Amperometric sensing of nitrite using a glassy carbon electrode modified with a multilayer consisting of carboxylated nanocrystalline cellulose and poly(diallyldimethyl ammonium) ions in a PEDOT host

作者：Xu, Guiyun; Liang, Shaoping; Fan, Jinshi; Sheng, Ge; Luo, Xiliang^*

来源：Microchimica Acta, 2016, 183(6): 2031-2037.

DOI：10.1007/s00604-016-1842-3

• Carboxylated nanocrystalline cellulose
• Poly(3,4-ethylenedioxythiophene)
• Layer-by-layer
• Self-assembly
• Anion sensor
• Cyclic voltammetry
• Differential pulse voltammetry

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.

• 出版日期2016-6
• 单位青岛科技大学