Wu Y, Hu S. The fabrication of a colloidal gold–carbon nanotubes composite film on a gold electrode and its application for the determination of cytochrome c.
Colloids Surf B Biointerfaces 2005;
41:299-304. [PMID:
15748825 DOI:
10.1016/j.colsurfb.2004.12.019]
[Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2004] [Accepted: 12/01/2004] [Indexed: 10/25/2022]
Abstract
Colloid Au (Au(nano)) with a diameter of about 20 nm was prepared and used in combination with the multi-wall carbon nanotubes (MWNTs) to modify a gold electrode. Dihexadecylphosphate (DHP) dispersed in Au(nano) aqueous solution was used to solubilize MWNTs. Deposition of Au(nano) on MWNTs was realized as illustrated by TEM micrographs. The DHP formed a network that connected Au(nano) and MWNTs to the gold electrode surface. The Au(nano)-MWNTs-DHP composite film on the gold electrode surface was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammmetry (CV). The composite film modified gold electrode was used to detect cytochrome c and a pair of well-defined redox waves was obtained. It was found that the composite film promoted the redox of horse heart cytochrome c and its effect was developed for the determination of cytochrome c.
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