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Type: Artigo de periódico
Title: Electrochemical and electrochromic properties of poly(4,4 '' dimethoxy 3 ' methyl 2,2 ': 5 ',2 '' terthiophene)
Author: Dias, BL
Girotto, EM
de Matos, R
Santos, MJL
De Paoli, MA
Gazotti, WA
Abstract: 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 degrees C. 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 degrees C, 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.
Subject: thiophene derivatives
electrochromic properties
electro polymerization
conducting polymer
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Journal Of The Brazilian Chemical Society. Soc Brasileira Quimica, v. 16, n. 4, n. 733, n. 738, 2005.
Rights: aberto
Identifier DOI: 10.1590/S0103-50532005000500009
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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