Preparation and amperometric response of carbon and platinum dual-cylinder microelectrodes

✍ Scribed by B.J. Seddon; Chang Fa Wang; Wenfeng Peng; Xueji Zhang

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 796 KB
• Volume: 40
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)00319-v

✦ Synopsis

The design and function of an amperometric dual-microelectrode is communicated which can operate as a collection sensor. The device consists of two individually addressable microelectrodes of parallel cylindrical geometry. Dual-cylinder microelectrodes have been prepared from micrometre platinum wire and carbon fibre to extremely good precision using a microscope fabrication technique. The shielding and feedback properties of the new microelectrode assembly have been evaluated with respect to electrode separation for the case of the hexacyanoferrate (iii)/(ii) couple. Carbon fibre (CF) devices with cylinder length of 585pm are suitable for the cycling of organic redox couples between narrow gap electrodes. A discussion follows reporting the selective sensing of 1,4_dihydroxybenzene at a narrow gap CF device where the chemical and electrochemical effects of ascorbate interferences are largely filtered out to concentrations of 200nM.