改性溶胶包覆法制备聚苯胺/TiO_2-Fe_3O_4纳米复合物及吸波性能研究  

Study on Microwave Absorbing Properties of Nanocomposites Polyaniline/TiO_2-Fe_3O_4 Synthesized by Modified Sol-Coated Method

作　　者：王洪波[1] 杨春明[1] 蒋军军[1] 刘小华[1] 李龙浩[1] 杨娟[1] 

机构地区：[1]湖南师范大学化学化工学院,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2013年第2期49-55,共7页Journal of Natural Science of Hunan Normal University

基　　金：湖南省科技计划重点资助项目(2011GK2014);湖南省自然科学基金资助项目(06JJ4007);湖南师范大学大学生开放实验项目(043-0094)

摘　　要：通过改性溶胶法制备了Fe3O4纳米粒子均匀弥散于TiO2中的TiO2-Fe3O4二元纳米复合物,再在不同pH条件下原位聚合生长聚苯胺(PAn),获得了三元包覆纳米复合物PAn/TiO2-Fe3O4.采用透射电镜(TEM)、红外光谱(FT-IR)、粉末X-射线衍射(XRD)及电磁测量等手段对TiO2-Fe3O4和PAn/TiO2-Fe3O4的形貌、结构及性能进行了表征.实验结果表明,通过调节TiO2溶胶形成及包覆过程温度、介质pH值,能获得Fe3O4纳米粒子均匀弥散于TiO2中的二元纳米复合物,且其中TiO2为锐钛矿结构,Fe3O4为立方晶系,而形成的三元复合物PAn/TiO2-Fe3O4则呈现微米纤维结构.当三元复合物中Fe3O4和TiO2的的质量分数分别为6.4%和15.8%时,PAn/TiO2-Fe3O4在13.6 GHz处具有最大的反射损耗-36.4 dB,小于-10 dB的吸收带宽达到4.4 GHz,具有良好的吸波性能.Ternary nanocomposites polyaniline/TiO2Fe3O4 were prepared in different pH conditions by insitugrowth of polyaniline（PAn） on binary TiO2Fe3O4 nanocomposites, which were synthesized via modified solcoated method with Fe3O4 uniformly dispersed in TiO2 nanoparticles. The micrographs, structure and electromagnetic properties of TiO2Fe3O4 and PAn/TiO2Fe3O4 were characterized by TEM, FT-IR, XRD and electromagnetic measurements. Experimental results show that ordered TiO2Fe3O4 nanospheres can be obtained by coating anatase TiO2 on the outer surface of cubic crystal Fe3O4 ferrofluid via adjusting both the temperature of TiO2 sol formation and subsequent coating process, and the pH value of the medium. Whereas the resulting ternary nanocomposites PAn/TiO2-Fe3O4 were in a nanofiber structure. A maximum reflection loss of -36.4 dB and bandwidth of 44 GHz were observed at 13.6 GHz for PAn/TiO2Fe3O4 composites with a mass ratio of 6.4 wt% Fe3O4 and 15.8 wt% TiO2. The nanocomposite exhibits excellent microwave absorbing capacity. 

关 键 词：纳米复合物 改性溶胶包覆法 聚苯胺 TiO2-Fe3O4 吸波性能 

分 类 号：O631[理学—高分子化学] TB383.1[理学—化学]