A highly sensitive persulfate sensor based on a hybrid nanocomposite with silicomolybdate doping poly(3,4-ethylenedioxythiophene) on multi-walled carbon nanotubes

被引:5
作者
Lin, Kuo Chiang [1 ]
Wu, Tsung Han [1 ]
Chen, Shen Ming [1 ]
机构
[1] Natl Taipei Univ Technol, Dept Chem Engn & Biotechnol, Electroanal & Bioelectrochem Lab, Taipei 106, Taiwan
关键词
MODIFIED ELECTRODE; FILM; OXIDATION; 3,4-ETHYLENEDIOXYTHIOPHENE; PEROXYDISULFATE; BIOSENSOR; AA; UA; DA;
D O I
10.1039/c5ra09009a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel hybrid nanocomposite has been successfully fabricated for persulfate (S2O82-) detection. It can be easily prepared by grafting silicomolybdate (SiMO) and poly(3,4-ethylenedioxythiophene) (PEDOT) on multi-walled carbon nanotubes (MWCNT) to form a SiMO-PEDOT/MWCNT hybrid composite. The SiMO-PEDOT film formation is initiated through the electropolymerization of EDOT monomers. The monomers are firstly electropolymerized to form the positive PEDOT and then the positive polymers are attractive to the negative SiMO, resulting in the electrocodeposition on the electrode surface. It shows three significant redox couples and the redox peak currents can be enhanced by using a MWCNT-modified electrode. Morphological features were studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The electrode shows good activity towards S2O82- reduction with low overpotential (E-pc = 0 V). Amperometric response provides a linear range of 1-3333 M with sensitivity of 2928.9 mu A mM(-1) cm(-2), a detection limit of 1 x 10(-6) M (S/N = 3), and response time of 2.3 s. The SiMO-PEDOT/MWCNT electrode can effectively analyse S2O82- due to its low overpotential, high sensitivity, good stability, fast response, and low cost.
引用
收藏
页码:59946 / 59952
页数:7
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