摘   要:在本论文中，我们通过对3,4二氧乙烯噻吩:聚苯乙烯磺酸（PEDOT:PSS）掺入不同体积分数的氯铂酸（H2PtCl6），实现了对PEDOT:PSS薄膜的铂纳米颗粒掺杂，研究了铂纳米颗粒对PEDOT:PSS薄膜导电性和功函数的影响。

我们通过溶液旋涂的方法制备了PEDOT:PSS（掺杂）薄膜。通过使用四探针测量法测量PEDOT:PSS（掺杂）薄膜的导电率，我们发现随着Pt纳米颗粒掺杂浓度的增加，PEDOT:PSS薄膜的导电率呈现下降趋势。PEDOT:PSS薄膜导电率下降的原因是：Pt纳米颗粒掺杂破坏了PEDOT:PSS分子排列规则，使正常的导电通道受到阻碍，由此导致导电率下降；Pt纳米颗粒掺杂增强了PEDOT:PSS薄膜表面的粗糙度也是导电率下降的一个原因。掺杂前后PEDOT:PSS薄膜的扫描电子显微镜（SEM）图像显示，掺杂到PEDOT:PSS薄膜中的Pt纳米颗粒直径大约为200 nm，且随着掺杂浓度的增大，薄膜愈加粗糙。为了研究掺杂后PEDOT:PSS薄膜功函数的变化，我们利用扫描开尔文探针显微镜技术表征掺入不同浓度的铂纳米颗粒后，PEDOT:PSS薄膜功函数的变化。通过分析测量数据，我们发现随着Pt纳米颗粒掺杂浓度的增加，PEDOT:PSS薄膜的功函数先增大再略微减小，然后继续增大。功函数增加的原因归纳为两点，其一是掺杂进薄膜的金属Pt颗粒的功函数较高，其二是随着Pt纳米颗粒的形成，掺杂膜中的PSS单元密度随之增加，薄膜的功函数也就随之变大。随后我们对掺杂前后的PEDOT:PSS薄膜进行了XRD和吸收光谱的测量，测量结果为第二种原因提供了有力的证据。

关键词：3,4二氧乙烯噻吩:聚苯乙烯磺酸（PEDOT:PSS），铂纳米颗粒，导电率，功函数

Abstract:In this paper, platinum nanoparticles of PEDOT: PSS films were prepared by incorporating different volume fraction of chloroplatinic acid (H2PtCl6) into 3,4-dioxinyaphthalene: polystyrene sulfonic acid (PEDOT: PSS). The effects of platinum nanoparticles on the conductivity and work function of PEDOT: PSS films were investigated.

We prepared PEDOT: PSS films by solution spin coating. The conductivity of films was measured by using four probe measurements. We found that the conductivity of films showed a decreasing tendency. The reason for the decrease of conductivity is that Pt nanoparticle doping destroys the PEDOT: PSS molecular arrangement rule, and the normal conductive channel is obstructed, which leads to the decrease of conductivity. Pt nanoparticle doping enhances the surface roughness of the PEDOT: PSS film is also a reason for the decrease in conductivity. The SEM images of films show that the diameter of Pt nanoparticles doped with PEDOT: PSS films is about 200 nm, and the thickness of the films increases with the increase of doping concentration. In order to study the change of the work function of films after doping, we used the scanning Kelvin probe microscope to characterize the change of the work function of films after mixing different concentrations of platinum nanoparticles. By analyzing the measured data, we found that with the increase of Pt nanoparticle doping concentration, the work function of film increased first and then decreased slightly, and then continued to increase. The reason for the increase of the function is summarized as two points, one is the higher the work function of the metal Pt particles doped into the thin film, and the other is that the density of the PSS unit in the doped film increases with the formation of Pt nanoparticles. Then we measured the XRD and absorption spectra of PEDOT: PSS films before and after doping, and the results provided strong evidence for the second reason.

Key words: 3,4-dioxylenethiophene: polystyrene sulfonic acid (PEDOT: PSS), platinum nanoparticles, conductivity, work function

目录

第一章 绪论 1

1.1 导电聚合物 1

1.1.1导电聚合物的发现与发展 1

1.1.2导电聚合物的分类与特点 1