Electorchemical Studies of Cytochrome c on Electodes Modified by Single—Wall Carbon Naotubes

Electorchemical Studies of Cytochrome c on Electodes Modified by Single—Wall Carbon

Naotubes

程发良;杜珊;金葆康

【期刊名称】《中国化学：英文版》 【年(卷),期】2003(021)004

【摘要】Single-wall carbon nanotubes(SWNTs) modified gold electrodes were prepared by using two different methods.The electrochemical behavior of cytochrome c on the modified gold electrodes was investigated.The first kind of SWNT-modified electrode (noted as SWNT/Au

electrode)was

prepared

by

the

adsorption

of

carboxylterminated SWNTs from DMF dispersion on the gold electrode.The oxidatively processed SWNT tips were covalently modified by coupling with amines (AET) to form amide linkage.Via Au-S chemical bonding,the self-assembled monolayer of thiol-unctionalized nanotubes on gold surface was fabricated so as to prepare the others SWNT-modified electrode (noted as SWNT/AET/Au electrode).It was shown from cyclic voltammetry cxperiments that cytochrome c exhibited direct electrochemical responses on the both electrodes, but only the current of controlled diffusion existed on the SWNT/Au electrode while both the currents of controlled diffusion and adsorption of cytochrome c occurred on the SWNT/AET/Au electrode.Photoelastic