Electrochromism of Conducting Polymer Polypyrrole Films and the Elucidation of its Deterioration Mechanism

导电聚合物聚吡咯薄膜的电致变色及其劣化机制的阐明

基本信息

批准号：
07650019
负责人：
SHIRATORI Seimei
金额：
$ 1.41万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Conducting polymers such as polypyrrole are expected to utilize as electrochromic devices, because they change in their electrical conductivity and absorption of light, corresponding to doping and undoping of ions. However, it has been difficult to fit them for practical use, because these polymers are mechanically hard and brittle and they have only a short cycle-life when used repeatedly. In order to overcome the difficulty, it is very effective to clarify the deterioration mechanism of electrochromism of conducting polymers. In this study, the transition of the characteristics of polypyrrole (PPy) films while applying cyclic voltage in electrolyte solution was studied by the microscopic observation with a CCD video camera, a density gradient centrifugation method, and atomic force microscopy (AFM).From this study we conclude as follows. (1) Pin holes were observed in the PPy film with cyclic doping/undoping of electrochrolyte ions. (2) The the number of the pin holes and the total a … More rea of the pin holes were increased as the increase of the cyclic number of the voltage application. (3) The density of PPy films were increased after cyclic doping/undoping of electrochrolyte ions. (4) The surface morphology observed by AFM shows that the grain size of PPy films shrunk after cyclic doping/undoping of electrochrolyte ions. (5) The deterioration of electrochromism appeared on the electrodeposited PPy films was caused by the shrinkage of PPy films during cyclic doping and undoping of electrochrolyte ions.And also, to overcome these defects and to improve their practical performance, we developed a new method of conducting polymer films of good durability ; composite films of Polypyrrolc (PPy) and the Poly vinyl-alcohol (PVA). By using this PPy/PVA composite, we developed a solid-state device of electrochromic display. The device showed color change (black & transparent yellow) more than 2X10<@D15@>D1 times under repeated and alternate application of DC voltages of (]SY.+-。[) 0.9. Less

预计导电聚合物（例如多吡咯）将用作电致色素装置，因为它们会改变其光的电导率和光的痛苦，对应于离子的掺杂和脱落。但是，很难将它们适合实际使用，因为这些聚合物在机械上坚硬且脆性，并且反复使用时仅具有短周期寿命。为了克服困难，阐明导电聚合物的电色素的定义机制非常有效。在这项研究中，通过使用CCD摄像机，密度梯度离心方法和原子力显微镜（AFM），通过微观观察到在电解质溶液中应用环状电压时的特性（PPY）的特征过渡。（1）在PPY膜中观察到销孔，并具有循环掺杂/电离离子的循环掺杂。（2）随着电压施加的循环数量的增加，引脚孔的数量和总a…更多的引脚孔增加。（3）循环掺杂/不适的电染色体离子后，PPY膜的密度增加。（4）AFM观察到的表面形态表明，循环掺杂/不适的电染色体离子的PPY膜的晶粒尺寸缩小了。（5）电沉积的PPY膜出现的定义是由PPY膜在循环掺杂和电染色离子的脱落过程中的收缩而引起的，并且为了克服这些缺陷并改善其实践表现，我们开发了一种良好耐用性的新方法； polypyrolc（PPY）和聚乙烯基醇（PVA）的复合膜。通过使用此PPY/PVA复合材料，我们开发了一种固态的电染料显示器。在重复的DC电压和替代应用（SY。+ - 。[）0.9的DC电压下，显示的颜色更改（黑色和透明黄色）超过2x10 <@d15@> d1次。较少的