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Electrochemical Behavior of Caffeic Acid Assayed with Gold Nanoparticles/Graphene Nanosheets Modified Glassy Carbon Electrode
Author(s) -
Zhang Yanli,
Liu Yanpei,
He Jiemei,
Pang Pengfei,
Gao Yuntao,
Hu Qiufen
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200587
Subject(s) - caffeic acid , graphene , electrochemistry , nanosheet , cyclic voltammetry , electrode , materials science , electrochemical gas sensor , nanocomposite , detection limit , colloidal gold , glassy carbon , biosensor , electron transfer , nanoparticle , nuclear chemistry , chemical engineering , chemistry , nanotechnology , chromatography , organic chemistry , antioxidant , engineering
Abstract A gold nanoparticle (AuNP) and graphene nanosheet (GN) modified glassy carbon electrode (GCE) is proposed as voltammetric sensor for caffeic acid assay. The sensor exhibits a surface‐confined and reversible process for oxidation of caffeic acid revealed by cyclic voltammetry. The results show more favorable electron transfer kinetics than the bare GCE. The linear response of the sensor is from 5×10 −7 to 5×10 −5 M with a detection limit of 5×10 −8 M ( S/N =3). The AuNP/GN nanocomposite shows more favorable electrochemical activity and should be a kind of more robust and advanced functional material, which provides a promising platform for electrochemical sensors and biosensors. The method was successfully applied to detect caffeic acid in pharmaceutical tablets with satisfactory results.