基于碳纳米管的偶氮纳米复合材料的制备及光电导性能研究(英文)

Preparation and Photoconductivity Study of AZO Nanocomposites Based on Carbon Nanotubes

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。

bis(1'-Azo-2'-hydroxy-3'-naphthoyl-o-chloroanide) oxazole (AZO) nanoparticles and the nanoscale AZO pigments immobilized on the outer shell of multiwalled carbon nanotubes (MWCNT-AZO) were prepared by a modified liquid phase reprecipitation method. The AZO nanoparticles and the MWCNT-AZO hybrid were characterized by means of TEM, XRD, XPS, and UV-Vis absorption. The photoconductivities of single-layered photoreceptors, where MWCNT-AZO hybrid or AZO nanoparticles served as the charge generation material (CGM), were studied by the xerographic photoinduced discharge method. The results showed that the photoconductivity of AZO nanoparticles was improved greatly compared to that of bulk AZO due to nanometer size effect. It was also found that the MWCNT-AZO nano hybrid showed broader and enhanced photosensitivity than MWCNT/bulk azo pigments (AZO) blend or the bulk AZO did, which was interpreted in terms of nanometer size effect of MWCNT-AZO hybrid and charge transfer from AZO nanoparticles to MWCNT.