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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)|
De Matos R.
De Paoli M.-A.
|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°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°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. ©2005 Sociedade Brasileira de Química.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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