| Summary: | 碩士 === 國立高雄大學 === 化學工程及材料工程學系碩士班 === 98 === In this study, 3-methylthiophene (3MT) was electrochemically polymerized on the carbon nanotube (CNT)/Nafion® composite-modified ITO electrode to form poly(3-methylthiophene) (P3MT) for uses in electrochromic device and sensing device. Thickness of the P3MT film was found to increase with increasing CNT content in the composite film via cyclic voltammetric analysis. For single-layer electrochromic device, color of the P3MT film was found to change from light red to deep blue for voltage change from -2V to 2V. The composite-modified electrode containing 0.03 wt% CNT exhibited a color change at 1 V. In long-term stability test, the maximum optical attenuation (△T%) at 502 nm was 18% and the △T remained 77.2% after 100 repeated cycles. Since poly(3,4-ethylenedioxythiophene) (PEDOT) is an ideal cathodic electrochromic material known for its high electrochromic properties, PEDOT was used with P3MT to make dual-layer electrochromic device. The composite-modified ITO electrode containing 0.03 wt% CNT and coating with P3MT by 30 mC exhibited 34.5% transmittance at λmax 670nm and, in long-term stability test, the △T remained 85.7% after 100 repeated cycles. For sensing device, the results found that, in the composite-modified electrode combining the advantages of poly(3-methylthiophene), CNT with Nafion exhibited dramatic electrocatalytic effect on the oxidation of dopamine (DA) and uric acid (UA) leading to a significant enhancement of the current response. Moreover, the interferences of ascorbic acid (AA) were effectively diminished. This composite-modified ITO electrode could thus be applied to the determination of DA and UA in the presence of AA.
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