聚苯胺
材料科学
纳米复合材料
X射线光电子能谱
化学工程
电介质
聚苯胺纳米纤维
结晶度
分析化学(期刊)
纳米技术
复合材料
化学
有机化学
聚合物
聚合
工程类
光电子学
作者
Tar‐Hwa Hsieh,Ko‐Shan Ho,Ching-Hung Huang,Yen‐Zen Wang,Zhilong Chen
出处
期刊:Synthetic Metals
[Elsevier]
日期:2006-12-01
卷期号:156 (21-24): 1355-1361
被引量:29
标识
DOI:10.1016/j.synthmet.2006.10.005
摘要
This article is to carry out researches on the synthesis of the polyaniline/γ-Fe2O3 nanocomposites by a reverse micelle process and the effects of re-doping time on the electromagnetic properties of polyaniline/γ-Fe2O3 nanocomposites, investigated by Fourier transform spectrometer (FT-IR), X-ray photoelectron spectroscopy (XPS), wide angle X-ray diffraction diffractometer (WAXD), impedance analyzer, micro-ohmeter, and superconductor quantum interference device (SQUID). The nanostructure of the polyaniline/γ-Fe2O3 nanocomposites was characterized by micrographs of transmission electron microscopy (TEM). It was found that the dispersed γ-Fe2O3 phase is roughly distributed in the polyaniline matrix. Results showed that, in the presence of γ-Fe2O3, the growth rate of quinoid ring is markedly retarded. The crystallinity and doping level of polyaniline in the nanocomposites increase with re-doping time, the conductivity and dielectric properties (i.e., permittivity and loss factor) of nanocomposites are hence increased and the ionic polarization relaxation time become shorter from 1.71 × 10−9 to 7.48 × 10−10 s. The particle size and γ-Fe2O3 content in the nanocomposites decrease with re-doping time due to the reduction effect resulting from the doped protonic acid of polyaniline. For the room-temperature SQUID analysis, the superparamagnetic behavior is observed, suggesting the presence of the thermal activation energy contribution to the magnetic moment. The saturated magnetization was decreased with decreasing γ-Fe2O3 contents.
科研通智能强力驱动
Strongly Powered by AbleSci AI