期刊
MICROCHIMICA ACTA
卷 183, 期 6, 页码 2031-2037出版社
SPRINGER WIEN
DOI: 10.1007/s00604-016-1842-3
关键词
Carboxylated nanocrystalline cellulose; Poly(3,4-ethylenedioxythiophene); Layer-by-layer; Self-assembly; Anion sensor; Cyclic voltammetry; Differential pulse voltammetry
资金
- National Natural Science Foundation of China [21422504, 21275087]
- Natural Science Foundation of Shandong Province of China [JQ201406]
- Taishan Scholar Program of Shandong Province of China
- Domestic Visiting Scholar Program of Shandong Province of China for Young Backbone Teachers of Colleges and Universities
Negatively charged carboxylated nanocrystalline cellulose (CNCC) and positively charged poly(diallyldimethyl ammonium chloride) (PDDA) were alternatingly assembled on the surface of a glassy carbon electrode to form a relatively uniform polyelectrolyte multilayer nanocomposite (CNCC/PDDA)(n). It was then incorporated into a matrix of conducting poly(3,4-ethylenedioxythiophene) (PEDOT) electrodeposited on the surface of the electrode. The nanocomposites were prepared in various ratios of PEDOT and (CNCC/PDDA), and then characterized by transmission electron microscopy, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. The PEDOT/(CNCC/PDDA)(4) nanocomposite showed the lowest electrochemical impedance and best electrocatalytic activity towards the oxidation of nitrite. Based on these findings, an amperometric sensor was developed which, if operated at 0.80 V (vs. SCE), can detect nitrite in the 0.2 mu M to 1.73 mM concentration range with a 57 nM detection limit.
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