检索结果-南通市图书馆

Chinese Physics Letters 2006年第4期23卷 907-910页

作者：李斌斌修向前张荣陶志阔陈琳谢自力郑有炓贺博 Jiangsu Provincial Key laboratory of Advanced photonic and electronic materials Department of Physics Nanjing University Nanjing 210093 National Synchrotron Radiation laboratory University of Science and Technology of China Hefei 230026

Zn1-xNixO （x = 0.001, 0.01, 0.02, 0.05 and 0.20） powders are prepared by sol-gel method. An extended x-ray absorption fine structure technique （EXAFS） for the Ni *** is employed to probe the local structures around Ni atoms doped in ZnO powders by fluorescence mode. The near edge EXAFS of the samples does not change in the range of Ni concentration from x = 0.001 to 0.05, which is consistent with the results of x-ray diffraction of the samples. The simulation results for the first shell EXAFS signals indicated that Ni atoms are substituted in Zn sites.

关键词： ABSORPTION FINE-STRUCTURE thin-filmS FERROMAGNETISM ORIGIN

All-inorganic transparent Hf_(0.85)Ce_(0.15)O_(2)ferroelectric thin films with high flexibility and stability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5065-5072页

作者： Sheng-Tao Mo Kai-Ming Feng Jing-Lin Pang Kuo Ouyang Li-Mei Jiang Qiong Yang Biao Zhang Jie Jiang School of materials science and engineering Xiangtan UniversityXiangtan 411105China Hunan Provincial Key laboratory of thin film materials and Devices Xiangtan UniversityXiangtan 411105China Key laboratory of Low Dimensional materials and Application Technology Ministry of EducationXiangtan UniversityXiangtan 411105China

electronic devices that are transparent and flexible have a wide range of applications in the domains of vital sign parameter monitoring,health management,and so *** memory is a revolutionary nonvolatile memory that is ideal for data storage and processing in transparent flexible electronic *** this study,Ce-doped hafnium oxide ferroelectric thin film is manufactured on mica substrate by the chemical solution deposition with transparent indium tin oxide(ITO)thin films as the bottom *** transmittance of mica/ITO/Hf_(0.85)Ce_(0.15)O_(2)thin film is over 80%.The 2Pr of the transparent flexible Hf_(0.85)Ce_(0.15)O_(2)ferroelectric thin film is increased by about 22.4%and the Ec is reduced by 26.7%compared with those of Hf_(0.85)Ce_(0.15)O_(2)ferroelectric thin film grown on p+-Si *** transparent flexible Hf_(0.85)Ce_(0.15)O_(2)ferroelectric thin film can remain keeping good quality when being bent under±2.5 mm bending ***,degradation of polarization,retention,and endurance performance was not obvious even at a bending radius of 5.0 mm after 104 bending *** research provides a new strategy and an important experimental basis for the development and implementation of transparent flexible ferroelectric memories.

关键词： flexible Hf_(0.85)Ce_(0.15)O_(2)thin films transparent thin films ferroelectric properties

A strategy to achieve high loading and high energy density Li-S 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2期30卷 340-346,I0012页

作者： Fei Yin Qi Jin Hong Gao XiTian Zhang ZhiGuo Zhang Key laboratory for photonic and electronic Bandgap materials Ministry of ducationSchool of Physics and Electronic Engineering Harbin Normal tnivrstyHarbin 150025HeilongjiangChina Condensed Mater science and Technology Institute Department of PhysicsHarbin lustitute of TechnologyHarbin 15001Helongiang China

Lithium-sulfur(Li-S) batteries are one of the most promising rechargeable storage devices due to the high theoretical energy ***,the low areal sulfur loading impedes their commercial ***,a 3 D free-standing sulfur cathode scaffold is rationally designed and fabricated by coaxially coating polar Ti_3 C_2 T_x flakes on sulfur-impregnated carbon cloth(Ti_3 C_2 T_x@S/CC) to achieve high loading and high energy density Li-S batteries,in which,the flexible CC substrate with highly porous structure can accommodate large amounts of sulfur and ensure fast electron transfer,while the outer-coated Ti_3 C_2 T_x can serve as a polar and conductive protective layer to further promote the conductivity of the whole electrode,achieve physical blocking and chemical anchoring of lithium-polysulfides as well as catalyze their *** to these advantages,at a sulfur loading of 4 mg cm^(-2),Li-S cells with Ti_3 C_2 T_x@S/CC cathodes can deliver outstanding cycling stability(746.1 mAh g^(-1) after 200 cycles at1 C),superb rate performance(866.8 mAh g^(-1) up to 2 C) and a high specific energy density(564.2 Wh kg^(-1) after 100 cycles at 0.5 C).More significantly,they also show the commercial potential that can compete with current lithium-ion batteries due to the high areal capacity of 6.7 mAh cm^(-2) at the increased loading of 8 mg cm^(-2).

关键词： Lithium-sulfur batteries High energy density Ti_(3)C_(2)T_(x) High sulfur loading 3D free-standing sulfur cathode

Characteristics of photonic nanojets from two-layer dielectric hemisphere

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第11期26卷 199-205页

作者：刘昀玥刘贤超李玲陈卫东陈艳黄跃容谢征微 College of Physics and electronic engineering Sichuan Normal University State Key laboratory of electronic thin films and Integrated Devices School of Optoelectronic InformationUniversity of Electronic Science and Technology

The properties of the photonic nanojet generated by a two-layer dielectric microsphere are studied. Simulation results indicate that this novel structure can generate a photonic nanojet outside its volume when the refractive index contrast relative to the background medium is higher than 2：1 in the condition of plane wave incidence. When the refractive index is smaller than 2, we show that an ultralong nanojet generated by the two-layer hemisphere has an extension of 28.2 wavelengths, and compared with the homogeneous dielectric hemisphere, it has superior performance in jet length and focal distance. Its dependence on the configuration and refractive index is investigated numerically. According to the simulation of the two-layer dielectric microsphere, a photonic nanojet with a full width at half maximum（FWHM） less than 1/2 wavelength is obtained and the tunable behaviors of the photonic nanojet are demonstrated by changing the reflective indices of the material or radius contrast ratio.

关键词： photonic nanojet hemisphere micro-optics subdiffraction

Tunable amplified spontaneous emissions by dimensional-controlled microcrystal synthesis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第1期29卷 209-212页

作者： Hui-Ying Liu Ye-Fen Li Qing-Gang Gao Zhen-Dong Liu Hong-Bing Fu School of materials science and engineering Beijing Institute of Fashion Technology Beijing Key laboratory for Optical materials and photonic Devices Department of ChemistryCapital Normal University

The excited-state intramolecular proton transfer molecules based on chalcone （E）-3-（4＇-dimethylami- nophenyl）-l-（4＇-fluoro-2＇-hydroxyphenyl）-2-propen-l-one （DMF-HPPO） have been synthesized under microwave irradiation. One-dimensional （1D） microwires and 2D microdisks of DMF-HPPO have been selectively prepared by controlling the solution polarity. XRD results revealed the two microcrystals exhibit distinct diffraction patterns, which indicates that they have belonged to different crystalline nature. The microcrystals demonstrate shape-dependent amplified spontaneous emissions （ASE） that the emission of ID microwire is central around 618 nm and the 2D microdisk emits fluorescence at 650 nm. This result reveals the controlled synthesis of two microcrystals and their consequent multicolor amplified spontaneous emission, providing considerable promise for the development and application of new opto-electronic devices.

关键词： Amplified spontaneous emissionSelf-assemblyMicrostructuresLuminescenceOptical properties

Magneto-optical Kerr Effect in Co/Alq3 Granular films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2009年第1期26卷 335-338页

作者：殷建芳倪刚吴俊奇袁明韵盛鹏王松有金庆原 department of Optics science and engineering Fudan University Shanghai 200433 State Key laboratory for Advanced photonic materials and Devices Fudan University Shanghai 200433 laboratory of Advanced materials Fudan University Shanghai 200433

A series of Co/Alq3 granular film samples are prepared using co-evaporating technique. The microstructures and magnetic properties are investigated. The Kerr spectra and optical constants of Cox（Alq3）1-x （0.19 ≤ x ≤ 1） granular films are measured using a magneto-optical Kerr spectrometer and a spectroscopic ellipsometer in the 1.5-4.5 eV photon energy range. The Kerr rotation reaches the maximum value of 0.5° in the x = 0.65 sample. The relationship between enhanced Kerr rotation and optical constants is discussed, and the concentration dependence of MOKE spectra is also investigated.

关键词： cobalt discontinuous metallic thin films ferromagnetic materials Kerr magneto-optical effect magnetic hysteresis

Active site synergy of the mixed-phase cobalt diselenides with slight lattice distortion for highly reversible and stable lithium oxygen 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 materials science & Technology 2021年第33期92卷 159-170页

作者： Minglu Li Chaozhu Shu Anjun Hu Yu Yan Miao He Jianping Long College of materials and Chemistry&Chemical engineering Chengdu University of TechnologyChengdu 610059China State Key laboratory of electronic thin films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China

Many non-precious metal-based catalysts with high intrinsic activity for catalytic reactions are prone to structural degradation in practical application,which leads to poor *** this work,we propose c-CoSe_(2)/o-CoSe_(2)as the oxygen electrode of lithium-oxygen batteries(LOBs)to improve its cycle *** heterogeneous interface inside c-CoSe_(2)/o-CoSe_(2)leads to an increase in the covalence bonds between Co and Se ions,which greatly enhances the robustness of the crystal lattice,thereby improving the stability of the *** addition,the strong interaction between the mixed phases is favorable for adjusting the electron density around the active sites and boosting oxygen electrode ***,the epitaxial growth of o-CoSe_(2)on c-CoSe_(2)will cause abundant heterogeneous interfaces and slight lattice distortion along the interfaces,thereby providing sufficient catalytic reaction *** DFT calculation results show that the optimized adsorption of intermediates at the heterogeneous interface plays an important role in boosting oxygen electrode reactions and improving the electrochemical performance of *** experimental results show that LOBs with the c-CoSe_(2)/o-CoSe_(2)electrodes exhibit outstanding performance,including large specific capacity of about 23,878 m A h g^(-1),high coulombic efficiency of up to 93.66%,and excellent stability of over 176 cycles(1410 h).

关键词： Li-O_(2)battery Oxygen electrode Structure design Lattice distortion Jahn-Teller effect

Composing atomic transition metal sites for high-performance bifunctional oxygen electrocatalysis in rechargeable zinc-air batteries

在线全文

学校读者我要写书评

暂无评论

颗粒学报:英文版 2023年第6期77卷 146-152页

作者： Juan Wang Chang-Xin Zhao Jia-Ning Liu Ding Ren Xinzhi Ma Bo-Quan Li Jia-Qi Huang Qiang Zhan School of materials science and engineering Beijing Institute of TechnologyBeijing100081China Advanced Research Institute of Multidisciplinary science Beijing Institute of TechnologyBeijing100081China Beijing Key laboratory of Green Chemical Reaction engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing100084China Key laboratory for photonic and electronic Bandgap materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin150025China

Rechargeable zinc-air batteries have attracted extensive attention as clean,safe,and high-efficient en-ergy storage ***,the oxygen redox reactions at cathode are highly sluggish in kinetics and severely limit the actual battery *** transition metal sites demonstrate high electro-catalytic activity towards respective oxygen reduction and evolution,while high bifunctional electro-catalytic activity is seldomly *** a strategy of composing atomic transition metal sites is proposed to fabricate high active bifunctional oxygen electrocatalysts and high-performance recharge-able zinc-air ***,atomic Fe and Ni sites are composed based on their respective high electrocatalytic activity on oxygen reduction and *** composite electrocatalyst demonstrates high bifunctional electrocatalytic activity(ΔE=0.72 V)and exceeds noble-metal-based Pt/C+Ir/C(ΔE=0.79 V).Accordingly,rechargeable zinc-air batteries with the composite electrocatalyst realize over 100 stable cycles at 25 mA *** work affords an effective strategy to fabricate bifunctional oxygen electrocatalysts for high-performance rechargeable zinc-air batteries.

关键词： Rechargeable zinc-air batteries Bifunctional oxygen electrocatalysis Noble-metal-free electrocatalysts Oxygen reduction reaction Oxygen evolution reaction

Moiré-superlattice MXenes enabled ultra-stable K-ion storage in neutral electrolyte

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5006-5017页

作者： Qiong Wu Yanhui Xue Shaofei Chao Fufa Wu Muhammad Sufyan Javed Lu Li Wei Zhang School of materials science and engineering Liaoning University of TechnologyJinzhou 121001China School of Physical science and Technology Lanzhou UniversityLanzhou 730000China Key laboratory for photonic and electronic Bandgap materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China Key laboratory of Automobile materials MOE School of Materials Science&EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012China

Ti_(3)C_(2)MXene is an auspicious energy storage material due to its metallic conductivity and layered ***,in the real working condition of electrochemical energy storage with long cycle charging-discharging,a structural collapse is usually caused by the stacking of its layers creating a large attenuation of specific *** by the superlattice effect of magic angle graphene,we conducted microscopical regulation of rotation mismatch on the Ti_(3)C_(2)lattice;consequently,a hexagonal fewlayered Ti_(3)C_(2)free-standing film constructed with Moiré-*** finding not only solves the problem of Ti_(3)C_(2)structural collapse but also dramatically improves the specific capacitance of Ti_(3)C_(2)as a supercapacitor electrode under long cycle charging and *** ultra-stable energy storage of this electrode material in a neutral aqueous electrolyte was ***,the formation mechanism of rotating Moirépattern is revealed through microscopy and microanalysis of the produced Moirépattern,assisted with modeling and analyzing the underlying mechanism between the Moirépattern and the rotation *** work provides experimental and theoretical support for future construction of Moiré-superlattice structure for a wide range of MXene phases and is undoubtedly promoting the development of MXene materials in the field of energy storage.

关键词： Ti_(3)C_(2)MXene Moiré-superlattice microwave-assisted etching specific capacitance

Influence of an Fe cap layer on the structural and magnetic properties of Fe_(49)Pt_(51)/Fe bi-layers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第6期18卷 2565-2570页

作者：段朝阳马斌魏福林张宗芝金庆原 State Key laboratory for Advanced photonic materials and Devices and Department of Optical Science and EngineeringFudan University Research Institute of Magnetic materials Lanzhou University

The influences of an Fe cap layer on the structural and magnetic properties of FePt/Fe bi-layers are investigated. Compared with single FePt alloy films, a thin Fe layer can affect the crystalline orientation and improve the chemical ordering of L10 FePt films. Moreover, the coercivity increases when a thin Fe layer covers the FePt layer. Beyond a critical thickness, however, the Fe cover layer quickens the magnetization reversal of Fe49Pt51/Fe bi-layers by their exchange coupling.

关键词： Fe cap layer Llo FePt magnetism