy Reflection high-energy electron diffraction X-ray diffraction

来源：评论

学校读者我要写书评

暂无评论

Low nonlinearity fibers

Low nonlinearity fibers

引用

Specialty Optical Fibers, SOF 2018

作者： Dragic, P. Cavillon, M. Kucera, C. Yu, N. Hawkins, T. Ballato, J. Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL61822 United States Center for Optical Materials Science and Engineering Technologies Clemson University ClemsonSC29625 United States

Through judicious selection of glass composition, optical fibers with reduced susceptibility to deleterious light-matter interactions are achieved. The current state and future development of low nonlinearity fiber us... 详细信息

ISBN: (纸本)9781943580439

关键词： Glass

来源：评论

学校读者我要写书评

暂无评论

A Multifunctional Molecular Modifier Enabling Efficient Large-Area Perovskite Light-Emitting Diodes

SSRN

引用

SSRN 2020年

作者： Wang, Haoran Gong, Xiwen Zhao, Dewei Zhao, Yong-Biao Wang, Sheng Zhang, Jianfeng Kong, Lingmei Wei, Bin Quintero-Bermudez, Rafael Voznyy, Oleksandr Shang, Yuequn Ning, Zhijun Yan, Yanfa Sargent, Edward H. Yang, Xuyong Shanghai University 149 Yanchang Road Shanghai 200072 China The Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 35 St. George Street TorontoONM5S 1A4 Canada Institute of Solar Energy Materials and Devices College of Materials Science and Engineering Sichuan University 24 South Section 1 Yihuan Road Chengdu610065 China Department of Physics and Astronomy Wright Center for Photovoltaics Innovation and Commercialization The University of Toledo OH Toledo43606 United States School of Physical Science and Technology ShanghaiTech University 393 Middle Huaxia Road Shanghai Pudong201210 China

With rapid progress in perovskite light-emitting diodes (PeLEDs), the electroluminescence performance of large-area perovskite devices is increasingly important. We investigate why large-area performance lags behind that achieved in laboratory-scale devices, and found that defects in perovskite films – emerging from thermal convection during solvent evaporation and electronic traps formed during perovskite crystallization – are chief causes. Here we report a molecular modification strategy that simultaneously eliminates pinholes in perovskite layers by controlling the dynamics of film formation, and passivates the defects in perovskites by incorporating Br species, thereby preventing shorts and non-radiative recombination. The molecular modifier 1,3,5-tris (bromomethyl) benzene (TBB) also modulates the electronic structure of injection/transport materials to achieve improved charge injection and balanced charge transport. As a result, we demonstrate a 20 mm × 20 mm green perovskite nanocrystal LED that achieves an external quantum efficiency (EQE) of over 16%, the record efficiency for large-area PeLEDs. Our work opens a route to scaling perovskite LEDs. © 2020, The Authors. All rights reserved.

关键词： Perovskite

来源：评论

学校读者我要写书评

暂无评论

Quasielectrostatic Wave Propagation Beyond the Delay-Bandwidth Limit in Switched Networks

引用

Physical Review X 2019年第3期9卷 031015-031015页

作者： Mykhailo Tymchenko Dimitrios Sounas Aravind Nagulu Harish Krishnaswamy Andrea Alù Department of Electrical and Computer Engineering The University of Texas at Austin 1 University Station C0803 Austin Texas 78712 USA Department of Electrical and Computer Engineering Wayne State University Detroit Michigan 48202 USA Department of Electrical Engineering Columbia University 1300 South West Mudd 500 West 120th Street New York New York 10027 USA Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Physics Program Graduate Center City University of New York New York New York 10026 USA Department of Electrical Engineering City College of New York New York New York 10031 USA

The delay-bandwidth limit implies a stringent trade-off between the time delay, bandwidth, and propagation distance of an electromagnetic signal. Here, we show that temporal modulation can overcome this constraint, enabling extremely broadband wave propagation with close-to-zero group velocity dispersion in switched multipath electronic networks. Contrary to time-invariant waveguides, in which wave propagation implies a delicate balance between electric and magnetic stored energies, in such modulated networks the stored energy is largely electrostatic in nature. We show that in this case the phase and group velocities become independent of the properties of their constituent elements, and they are controlled only by the modulation scheme. Based on these findings, we provide practical designs of deeply subwavelength CMOS-compatible reciprocal and nonreciprocal microwave components, such as delay lines, phase shifters, couplers, and circulators. The obtained results also explicitly show that temporally modulated systems are not bound by constraints of time-invariant systems and can achieve arbitrarily large delay-bandwidth products.

关键词： Metamaterials

来源：评论

学校读者我要写书评

暂无评论

Energetic electron precipitation driven by electromagnetic ion cyclotron waves from ELFIN’s low altitude perspective

arXiv

引用

arXiv 2022年

作者： Angelopoulos, V. Zhang, X.-J. Artemyev, A.V. Mourenas, D. Tsai, E. Wilkins, C. Runov, A. Liu, J. Turner, D.L. Li, W. Khurana, K. Wirz, R.E. Sergeev, V.A. Meng, X. Wu, J. Hartinger, M.D. Raita, T. Shen, Y. An, X. Shi, X. Bashir, M.F. Shen, X. Gan, L. Qin, M. Capannolo, L. Ma, Q. Russell, C.L. Masongsong, E.V. Caron, R. He, I. Iglesias, L. Jha, S. King, J. Kumar, S. Le, K. Mao, J. McDermott, A. Nguyen, K. Norris, A. Palla, A. Roosnovo Tam, J. Xie, E. Yap, R.C. Ye, S. Young, C. Adair, L.A. Shaffer, C. Chung, M. Cruce, P. Lawson, M. Leneman, D. Allen, M. Anderson, M. Arreola-Zamora, M. Artinger, J. Asher, J. Branchevsky, D. Cliffe, M. Colton, K. Costello, C. Depe, D. Domae, B.W. Eldin, S. Fitzgibbon, L. Flemming, A. Frederick, D.M. Gilbert, A. Hesford, B. Krieger, R. Lian, K. McKinney, E. Miller, J.P. Pedersen, C. Qu, Z. Rozario, R. Rubly, M. Seaton, R. Subramanian, A. Sundin, S.R. Tan, A. Thomlinson, D. Turner, W. Wing, G. Wong, C. Zarifian, A. Earth Planetary and Space Sciences Department Institute of Geophysics and Planetary Physics University of California Los Angeles Los AngelesCA90095 United States University of Texas at Dallas RichardsonTX75080 United States CEA DAM DIF Arpajon France Atmospheric and Oceanic Sciences Departments University of California Los AngelesCA United States Johns Hopkins University Applied Physics Laboratory LaurelMD United States Department of Astronomy Center for Space Physics Boston University BostonMA United States Mechanical and Aerospace Engineering Department Henry Samueli School of Engineering University of California Los AngelesCA90095 United States School of Mechanical Industrial Manufacturing Engineering Oregon State University CorvallisOR97331 United States University of St. Petersburg St. Petersburg Russia Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States Space Science Institute BoulderCO80301 United States Sodankylä Geophysical Observatory University of Oulu Sodankylä Finland Materials Science and Engineering Department Henry Samueli School of Engineering University of California Los AngelesCA90095 United States Deloitte Consulting New YorkNY10112 United States Computer Science Department Henry Samueli School of Engineering University of California Los AngelesCA90095 United States Microsoft RedmondWA98052 United States Physics and Astronomy Department University of California Los AngelesCA90095 United States Department of Astronomy and Astrophysics The University of Chicago ChicagoIL60637 United States Raybeam Inc. Mountain ViewCA94041 United States SpaceX HawthorneCA90250 United States Reliable Robotics Corporation Mountain ViewCA94043 United States Los Alamos National Laboratory Los AlamosNM87545 United States Mathematics Department University of California Los AngelesCA90095 United States Planet Labs PBC San FranciscoCA94107 United States KSAT Inc. De

We review comprehensive observations of electromagnetic ion cyclotron (EMIC) wave-driven energetic electron precipitation using data from the energetic electron detector on the Electron Losses and Fields InvestigatioN (ELFIN) mission, two polar-orbiting low-altitude spinning CubeSats, measuring 50-5000 keV electrons with good pitch-angle and energy resolution. EMIC wave-driven precipitation exhibits a distinct signature in energy-spectrograms of the precipitating-to-trapped flux ratio: peaks at >0.5 MeV which are abrupt (bursty) (lasting ∼17s, or ∆L ∼ 0.56) with significant substructure (occasionally down to sub-second timescale). We attribute the bursty nature of the precipitation to the spatial extent and structuredness of the wave field at the equator. Multiple ELFIN passes over the same MLT sector allow us to study the spatial and temporal evolution of the EMIC wave - electron interaction region. Case studies employing conjugate ground-based or equatorial observations of the EMIC waves reveal that the energy of moderate and strong precipitation at ELFIN approximately agrees with theoretical expectations for cyclotron resonant interactions in a cold plasma. Using 2 years of ELFIN data uniformly distributed in local time, we assemble a statistical database of ∼50 events of strong EMIC wave-driven precipitation. Most reside at L ∼ 5 − 7 at dusk, while a smaller subset exists at L ∼ 8 − 12 at post-midnight. The energies of the peak-precipitation ratio and of the half-peak precipitation ratio (our proxy for the minimum resonance energy) exhibit an L-shell dependence in good agreement with theoretical estimates based on prior statistical observations of EMIC wave power spectra. The precipitation ratio’s spectral shape for the most intense events has an exponential falloff away from the peak (i.e., on either side of ∼ 1.45 MeV). It too agrees well with quasi-linear diffusion theory based on prior statistics of wave spectra. It should be noted though that this diffusive

关键词： Radiation belts

来源：评论

学校读者我要写书评

暂无评论

High Performance GaN HEMT and Ge Fin FET Device Realizing by Atomic-layer Defect-free Etching with Chlorine Neutral Beam

High Performance GaN HEMT and Ge Fin FET Device Realizing by...

引用

International Symposium on VLSI Technology, Systems and Applications

作者： Daisuke Ohori Niraj Man Shrestha Yiming Li Jenn-Hwan Tarng Seiji Samukawa Department of Electrical and Computer Engineering National Chiao Tung University Hsinchu Taiwan 2-1-1 Katahira Aoba-ku Institute of Fluid Science Tohoku University Sendai Japan Center for mmWave Smart Radar System and Technologies National Chiao Tung University Hsinchu Taiwan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki Japan 2-1-1 Katahira Aoba-ku Advanced Institute for Materials Research Tohoku University Sendai Japan

ISBN: (数字)9781728142326

ISBN: (纸本)9781728142333

In the fabrication of semiconductor devices, reactive plasmas are widely used in key processes such as microfabrication, surface modification and film deposition, and there are now demands for processing precision at the atomic layer level, and for deposition accuracy that allows the control of structures at the molecular level. However, in ultra-miniature nanoscale devices that will become the mainstream in the future, the use of plasma processes can cause serious problems such as abnormal etching and breakdown of insulation films by the accumulation of ions or electrons emitted from the plasma as shown in Fig. 1, also the formation of surface defects (dangling bond) of over a few tens nm in depth by exposure to ultraviolet (UV) emissions from the plasma. [1] -[4] In particular, since nano-scale devices have a larger surface area compared with the bulk material, plasma processes can have a large influence on the electrical and optical properties of devices due to process-induced defects caused by ultraviolet exposure, which has not caused a problem in the presented devices of 32 nm. Furthermore, since future nanodevices will require size control of three-dimensional structures at the atomic layer level, it will be absolutely essential to control surface chemical reactions with high precision and selectivity at the atomic layer level. Neutral beam process technology has attracted attention as a way of solving these issues [5], [6], as shown in Fig. 2. The neutral beam suppresses the incidence of charged particles and UV photon radiation onto the substrate, and is able to expose the substrate only to energy controlled neutral beam (neutral beam motion energy can be precisely controlled by ion acceleration energy with the applied electric field before neutralization), resulting in ultra-precise nano-processing that can suppress the formation of defects at the atomic layer level and control surface chemical reactions with high precision.

关键词： Atomic layer deposition Process control Ions Nanoscale devices Etching Substrates Chemicals

来源：评论

学校读者我要写书评

暂无评论

All-Inorganic Quantum-Dot LEDs Based on a Phase-Stabilized α-CsPbI3Perovskite

引用

Angewandte Chemie 2021年第29期133卷

作者： Ya-Kun Wang Fanglong Yuan Yitong Dong Jiao-Yang Li Andrew Johnston Bin Chen Makhsud I. Saidaminov Chun Zhou Xiaopeng Zheng Yi Hou Koen Bertens Hinako Ebe Dongxin Ma Zhengtao Deng Shuai Yuan Rui Chen Laxmi Kishore Sagar Jiakai Liu James Fan Peicheng Li Xiyan Li Yuan Gao Man-Keung Fung Zheng-Hong Lu Osman M. Bakr Liang-Sheng Liao Edward H. Sargent Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Ontario M5S 3G4 Canada Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou Jiangsu 215123 P. R. China Department of Materials Science and Engineering University of Toronto 184 College Street Toronto Ontario M5S 3G4 Canada Present address: Department of Chemistry and Electrical & Computer Engineering Centre for Advanced Materials and Related Technologies (CAMTEC) University of Victoria Victoria British Columbia Canada Division of Physical Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia College of Engineering and Applied Sciences State Key Laboratory of Analytical Chemistry for Life Science Nanjing University Nanjing Jiangsu 210023 P. R. China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 P. R. China

The all-inorganic nature of CsPbI 3 perovskites allows to enhance stability in perovskite devices. Research efforts have led to improved stability of the black phase in CsPbI 3 films; however, these strategies—including strain and doping—are based on organic-ligand-capped perovskites, which prevent perovskites from forming the close-packed quantum dot (QD) solids necessary to achieve high charge and thermal transport. We developed an inorganic ligand exchange that leads to CsPbI 3 QD films with superior phase stability and increased thermal transport. The atomic-ligand-exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Operando measurements of the temperature of the LEDs indicate that KI-exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23 % with an electroluminescence emission centered at 640 nm (FWHM: ≈31 nm). These red LEDs provide an operating half-lifetime of 10 h (luminance of 200 cd m −2 ) and an operating stability that is 6× higher than that of control devices.

关键词： CsPbI3 quantum dots inorganic ligand exchange perovskite LEDs pure red emission strain engineering

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：