期刊
ELECTROCHIMICA ACTA
卷 463, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2023.142822
关键词
1-aminopyrene; Multi-walled carbon nanotubes; NADH sensor; Electrocatalysis
Researchers have successfully activated 1-aminopyrene on multi-wall carbon nanotubes and investigated its electrochemical properties for NADH oxidation. The resulting hybrid nanostructure showed reversible redox transitions and was used to modify a glassy carbon electrode. The modified electrode exhibited remarkable electrocatalytic activity for NADH oxidation, providing a sensitive and easy-to-prepare sensor.
We report the electrochemical activation of 1-aminopyrene (1-AP) on the surface of multi-wall carbon nanotubes (MWCNT) and investigated its electrochemical properties for NADH oxidation. Through the electrochemical oxidation, the 1-AP is restructured into a highly electroactive active 1-amino-pyrene-4,5,9,10 tetrol (1-APox) revealing reversible quinone/hydroquinone redox transitions. As a result, the functional hybrid nanostructure was obtained, which was then used to modify the glassy carbon electrode (GC). Atomic force microscopy (AFM) shows that 1-APox uniformly covers the surface of the MWCNT. Mass spectrometry (MS) was applied to confirm the structure of the resultant 1-APox. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) analysis indicates attachment of oxygen group due to electrochemical oxidation. The results obtained by cyclic voltammetry (CV) showed that MWCNT/1-APox revealed good reversibility of the resultant redox couple in aqueous buffered electrolytes. The modified GC/MWCNT/1-APox electrode exhibits remarkable electrocatalytic activity to oxidize NADH at a low potential. A limit of detection (LOD) of 0.08 & mu;M and a limit of quantification (LOQ) of 0.23 & mu;M have been established for an amperometric technique of NADH measurement based on its electrocatalytic approach. High electrocatalytic activity, high sensitivity, and easy preparation are benefits of the sensor.
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