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Magnetic and conducting Fe3O4–polypyrrole nanoparticles with core-shell structure

✍ Scribed by Jianguo Deng; Yuxing Peng; Chuanlan He; Xingping Long; Pei Li; Albert S C Chan

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
189 KB
Volume
52
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

Magnetic and conducting Fe~3~O~4~–polypyrrole nanoparticles with core‐shell structure were prepared in the presence of Fe~3~O~4~ magnetic fluid in aqueous solution containing sodium dodecylbenzenesulfonate (NaDS) as a surfactant and dopant. Both the conductivity and magnetization of the composites depend strongly on the Fe~3~O~4~ content and the doping degree. With increase of Fe~3~O~4~ content in the composite, the conductivity at room temperature decreases, but the saturated magnetization and coercive force increase. Transmission electron microscopy (TEM) images of Fe~3~O~4~ and Fe~3~O~4~–polypyrrole particles show almost spherical particles with diameters ranging from 20 to 30 and 30 to 40 nm, respectively. The thermal stability of Fe~3~O~4~–polypyrrole composites is higher than that of pure polypyrrole. Studies of IR, UV–visible and X‐ray photoelectron spectroscopy (XPS) spectra suggest that the increased thermal stability may be due to interactions between Fe~3~O~4~ particles and polypyrrole backbone. Copyright © 2003 Society of Chemical Industry

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