期刊
RSC ADVANCES
卷 3, 期 31, 页码 12694-12701出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra40973b
关键词
-
资金
- National Natural Science Foundation of China [21003029, 21101041, 21071037, 91122002]
- Postdoctoral Science-research Development Foundation of Heilongjiang Province [LBH-Q11098]
A series of polyaniline (PANI) materials have been prepared by a reverse dropping method with the assistance of polyvinylpyrrolidone (PVP). It can be found that PVP and the dropping rate play critical roles in determining the morphology evolution of PANI, and the restriction of PVP is highly dependent on the dropping rate. Well dispersed PANI nanoparticles can only be obtained under moderate conditions. Thanks to the unique preparative process, these samples show significant changes in the length and oxidation state of conjugated chains, as proved by the results of UV/vis absorption spectra and FT-IR spectra, which result in their distinguishable conductivity and microwave absorption. Very interestingly, PANI nanoparticles exhibit substantially enhanced microwave absorption properties. In particular the optimum one, PANI-NP2, presents very strong reflection loss (-40.5 dB at 5.8 GHz) and wide response bandwidth (3.2-18 GHz over -10 dB), which are indeed comparable to those composites of PANI with various magnetic particles, implying promising applications as a kind of light-weight and highly effective microwave absorber. By systematically investigating the electromagnetic parameters, it can be concluded that suitable complex permittivity, improved characteristic impedance and multiple relaxation processes in PANI nanoparticles should be responsible for their good microwave absorption.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据