Journal
MICROCHIMICA ACTA
Volume 183, Issue 6, Pages 2031-2037Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-016-1842-3
Keywords
Carboxylated nanocrystalline cellulose; Poly(3,4-ethylenedioxythiophene); Layer-by-layer; Self-assembly; Anion sensor; Cyclic voltammetry; Differential pulse voltammetry
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Funding
- 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
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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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