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Special magnetic phenomena in heavily doped La_(0.7-x)Dy_xSr_(0.3)MnO_3 system

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Science China(Physics,Mechanics & Astronomy) 2008年第1期51卷 90-97页

作者： LIU Ning 1,2 ,YAN GuoQing 1,3 ,CAI ZhiRang 1 ,PI Li 2 ,ZHANG Bei 2 &TONG Wei 2 1 Department of Physics,Suzhou College,Suzhou 234000,China 2 Structure Research laboratory,University of Science and Technology of China,Hefei 230026,China 3 national laboratory of solid state microstructures,Physics Department,Nanjing University,Nanjing 210093,China 1. Department of Physics Suzhou College Suzhou 234000 China 2. Structure Research laboratory University of Science and Technology of China Hefei 230026 China 3. national laboratory of solid state microstructures Physics Department Nanjing University Nanjing 210093 China

The magnetism in heavily Dy doped La0.7-xDyxSr0.3MnO3(0.40≤x≤0.70)system is studied in this *** M-T relation seems to be complicated with the increase of *** sample with x=0.40,AFM behavior exists at T≤TN and M-T curves under zero field cooling(ZFC)and field cooling(FC)exhibit typical behavior of spincluster glass state above *** the sample with x=0.50,the M-T curve under ZFC exhibits a valley at a low temperature while the M-T curve under FC exhibits the negative magnetization below *** samples with x=0.60,0.70,their ZFC M-T curves are similar to that of x=0.50,but the FC M-T curves do not exhibit negative values any *** the peculiar phenomena above are well explained by Néel double-lattice model combined with M-H relation at typical *** molecular field theory fits well the negative magnetization for x=0.50.

关键词： heavily doped special magnetic phenomena double-lattice model

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团簇的结构和奇异性质

物理学进展 1993年第1期13卷 266-279页

作者：王广厚固体微结构物理国家重点实验室

团簇(Clusterss或 Microclusters)是由几个至几百个原子或分子构成的微观或亚微观聚集体,具有一系列既不同于单个原子分子又不同于大块固体的奇异性质、本文重点讨论一些金属、碱金属卤化物和惰性元素团簇的性质,如幻数和同位素效应,超... 详细信息

团簇(Clusterss或 Microclusters)是由几个至几百个原子或分子构成的微观或亚微观聚集体,具有一系列既不同于单个原子分子又不同于大块固体的奇异性质、本文重点讨论一些金属、碱金属卤化物和惰性元素团簇的性质,如幻数和同位素效应,超团簇的形成和分形凝聚,以及团簇构成纳米固体的界面徒动和结构重排。

关键词：团簇结构聚集体凝聚态

THE IMPROVEMENT OF ELECTRON FIELD EMISSION FROM AMORPHOUS CARBON FILMS duE TO HYDROGEN PLASMA CHEMICAL ANNEALING EFFECT

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 497-500页

作者： J. Xu, X.H. Huang, L. Wang, W. Li and K.J. Chen (national laboratory of solid state microstructures and Departmeat of Physics, Nanjing University, Nanjing 210093, China) J.B. Xu (Department of Electronic Engineering, The Chinese University of Hong Kong, S Dept. of Phys. Nanjing Univ. Nanjing 210093 China

Hydrogenated amorphous carbon films were fabricated by using layer-by-layer deposition method and hydrogen dilution method in a small d.c.-assisted plasma enhanced chemical vapor deposition system. It was found that the hydrogen plasma treatment could change the sp2/sp3 ratio to some extent by chemical etching. The improvements of field emission characteristics were observed compared with that from conventionally deposited a-C films, which can be attributed to the large field enhancement effect due to the inhomogeneous distribution of nanometer scale sp2 clusters and the reduction of the surface emission barrier due to the hydrogen termination.

关键词： field emission amorphous carbon hydrogen plasma treatment

Construction of MnS/MoS_(2) heterostructure on two-dimensional MoS_(2) surface to regulate the reaction pathways for high-performance Li-O_(2) batteries

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Journal of Energy Chemistry 2024年第6期93卷 443-452,I0012页

作者： Guoliang Zhang Han Yu Xia Li Xiuqi Zhang Chuanxin Hou Shuhui Sun Yong du Zhanhu Guo Feng Dang Key laboratory for Liquid-solid Structure Evolution and.Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061ShandongChina School of Environmental and Material Engineering Yantai UniversityYantai 264005ShandongChina Institute national de la Recherche Scientifique CentreÉnergie Matériaux et TélécommunicationsVarennesQuébec J31S2Canada state Key laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK

The inherent catalytic anisotropy of two-dimensional(2D) materials has limited the enhancement of LiO_(2) batteries(LOBs) performance due to the significantly different adsorption energies on 2D and edge *** the adsorption strength in 2D materials to the reaction intermediates is essential for achieving high-performance ***,a MnS/MoS_(2) heterostructure is designed as a cathode catalyst by adjusting the adsorption behavior at the *** from the toroidal-like discharge products on the MoS_(2) cathode,the MnS/MoS_(2) surface displays an improved adsorption energy to reaction species,thereby promoting the growth of the film-like discharge *** can disturb the layer growth of MoS_(2),in which the stack edge plane features a strong interaction with the intermediates and limits the growth of the discharge *** and theoretical results confirm that the MnS/MoS_(2) heterostructure possesses improved electron transfer kinetics at the interface and plays an important role in the adsorption process for reaction species,which finally affects the morphology of Li_2O_(2),In consequence,the MnS/MoS_(2) heterostructure exhibits a high specific capacity of 11696.0 mA h g^(-1) and good cycle stability over 1800 h with a fixed specific capacity of 600 mA h g^(-1) at current density of100 mA g^(-1) This work provides a novel interfacial engineering strategy to enhance the performance of LOBs by tuning the adsorption properties of 2D materials.

关键词： Li-O_(2)batteries Two-dimensional materials MnS/MoS_(2)heterostructure Edge plane Adsorption behavior

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凝聚态物理学的新进展Ⅲ

物理学进展 1991年第4期11卷 373-455页

作者：冯端金国钧固体微结构物理国家重点实验室南京大学固体物理研究所

本文综述凝聚态物理学近几年来的重要进展,列举了一些事例予以阐述。在第Ⅲ部分中涉及的主题为细小体系及凝聚态中的非线性现象。讨论的问题包括:介观系统中的量子相干性和电子输运,团簇的幻数和壳层结构,离子阱中库仑团簇的类相变行为... 详细信息

本文综述凝聚态物理学近几年来的重要进展,列举了一些事例予以阐述。在第Ⅲ部分中涉及的主题为细小体系及凝聚态中的非线性现象。讨论的问题包括:介观系统中的量子相干性和电子输运,团簇的幻数和壳层结构,离子阱中库仑团簇的类相变行为,魔梯,自组织临界性和非平衡态流体中空时图样的形成与演化。

关键词：凝聚态物理学细小体系非线性

Photo-thermal synergistic excitation:Feasible strategy to detect ethanol for wide bandgap ZIF-8at low work temperature

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Journal of Environmental Sciences 2024年第4期138卷 112-120页

作者： Shuhao Shi Qian du Ming Hou Xiaolei Ye Li Yang Shenghui Guo Jianhong Yi Ullah Ehsan Hongbo Zeng state Key laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G 2V4Canada FEMTO-ST Institute(UMR CNRS 6174) Universite de Bourgogne Franche-Comte(UBFC)Universite de technologie de Belfort Montbéliard(UTBM)Site de MontbeliardBelfort F-90010France Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Zeolitic Imidazolate Framework-8(ZIF-8)material was prepared by chemical precipitation *** microstructure and physical properties of the as-prepared samples were characterized by XRD,BET,FESEM and UV *** self-made four-channel measurement device was used to test the gas sensitivity of ZIF-8 material toward ethanol gas under photo-thermal synergistic *** results showed that the sample was typical ZIF-8(E_(g)=4.96 eV)with a regular dodecahedron shape and the specific surface is up to 1793 m^(2)/*** as-prepared ZIF-8 has a gas response value of 55.04 to 100 ppm ethanol at 75℃ and it shows good gas sensing selectivity and repeated *** excellent gas sensitivity can be attributed to the increase of free electron concentration in the ZIF-8 conduction band by photo-thermal synergistic excitation,and the large specific surface area of ZIF-8 material provides more active sites for gas-solid surface *** reaction mechanism of ZIF-8 material under multi-field excitation was also discussed.

关键词： ZIF-8 material Photo-thermal synergistic excitation UV-light irradiation Photon-generated electron and hole Gas-sensitive property

LARGE　PIEZORESISTANCE　AND　PRESSURE－INduCED　METAL－SEMICONduCTOR　TRANSISTION　IN　THE　PEROVSKITE－LIKE　La－Ar－Mn－O

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南京大学学报(自然科学) 1996年第4期 140-142页

作者： Zhang Ning 1),2) Ding Weiping 1) ,Chen Ying 1) Gao Rong 2) du Youwei 1) Xing Dingyu 1) Feng duang 1) (1) national laboratory of solid state microstructures,Nanjing University,210093,Nanjing,PRC 2) Departmen

ＬＡＲＧＥＰＩＥＺＯＲＥＳＩＳＴＡＮＣＥＡＮＤＰＲＥＳＳＵＲＥ┐ＩＮＤＵＣＥＤＭＥＴＡＬ┐ＳＥＭＩＣＯＮＤＵＣＴＯＲＴＲＡＮＳＩＳＴＩＯＮＩＮＴＨＥＰＥＲＯＶＳＫＩＴＥ┐ＬＩＫＥＬａ┐Ａｒ┐Ｍｎ┐ＯＺｈａｎｇＮｉｎ... 详细信息

ＬＡＲＧＥＰＩＥＺＯＲＥＳＩＳＴＡＮＣＥＡＮＤＰＲＥＳＳＵＲＥ┐ＩＮＤＵＣＥＤＭＥＴＡＬ┐ＳＥＭＩＣＯＮＤＵＣＴＯＲＴＲＡＮＳＩＳＴＩＯＮＩＮＴＨＥＰＥＲＯＶＳＫＩＴＥ┐ＬＩＫＥＬａ┐Ａｒ┐Ｍｎ┐ＯＺｈａｎｇＮｉｎｇ１），２）ＤｉｎｇＷｅｉｐｉｎｇ...

关键词： Piezoresistance Magnetism Transporation

LASER LIFT-OFF OF GaN THIN FILMS FROM SAPPHIRE SUBSTRATES

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 448-452页

作者： J. Xu, R. Zhang, Y.P. Wang, X.Q. Xiu, S.L. Gu, B. Shen, Y. Shi, Z.G. Liu and Y.D. Zheng (Department of Physics and national laboratory of solid state microstructures, Nanjing University, Nanjing 210093, China) Dept. of Phys. Nanjing Univ. Nanjing 210093 China

Gallium Nitride film was successfully separated from sapphire substrate by laser radiation. The absorption of the 248 nm radiation by the GaN at the interface results in rapid thermal decomposition of interfacial layer, yielding metallic Ga and N2 gas. The substrate can be easily removed by heating above the Ga melting point (29°C). X-ray diffraction, atomic force microscopy and photoluminescence of GaN before and after lift-off process have been performed, which demonstrated that the separation and transfer process do not alter the structural quality of the GaN films. And further discussions on the threshold energy and crack-free strategies of laser lift-off process have also been presented.

关键词： Gallium compounds Laser beam effects Nitrides Sapphire Separation

Optical Properties of One-dimensional Three-component Photonic Band Gap Structure

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The Journal of China Universities of Posts and Telecommunications 2003年第2期10卷 22-26,33页

作者： CAI Xiang bao (Department of Applied Mathematics and Physics, Nanjing University of Posts and Telecommunications, Nanjing 210003, P.R.China national laboratory of solid state microstructures, Nanjing University, Nanjing 210093, P.R.China) Department of Applied Mathematics and Physics Nanjing University of Posts and Telecommunications Nanjing 210003 P. R. China

Theoretical study of the optical properties of one dimensional three component photonic band gap structure, which is composed of three alternating dielectric layers of different refractive indices and thickness in a unit cell, is performed. This one dimensional photonic band gap structure exhibits the transparency band and forbidden band. We find that there are several mini bands of the allowed transmission to be created within the photonic band gap region of the structure if a defect designed specially is introduced inside the structure. This characteristic is very important for some practical applications.

关键词： photonic crystal photonic band gap optical property forbidden band