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.
Original language | English |
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Pages (from-to) | 3995-4001 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 55 |
Issue number | 12 |
DOIs | |
Publication status | Published - 30 Apr 2010 |
Keywords
- Cyclic voltammetry
- Diazonium
- Electrochemical grafting
- p-Phenylenediamine
- Silicon