The application of multiwalled carbon nanotube/electroactive polyimide Composites modified electrode to the sensing of ascorbic acid

• Main Authors: Cheng-Chung Yao, 姚烝琮
• Other Authors: Jui-Ming Yeh
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/75894036392240285705

碩士 === 中原大學 === 化學研究所 === 101 === Multiwalled carbon nanotube/electroactive polyimide (MWCNT/EPI) composites modified carbon paste electrode (CPE) has been prepared and applied to the electrochemical determination of ascorbic acid (AA). The amino-multiwalled carbon nanotube was functionalized with 4-aminobenzoic acid in mild polyphosphoric acid/Phosphorus pentoxide to obtain 4-aminobenzoyl-functionalized MWCNTs (AF-MWCNTs). The amino functional groups on AF-MWCNTs provided an opportunity to react with oligoaniline in oxidative coupling polymerization. Fourier transform infrared spectra and UV-visible spectra reveal that the quinoid rings on the EPI interact with MWCNTs. The results of the cyclic voltammetry studies indicate enhanced electrochemical properties for efficient electron/charge transfers behaviour of MWCNT/EPI composites. A linear relationship between the concentration of AA added and the change of peak current obtained, as shown by the linear calibration curve of the amperometric response of the CPE modified with MWCNT/EPI sensor to the concentration of AA (R2 = 0.998, n = 15). The limit of quantitation was 13.7 μM and the limit of detection for the MWCNT/EPI-CPE was estimated 4.1 μM at signal/noise (S/N) of 3.