Multilayer Assemblies of Tungstodiphosphate Anions on 1,7-Diaminoheptane Modified Glassy Carbon Electrode and the Electrocatalytic Reduction to Iodate

✍ Scribed by Jianyun Liu; Long Cheng; Baifeng Liu; Shaojun Dong

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 124 KB
• Volume: 13
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/1521-4109(200108)13:12<993::aid-elan993>3.0.co;2-w

✦ Synopsis

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 6À 62 and small molecule, Ru(NH 3 ) 3þ 6 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 6À 62 multilayers exhibit high electrocatalytic response and sensitivity towards the reduction of iodate. With the increase of the number of P 2 W 18 O 6À 62 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 6À 62 with satisfactory results. The multilayer electrode is promising as an electrochemical sensor for the detection of trace iodate.