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A Sensor Based on Hollow, Octahedral, Cu 2 O‐Supported Palladium Nanoparticles – Prepared by a Galvanic Replacement Reaction – and Carboxylic Multi‐Walled Carbon Nanotubes for Electrochemical Detection of Caffeic Acid in Red Wine
Author(s) -
Hu Bibo,
Zhang Min,
Liu Peng,
Xie Shilei,
Xie Dong,
Wang Shoushan,
Cheng Faliang,
Wang Lishi
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900091
Subject(s) - caffeic acid , nanocomposite , electrochemical gas sensor , detection limit , palladium , electrochemistry , carbon nanotube , nuclear chemistry , galvanic cell , materials science , nanoparticle , electrode , chemistry , inorganic chemistry , catalysis , organic chemistry , nanotechnology , chromatography , antioxidant
A novel nanocomposites prepared from hollow, octahedral cuprous oxide supported palladium nanoparticles (Cu 2 O‐PdNPs) through a facile galvanic replacement reaction and carboxylic multi‐walled carbon nanotubes (MWCNTs‐COOH) was modified on the surface of glassy carbon electrode (Cu 2 O‐PdNPs@MWCNTs‐COOH/GCE) to fabricate a sensor for electrochemical detection of caffeic acid. The synergistic effect between Cu 2 O‐PdNPs and MWCNTs‐COOH exhibited remarkable electrocatalytic activity, higher selectivity and higher sensitivity toward caffeic acid. At optimized test conditions, the Cu 2 O‐PdNPs@MWCNTs‐COOH/GCE nanocomposites sensor revealed wider linear range of 0.006‐60 μM with a lower detection limit of 0.002 μM (S/N=3) for caffeic acid determination. Eventually, the proposed nanocomposites sensor was successfully applied to determine the concentration of caffeic acid in red wine samples.