期刊
ANALYST
卷 138, 期 21, 页码 6296-6300出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3an01067h
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资金
- Department of Science and Technology (DST) under Science and Engineering Research Council Scheme
Unusual electropolymerization of aniline to polyaniline (PANI) in a neutral pH solution has been successfully demonstrated using a multiwalled carbon nanotube (MWCNT) modified gold electrode (Au-MWCNT@PANI(pH7)). The modified electrode showed highly redox active surface confined peaks corresponding to the molecular transitions of leucoemeraldine-emeraldine and emeraldine-pernigraniline in pH 7 phosphate buffered solution (PBS), along with a low capacitance behavior, in contrast to the conventional acidic solution PANI systems. Control experiments in the absence of MWCNTs (i.e., Au/PANI(pH7)) and in an acidic medium, pH 2 (i.e., Au-MWCNT@PANI(pH2)), resulted in nil and poor redox features respectively. The physicochemical characterization of the MWCNT@PANIpH7 film by TEM, Raman spectroscopy, FTIR and UV-Vis revealed the presence of polaron type PANI structures on the MWCNT surface. More interestingly, MWCNT@PANI(pH7) showed a highly selective electrocatalytic signal to ascorbic acid (AA) at a low oxidation potential, - 15 mV vs. Ag/AgCl, without interference from nitrite, uric acid, dopamine, glucose, cysteine and citric acid in pH 7 PBS. Extended flow injection analysis yielded an excellent AA sensing response with a detection limit (signal-to-noise ratio = 3) of 42 nM, which is better than that of the conventional acid assisted MWCNT@PANI(pH2) and MWCNT systems.
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