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Composites of nanotubular polyaniline containing Fe3O4 nanoparticles
作者姓名:龙云泽  陈兆甲  刘振兴  张志明  万梅香  王楠林
作者单位:Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;Organic Solid Laboratory, Centre for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;Organic Solid Laboratory, Centre for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China;Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
基金项目:Project supported by the National Natural Science Foundation of China (Grant Nos 50133010 and 29974037).
摘    要:Results of charge-transport and magnetic measurements of nanotubular polyaniline (PANI) composites containing Fe_3O_4 nanoparticles (~10nm) synthesized by a "template-free" method are reported. The T^{-1/2} resistivity has been observed, and dc magnetic susceptibility data are fitted to an equation χ=χ^*_P+C/T. With increasing weight ratio of Fe_3O_4, the electrical conductivity and temperature- independent susceptibility χ^*_P increase, and the Curie-type susceptibility is suppressed at low temperatures. Further discussions have been given. The PANI-H_3PO_4/Fe_3O_4 composite containing 27wt% of Fe_3O_4 nanoparticles is superparamagnetic, exhibiting very little hysteresis even at 5K.

关 键 词:Fe3O4  四氧化三铁  纳米粒子  聚苯胺  纳米管  电阻系数  磁化系数  磁性材料
收稿时间:2002-09-23

Composites of nanotubular polyaniline containing Fe3O4 nanoparticles
Long Yun-Ze,Chen Zhao-Ji,Liu Zhen-Xing,Zhang Zhi-Ming,Wan Mei-Xiang and Wang Nan-Lin.Composites of nanotubular polyaniline containing Fe3O4 nanoparticles[J].Chinese Physics B,2003,12(4):433-437.
Authors:Long Yun-Ze  Chen Zhao-Ji  Liu Zhen-Xing  Zhang Zhi-Ming  Wan Mei-Xiang and Wang Nan-Lin
Institution:Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Organic Solid Laboratory, Centre for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
Abstract:Results of charge-transport and magnetic measurements of nanotubular polyaniline (PANI) composites containing Fe_3O_4 nanoparticles (~10nm) synthesized by a "template-free" method are reported. The T^{-1/2} resistivity has been observed, and dc magnetic susceptibility data are fitted to an equation χ=χ^*_P+C/T. With increasing weight ratio of Fe_3O_4, the electrical conductivity and temperature- independent susceptibility χ^*_P increase, and the Curie-type susceptibility is suppressed at low temperatures. Further discussions have been given. The PANI-H_3PO_4/Fe_3O_4 composite containing 27wt% of Fe_3O_4 nanoparticles is superparamagnetic, exhibiting very little hysteresis even at 5K.
Keywords:polyaniline  nanotube  resistivity  magnetic susceptibility
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