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Multilayer Assemblies of Tungstodiphosphate Anions on 1,7‐Diaminoheptane Modified Glassy Carbon Electrode and the Electrocatalytic Reduction to Iodate
Author(s) -
Liu Jianyun,
Cheng Long,
Liu Baifeng,
Dong Shaojun
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200108)13:12<993::aid-elan993>3.0.co;2-w
Subject(s) - iodate , cyclic voltammetry , inorganic chemistry , electrode , electrochemistry , glassy carbon , chemistry , chemically modified electrode , monolayer , catalysis , x ray photoelectron spectroscopy , materials science , reference electrode , chemical engineering , iodide , nanotechnology , organic chemistry , engineering
1,7‐Diaminoheptane (DAH) had been covalently grafted on glassy carbon electrode by amino cation radical formation, which resulted in a stable cationic monolayer under proper pH conditions. Dawson‐type tungstodiphosphate anion, P 2 W 18 O 62 6– and small molecule, Ru(NH 3 ) 6 3 + were alternately assembled on the DAH modified electrode through layer‐by‐layer electrostatic interaction. Thus‐prepared multilayer film had been characterized by cyclic voltammetry and X‐ray photoelectron spectroscopy. The P 2 W 18 O 62 6– multilayers exhibit high electrocatalytic response and sensitivity towards the reduction of iodate. With the increase of the number of P 2 W 18 O 62 6– layers, the catalytic current was enhanced and the catalytic potential shifted positively. Iodate in table salt was determined at the modified electrode containing three layers of P 2 W 18 O 62 6– with satisfactory results. The multilayer electrode is promising as an electrochemical sensor for the detection of trace iodate.