Chemically immobilised carbon nanotubes on silicon : stable surfaces for aqueous electrochemistry

Flavel, BS, Garrett, DJ, Lehr, J ORCID: https://orcid.org/0000-0001-5698-7244, Shapter, JG and Downard, AJ 2010, 'Chemically immobilised carbon nanotubes on silicon : stable surfaces for aqueous electrochemistry' , Electrochimica Acta, 55 (12) , pp. 3995-4001.

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Abstract

Diazonium ion chemistry has been used to electrochemically graft aminophenyl layers onto p-type silicon (1 0 0) substrates. A condensation reaction was used to immobilise single-walled carbon nanotubes with high carboxylic acid functionality directly to this layer. Electrochemical monitoring of the aminophenyl groups confirmed the formation of an amide linkage between the single-walled carbon nanotubes and the aminophenyl layer. The carbon nanotube electrode showed high stability and good electrochemical performance in aqueous solution. At moderate scan rates the Ru(NH3)6+3/+2 couple exhibited quasi-reversible electron transfer kinetics with a standard heterogenous rate constant of 1.2 × 10−3 cm s−1 at the covalently-linked carbon nanotube surface. The electrode thus combines the advantages of a silicon substrate for easy integration into sophisticated electrical and electronic devices, carbon nanotubes for desirable electrochemical properties, and stability in aqueous medium for future applications in environmental sensing.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering
Journal or Publication Title: Electrochimica Acta
Publisher: Elsevier
ISSN: 0013-4686
Related URLs:
Depositing User: J Lehr
Date Deposited: 11 Aug 2021 11:43
Last Modified: 27 Aug 2021 21:20
URI: http://usir.salford.ac.uk/id/eprint/50523

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