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通过改进的液相直接沉淀法制备了 2,5 -双(1- 偶氮基- 2 - 羟基 3 萘甲酰基 邻 氯苯胺)唑(AZO)的纳米微粒,并将AZO纳米级颗粒固定在多壁碳纳米管上(MWCNT -AZO)。利用透射电镜、X射线衍射、X射线光电子能谱和紫外-可见光吸收光谱表征了AZO纳米级颗粒和MWCNT- AZO纳米复合体系的结构。以AZO纳米微粒或MWCNT -AZO纳米复合材料作为载流子发生材料,制备单层光电导体,采用光致电压衰减法研究光电导体性能。结果表明,由于纳米尺寸效应,AZO纳米微粒的光电导性能要比本体AZO颗粒好的多。同时发现,相对于本体AZO和 MWCNT/本体AZO复合材料,MWCNT- AZO纳米复合材料表现出更佳的光电导性能和更宽的光谱响应范围,这是MWCNT -AZO纳米复合材料的纳米尺寸效应以及AZO纳米微粒向MWCNT的电荷转移引起的。
The nanoparticles of 2,5 - bis (1 - azo - 2 - hydroxy 3 - naphthoyl o - chloroanilino) azole (AZO) were prepared by the improved liquid - phase direct precipitation method and the AZO nanoparticles were immobilized Multi-walled carbon nanotubes (MWCNT-AZO). The structures of AZO nanosized particles and MWCNT-AZO nanocomposite were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-Vis absorption spectra. Single-layer photoconductors were prepared using AZO nanoparticles or MWCNT-AZO nanocomposites as carrier-generating materials, and the photoconductive properties of the photoconductors were studied by photo-induced voltage decay. The results show that the photoconductivity of AZO nanoparticles is much better than the bulk AZO particles due to the nano-size effect. It has also been found that the MWCNT-AZO nanocomposite exhibits better photoconductivity and a broader spectral response range relative to the bulk AZO and MWCNT / bulk AZO composites, which is the nano-size effect of the MWCNT-AZO nanocomposite and AZO nanoparticles to MWCNT charge transfer caused.