Composites of nanotubular polyaniline containing Fe3O4 nanoparticles

doi:10.1088/1009-1963/12/4/316

中国物理B ›› 2003, Vol. 12 ›› Issue (4): 433-437.doi: 10.1088/1009-1963/12/4/316

Composites of nanotubular polyaniline containing Fe₃O₄ nanoparticles

龙云泽¹, 陈兆甲¹, 刘振兴¹, 王楠林¹, 张志明², 万梅香²

(1)Laboratory of Extreme Condition Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)Organic Solid Laboratory, Centre for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

收稿日期:2002-09-23 修回日期:2002-12-04 出版日期:2003-04-16 发布日期:2005-03-16
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos 50133010 and 29974037).

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; ^bOrganic Solid Laboratory, Centre for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

Received:2002-09-23 Revised:2002-12-04 Online:2003-04-16 Published:2005-03-16
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos 50133010 and 29974037).

摘要/Abstract

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.

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.

Key words: polyaniline, nanotube, resistivity, magnetic susceptibility

中图分类号: (Composite materials)

72.80.Tm

75.30.Cr (Saturation moments and magnetic susceptibilities) 75.50.Tt (Fine-particle systems; nanocrystalline materials)

龙云泽, 陈兆甲, 刘振兴, 张志明, 万梅香, 王楠林. Composites of nanotubular polyaniline containing Fe₃O₄ nanoparticles[J]. 中国物理B, 2003, 12(4): 433-437.

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[J]. Chinese Physics, 2003, 12(4): 433-437.

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Composites of nanotubular polyaniline containing Fe₃O₄ nanoparticles

Composites of nanotubular polyaniline containing Fe₃O₄ nanoparticles

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