NDLI: Electrochemical quartz crystal microbalance study on growth and property of the polymer deposit at gold electrodes during oxidation of dopamine in aqueous solutions

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Electrochemical quartz crystal microbalance study on growth and property of the polymer deposit at gold electrodes during oxidation of dopamine in aqueous solutions

Content Provider	Semantic Scholar
Author	Li, Yunlong Liu, Meiling Xiang, Canhui Xie, Qingji Yao, Shouzhuo
Copyright Year	2006
Abstract	Polymer growth at Au electrodes during cyclic voltammetric oxidation of dopamine (DA) in aqueous solutions was investigated as functions of DA concentration, solution pH and potential-sweep rate with the use of electrochemical quartz crystal microbalance technique. When the DA concentration was 2 � 10 � 4 M or above and the solution pH was 3.86 or above, the intramolecular cyclization of the first-step oxidation product of DA occurred significantly and further isomerization and oxidation of the cyclization product led to polymer growth at an Au electrode. An ECECEE mechanism for DA oxidation and subsequent polymerization of the oxidation product (5,6-indolequinone) at favorable pH is suggested. The poly(indole)-like polymerization pathway was acceptably supported by comparative minigrid-electrode experiments via Fourier transform infrared characterization of poly(indole) and the polymer from DA oxidation. The quasi first-order rate constant of the intramolecular cyclization was estimated at several pH values by cyclic voltammety. It was also found that the intramolecular cyclization and subsequent polymer deposition at the electrode can be notably inhibited by using various high-concentration supporting electrolytes, with inhibition sequences as
Starting Page	270
Ending Page	278
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1016/j.tsf.2005.10.048
Volume Number	497
Alternate Webpage(s)	http://hgxy.hunnu.edu.cn/UploadFile/20061116102719721.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.tsf.2005.10.048
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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