分级结构聚苯胺/多壁碳纳米管纳米复合物的制备、表征及其气敏性能研究

Hierarchical PANI/MWCNT Nanocomposite:Synthesis,Characterization and Gas Sensing Properties

采用简单的阳离子表面活性剂诱导原位聚合方法制备了具有针状结构的聚苯胺(PANI)包覆多壁碳纳米管(MWCNTs)的分级结构材料.分别采用红外光谱(FT-IR)、紫外可见(UV-Vis)、扫描电镜(SEM)、透射电镜(TEM)、热重(TG)、气敏测试等分析测试手段对PANI/MWCNT的组成、形貌、微观结构、热稳定性和气敏性能进行了表征和测试.结果表明,在MWCNTs上均匀包覆了约20nm厚的针状PANI,该材料制备的气敏元件在室温下对NH3的灵敏度,重复性明显好于纯PANI,灵敏度也高于非针状PANI包覆的PANI/MWCNT.

Hierarchical polyaniline/multiwalled carbon nanotube（MWCNT） nanocables was synthesized by in-situ chemical polymerization directed by cationic surfactant cetyltrimethylammonium bromide（CTAB）.Morphological and structural characteristics,gas-sensing properties,as well as thermal stability of the hybrid nanocomposites were characterized by using various techniques,including Fourier transform infrared spectroscope（FT-IR）,UV-Visible absorption spectrum（UV-Vis）,scanning electron microscope（SEM）,transmission electronmicroscope（TEM）,thermogravimetric analyzer and gas-sensing measurement.The results indicate that the as-prepared PANI/MWCNT is uniform with 20nm thick needle-like PANI shell.The sensors based on PANI/MWCNT nanocomposites and pure PANI are tested for ammonia gas.Compared with the reported PANI/MWCNT without needle-like PANI,the as-prepared PANI/MWCNT nanocomposites sensors have higher sensitivity and repeatability,and better response/reproducibility towards ammonia at room temperature and also exhibits the higher sensitivity.