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|Type:||Artigo de periódico|
|Title:||Electrosynthesis and characterization of poly(3-methylthiophene) on different substrates|
De Paoli, MA
|Abstract:||We report on the study of the electropolymerization of 3-methylthiophene onto Pt, p-Si and indium-tin oxide deposited on polyester using quartz crystal microgravimetry, electrochemical and spectroelectrochemical measurements. We observe that potential variation during the galvanostatic electrodeposition is correlated with the nucleation process. The mass variation of poly(3-methylthiophene) is linear with the amount of the electrochemical charge whereas the absorbance variation curve shows two distinct slopes. The latter result has been explained in terms of conjugation length variation during polymer growth. Scanning electron microscopy analysis allowed the detection of morphological changes from a dense and compact structure to an open morphology when the poly(3-methylthiophene) film thickness increases. The roughness of the films did not change considerably with the substrate, as observed by atomic force microscopy, Absorption and photocurrent spectra at different film thicknesses show a shift of the peaks to lower wave lengths when the thickness increased, thus confirming the decrease of mean conjugation length in thicker films.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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