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

Journal of the Brazilian Chemical Society

Santos, Marcos J. L.¹  Universidade Estadual Norte Fluminense, Campos dos Goytacazes, Brazil¹  Dias, Bruna L.¹  Universidade Estadual de Campinas, Campinas, Brazil¹  Universidade Estadual de Maringá, Maringá, Brazil¹  Girotto, Emerson M.¹  Matos, Roberto de¹  De Paoli, Marco-A.¹  Gazotti, Wilson A.¹ 

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

DOI  :  10.1590/S0103-50532005000500009

学科分类：化学（综合）

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】

Unknown