Electrochemical and electrochromic properties of poly(4,4" dimethoxy 3'-methyl 2,2':5',2" terthiophene)

Journal of the Brazilian Chemical Society

Bruna L. Dias²  Emerson M. Girotto¹  Roberto De Matos¹  Marcos J. L. Santos¹  Marco-a. De Paoli¹  Wilson A. Gazotti² 

[1] ,Universidade Estadual Norte Fluminense Centro de Ciência e Tecnologia Laboratório de Ciências QuímicasCampos dos Goytacazes RJ ,Brazil

关键词: thiophene derivatives;    electrochromic properties;    electro polymerization;    electrochromism;    conducting polymer;   

DOI  :  10.1590/S0103-50532005000500009

来源: SciELO

【 摘 要 】

This work describes the electrochemical, spectroelectrochemical and electrochromic properties of poly(4,4" dimethoxy 3'-methyl 2,2':5',2" terthiophene) thin films. The effect of temperature on the electropolymerization was studied by cyclic voltammetry measured in situ. The temperatures used were -10, 0, 10, 20, and 40 ºC. Results indicate that the electropolymerization temperature directly affect the degree of chain organization. The optical response time for bleaching was 0.8 s and for coloring 0.3 s (for films synthesized at 40 ºC, 60 nm thick). After 1400 electrochromic cycles, the chromatic contrast at 570 nm changes from 31 to 14%. The coloration efficiency was enhanced as a function of redox cycling. This was probably caused by a decrease in the injected charge necessary for the color change, suggesting that the electroactive losses occurring during the cycles are related to sites not responsible for electrochromic contrast.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License