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采用原位聚合法制备了聚苯胺/碳纳米管复合材料,用提拉法使分散于N,N-二甲基甲酰胺(DMF)中的复合材料在玻璃基底上成膜。通过SEM研究了薄膜的表面与截面形貌,其中复合管的直径为70~80nm,聚苯胺包覆层的厚度在30~40nm之间,薄膜厚度在1μm左右,复合材料分布比较均匀;经Raman光谱、UV-Vis吸收光谱分析表明聚苯胺与碳纳米管之间存在相互作用。使用繁用表和自制的接触装置对光照前后薄膜的电导率进行了测试,结果显示无光照时随着碳纳米管含量的增加复合薄膜的电导率从1.6×10-2s/cm增加到了120×10-2s/cm;光照前后的电导率测试表明,复合薄膜在光照条件下发生了光诱导电荷分离现象,光照使复合薄膜的电导率略有提高。
Polyaniline / carbon nanotube composites were prepared by in-situ polymerization. The composite dispersed in N, N-dimethylformamide (DMF) was film-formed on glass substrate by Czochralski method. The surface and cross-sectional morphology of the film were investigated by SEM. The diameter of the composite tube was 70-80nm, the thickness of the polyaniline coating was between 30-40nm, the thickness of the film was about 1μm, and the composite material was uniformly distributed. The Raman Spectra and UV-Vis absorption spectroscopy showed that there was interaction between polyaniline and carbon nanotubes. The electrical conductivity of the films before and after illumination was tested by using a multi-purpose table and a self-made contact device. The results show that with the increase of the content of carbon nanotubes, the electrical conductivity of the film increases from 1.6 × 10-2s / cm to 120 × 10-2s / cm. The electrical conductivity tests before and after illumination showed that the photo induced charge separation phenomenon occurred in the composite film under light irradiation, and the conductivity of the composite film slightly increased with light irradiation.