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Electrochemical Detection of Catechol on Boron‐doped Diamond Electrode Modified with Au/TiO 2 Nanorod Composite
Author(s) -
Wei Min,
Liu Yong,
Gu ZhongZe,
Liu ZhongDong
Publication year - 2011
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201190015
Subject(s) - nanorod , catechol , electrode , electrochemistry , chemistry , diamond , detection limit , composite number , boron , chemical engineering , nanotechnology , nuclear chemistry , inorganic chemistry , materials science , composite material , organic chemistry , chromatography , engineering
Au/TiO 2 nanorod composites with different ratios of [TiO 2 ]:[Au] have been prepared by chemically reducing AuCl 4 ‐ on the positively charged TiO 2 nanorods surface and used to modify boron‐doped diamond (BDD) electrodes. The electrochemical behaviors of catechol on the bare and different Au/TiO 2 nanorod composites‐modified BDD electrodes are studied. The cyclic voltammetric results indicate that these different Au/TiO 2 nanorod composites‐modified BDD electrodes can enhance the electrocatalytic activity toward catechol detection, as compared with the bare BDD electrode. Among these different conditions, the Au/TiO 2 ‐BDD3 electrode (the ratio of [TiO 2 ]:[Au] is 27:1) is the most choice for catechol detection. The electrochemical response dependences of the Au/TiO 2 ‐BDD3 electrode on pH of solution and the applied potential are studied. The detection limit of catechol is found to be about 1.4 × 10 ‐6 M in a linear range from 5 × 10 ‐6 M to 200 × 10 ‐6 M on the Au/TiO 2 ‐BDD3 electrode.