Electropolymerization and multifunctional properties of novel polypyrrole films embedded with Co nanoparticles
Electropolymerization and multifunctional properties of novel polypyrrole films embedded with Co nanoparticles
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Co纳米粒子嵌入的新型聚吡咯薄膜的电聚合及其多功能性能
DOI：
10.1016/j.electacta.2017.01.117
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发表时间：
2017-02-20
影响因子：
6.6
通讯作者：
Jiang, Yong
中科院分区：
文献类型：
--
作者：
Gao, Min;Lu, Liying;Jiang, Yong
采用循环伏安法研究了一种新的电聚合方法制备了不同钴纳米粒子负载量的聚吡咯（PPy）聚合物薄膜。通过对纯聚吡咯和聚吡咯纳米复合材料的傅里叶变换红外光谱（FT-IR）和拉曼光谱（Raman）分析，进一步证实了聚吡咯的电聚合机理。PPy/Co PNCs具有独特的多功能特性。首先，它们在室温下是超顺磁体，其饱和磁化强度可以通过改变电解质溶液中Co NPs的浓度来控制。第二，它们不仅表现出半导体输运行为，而且在外加磁场下表现出负磁阻效应。PPy/Co PNCs的介电常数随着频率的增加从负向正转变。聚吡咯纳米复合材料优异的磁学和电学性能使其成为一种很有前途的微波吸收材料。(C)2017爱思唯尔有限公司版权所有
A novel electropolymerization process has been presented to prepare compact polypyrrole (PPy) polymer films embedded with different cobalt nanoparticle (Co NP) loadings by using cyclic voltammetry. An electropolymerization mechanism is suggested and further confirmed by Fourier transform infrared (FT-IR) spectroscopy and Raman spectroscopy of pure PPy and PPy polymer nanocomposites (PNCs). The PPy/Co PNCs exhibit unique multifunctional properties. Firstly, they are superparamagnets at room temperature, whose saturation magnetization can be controlled by modifying the concentration of Co NPs in the electrolyte solution. Secondly, they show not only semiconductor transportation behavior but also a negative rnagnetoresistance under external magnetic field. The permittivity of the PPy/Co PNCs switches from negative to positive with the increasing frequency. Both the outstanding magnetic and electrical properties make the PPy PNCs promising as one kind of microwave absorbing materials. (C) 2017 Elsevier Ltd. All rights reserved.