A Chemical Synthesis of Ferromagnetic Zn0.99Co0.01O Nano-Needles  

作　　者：毕红 陈乾旺 尤逢永 周小丽 

机构地区：[1]Structure Research Laboratory and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026 [2]Department of Chemistry, Anhui University, Hefei 230039 [3]Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093

出　　处：《Chinese Physics Letters》2006年第7期1907-1910,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 20401001, the Key Project of Anhui Provincial Science and Technology Department under Grant No 04022075, the Project of Anhui Provincial Educational Department under Grant No 2004jq113, and the Fund of Laboratory of Solid State Microstructures, Nanjing University under Grant No M031803.

摘　　要：Zn0.99Co0.01O nano-needles are synthesized by using pure ZnO powder as the starting material via chemical reactions in ammonia aqueous solution. The nano-needles show the room-temperature ferromagnetism （RTFM） characterized by using a superconducting quantum interference device. Non-reductive chemical synthesis steps ensure to prevent forming Co-metal nanoclusters within the doped sample. All the results of thermal gravimetric analysis, Fourier transform infrared spectroscopy, x-ray diffraction and ultraviolet spectroscopy demonstrate that Co ions have doped into ZnO lattices and occupied some Zn sites without changing the wurtzite structure of ZnO lattices, and no potential second phase except for the doped Co ions substituting the Zn sites in ZnO lattice can account for the observed RTFM behaviour. Moreover, the synthesis process is of high reproducibility over 80% which is higher than that of commonly-used sol-gel method.Zn0.99Co0.01O nano-needles are synthesized by using pure ZnO powder as the starting material via chemical reactions in ammonia aqueous solution. The nano-needles show the room-temperature ferromagnetism （RTFM） characterized by using a superconducting quantum interference device. Non-reductive chemical synthesis steps ensure to prevent forming Co-metal nanoclusters within the doped sample. All the results of thermal gravimetric analysis, Fourier transform infrared spectroscopy, x-ray diffraction and ultraviolet spectroscopy demonstrate that Co ions have doped into ZnO lattices and occupied some Zn sites without changing the wurtzite structure of ZnO lattices, and no potential second phase except for the doped Co ions substituting the Zn sites in ZnO lattice can account for the observed RTFM behaviour. Moreover, the synthesis process is of high reproducibility over 80% which is higher than that of commonly-used sol-gel method.

关 键 词：ROOM-TEMPERATURE FERROMAGNETISM DOPED ZINC-OXIDE ZNO THIN-FILMS MAGNETICSEMICONDUCTORS ELECTRONIC-STRUCTURE SPINTRONICS FABRICATION 

分 类 号：O482.523[理学—固体物理]