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Improved Electrochemiluminescence Behavior of Glassy Carbon Electrode Through In Situ Chemical Bonding Modification
Author(s) -
Xu Yanxue,
Zheng Baozhan,
Gao Taotao,
Meng Yan,
Yuan Hongyan,
Xiao Dan
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801849
Subject(s) - electrochemiluminescence , glassy carbon , surface modification , molecule , oxidizing agent , electrode , chemical modification , materials science , chemical bond , in situ , carbon fibers , electrochemistry , chemistry , polymer chemistry , organic chemistry , cyclic voltammetry , composite material , composite number
Abstract An in situ chemical bonding method is developed for the electrochemiluminescence (ECL) modification of an oxidized glassy carbon electrode (GCE ox ). Bare GCE has been activated here via fierce oxidizing etching to form GCE ox . GCE ox with numerous cracks and oxygen‐containing groups exhibits a negatively charged surface, which tends to attract and react with the specific molecules to form chemical bonds. An ECL molecule, Ru‐L1, was synthesized and in situ bonded on the GCE ox surface to fabricate Ru‐GCE ox . The proposed chemical bonding modification eliminates the interface resistance to improve the electron transfer rate between Ru‐L1 and the surface of GCE, which has been demonstrated by the better reversibility of Ru‐GCE ox compared to traditional modified GCEs. The improvement of the ECL behavior of Ru‐GCE ox is also confirmed by its lower ECL potential than traditional modified GCEs. Ru‐GCE ox is reusable to respond to α‐naphthol with an ultrahigh sensitivity, owing to its excellent ECL stability and scraping resistance, which decreases the consumption of Ru‐L1. The successful fabrication of Ru‐GCE ox indicates that the method of in situ chemical modification for GCE ox can be applied to fabricate various glassy carbon‐based sensors through coupling with various specific molecules.