真空蒸发沉积聚苯胺-TCNQ复合薄膜的STM研究

Scanning Tunneling Microscope Study of Polyaniline-TCNQ Complex Films Deposited by Vacuum Evaporation

利用扫描隧道显微镜（ＳＴＭ）对真空蒸发沉积的聚苯胺－ＴＣＮＱ（ＰＡＮＩ－ＴＣＮＱ）复合薄膜、纯聚苯胺薄膜及纯ＴＣＮＱ 薄膜试样进行了对比分析。研究发现，纯ＰＡＮＩ薄膜和纯ＴＣＮＱ 薄膜都是绝缘膜，而用ＴＣＮＱ 搀杂可获得具有较高导电特性的ＰＡＮＩ－ＴＣＮＱ 复合薄膜。而且与表面粗糙不连续的ＰＡＮＩ薄膜和ＴＣＮＱ薄膜相比，ＰＡＮＩ－ＴＣＮＱ复合薄膜易形成较大面积的表面结构完善的连续膜。傅里叶变换红外光谱（ＦＴＩＲ）分析表明ＰＡＮＩ－ＴＣＮＱ 复合薄膜中的ＰＡＮＩ分子与ＴＣＮＱ分子之间发生了电荷转移。透射电子显微镜（ＴＥＭ）研究发现纯ＰＡＮＩ薄膜是无定形态的薄膜，而ＰＡＮＩ－ＴＣＮＱ却是多晶薄膜。

Different polyaniline thin films, deposited by the vacuum evaporation,were characterized by scanning tunneling microscope(STM). It was found that both the pure PANI and TCNQ thin film are all insulated. Whereas, the PANI TCNQ complex thin films are conductive. The surface of the PANI TCNQ thin films are more uniform and smooth than that of PANI film and TCNQ film. Fourier transform Infrared(FTIR) spectrum showed that there exist charge transfer between the PANI and TCNQ molecules in the film. Transmission electron microscope(TEM) analysis proved that PANI film is amorphous, while PANI TCNQ complex film is polycrystalline.