摘要
用溶胶-凝胶法制备了γ-Fe2O3纳米粉料,然后通过原位聚合方法制备了质子酸掺杂的聚苯胺(PANI)/γ-Fe2O3纳米复合材料。对其形貌、微结构以及电导率分别用X射线衍射仪(XRD)、透射电镜(TEM)和四探针法进行了表征,用矢量网络分析仪和傅立叶红外谱仪(FTIR)测试分析了样品的微波、红外吸收特性。发现PANI/5wt%γ-Fe2O3复合材料在7～18GHz频率范围内最大反射式吸波衰减为-25dB,吸波衰减小于-8dB的有效带宽为4.6GHz,比未复合的导电聚苯胺和纳米γ-Fe2O3材料具有更优越的微波吸收性能,但随着γ-Fe2O3的含量分别增加到10%和20%时,复合物的带宽变窄,微波吸收性能下降;另外,PANI/5wt%γ-Fe2O3复合物与纳米γ-Fe2O3材料以及导电聚苯胺相比,红外吸收特性得到了显著增强,在3276cm-1波数附近的透过率仅为17%、1700cm-1～1100cm-1范围内透过率均小于40%。同时对PANI/γ-Fe2O3纳米复合材料的微波和红外吸收机理进行了初步探讨。
γ-Fe2O3 nanoparticles were prepared by sol-gel method, and then the conductive protonated polyaniline （PANI）/γ-Fe2O3nanocomposites were synthesized by in-situ polymerization in the presence of hydrochloric acid （HCI） as the dopant. Its microstructure, morphology and DC conductivity were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM） and 4-probe technique, respectively. The microwave absorption and IR absorption of the samples were measured by vector network analyzer and Fourier transform infrared spectroscopy （FTIR）. It is found that PANI/Swt%γ-Fe2O3nanocomposite exhibits the maximum reflection loss of -25 dB and the -8dB bandwidth of 4.6GHz, which owns lighter weight, higher absorbing efficiency and broader absorption bandwidth compared with pure PANI and pure γ-Fe2O3 powders, whereas, as the content of γ-Fe2O3 increases to 10wt % and 20 wt%, the bandwidth of the composite become narrow and the microwave absorption decreases; moreover, PANI/5wt% γ-Fe2O3 nanocomposite has higher IR absorption than that of the pure PANI and pure γ-Fe2O3, exhibiting a transmittance of 17% near wave number of 3276cm^-1 and the transmittance is below 40% in 1700cm^-1～1100cm^-1. The mechanism of microwave and IR absorption were also discussed.
出处
《磁性材料及器件》
CAS
CSCD
2008年第1期14-17,31,共5页
Journal of Magnetic Materials and Devices
基金
安徽省教育厅自然科学基金资助项目(KJ2007B033)
