PPylayeronFeO聚吡咯包覆四氧化三铁.pdfVIP

Applied Surface Science 218 (2003) 215–221 Magnetic and conducting particles: preparation of polypyrrole layer on Fe3O4 nanospheres a a a,* a b Wei Chen , Xingwei Li , Gi Xue , Zhaoqung Wang , Wenqing Zou aDepartment of Polymer Science, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, PR China bNational Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, PR China Received 9 February 2003; received in revised form 14 April 2003; accepted 14 April 2003 Abstract We reported here the preparation of Fe O –polypyrrole (PPy) nanocomposites with both magnetic and conducting properties. 3 4 The magnetic properties of the resulting composites were investigated by vibrating sample magnetometer (VSM). The Fe O –PPy 3 4 nanocomposites had coercive force from 98.4 to 116.3 Oe and saturation magnetization from 0.268 to 9.23 emu/g with the increasing Fe O content. The electrical conductivities ranged from 105 to 102 S/cm, depending on the Fe O content. The 3 4 3 4 average size of Fe O –PPy nanocomposites with core-shell structure was about 50 nm. Structural characterizations by Fourier 3 4 transform infrared (FTIR) and thermogravimetric analysis (TGA) proved the interaction between Fe3O4 and PPy chains. # 2003 Elsevier Science B.V. All rights reserved. Keywords: Core-shell structure; Poly