Composites of nanotubular polyaniline containing Fe3O4 nanoparticles
Long Yun-Ze (龙云泽)a, Chen Zhao-Jia (陈兆甲)a, Liu Zhen-Xing (刘振兴)a, Zhang Zhi-Ming (张志明)b, Wan Mei-Xiang (万梅香)b, Wang Nan-Lin (王楠林)a
a Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b 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 Fe3O4 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 $\chi=\chi_P^*+C/T$. With increasing weight ratio of Fe3O4, the electrical conductivity and temperature- independent susceptibility $\chi_P^*$ increase, and the Curie-type susceptibility is suppressed at low temperatures. Further discussions have been given. The PANI-H3PO4/Fe3O4 composite containing 27wt% of Fe3O4 nanoparticles is superparamagnetic, exhibiting very little hysteresis even at 5K.
Received: 23 September 2002
Revised: 04 December 2002
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 50133010 and 29974037).
Cite this article:
Long Yun-Ze (龙云泽), Chen Zhao-Jia (陈兆甲), Liu Zhen-Xing (刘振兴), Zhang Zhi-Ming (张志明), Wan Mei-Xiang (万梅香), Wang Nan-Lin (王楠林) Composites of nanotubular polyaniline containing Fe3O4 nanoparticles 2003 Chinese Physics 12 433
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