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

诸如聚吡咯之类的导电聚合物有望用作电致变色器件，因为它们的电导率和光吸收率会随着离子的掺杂和去掺杂而变化。为了克服这一困难，阐明导电聚合物电致变色的劣化机理非常有效。通过使用CCD摄像机的显微观察、密度梯度离心法和原子力显微镜(AFM)研究了在电解质溶液中施加循环电压时聚吡咯(PPy)膜的特性。从这项研究中我们得出以下结论1。 ) 在电解铬离子的循环掺杂/去掺杂的 PPy 薄膜中观察到针孔 (2) 针孔的数量和针的总面积。 (3)电铬离子循环掺杂/去掺杂后，PPy薄膜的密度增加。(4)AFM观察的表面形貌表明PPy晶粒尺寸增大。 (5)电沉积PPy薄膜出现电致变色劣化是由于PPy收缩造成的同时，为了克服这些缺陷并提高其实际性能，我们开发了一种具有良好耐久性的导电聚合物薄膜的新方法；聚吡咯（PPy）和聚乙烯醇复合薄膜；通过使用这种PPy/PVA复合材料，我们开发了一种固态电致变色器件，该器件显示出超过100种颜色变化（黑色和透明黄色）。重复交替施加(]SY.+-直流电压2X10<@D15@>D1次。 [) 0.9。