Document Detail

Electrochemical detection of amino acids at carbon nanotube and nickel-carbon nanotube modified electrodes.
MedLine Citation:
PMID:  15508037     Owner:  NLM     Status:  MEDLINE    
The oxidation and enhanced detection of traditionally 'non-electroactive' amino acids at a single-wall carbon nanotube (SWNT) surface and at a nickel hydroxide film electrochemically deposited and generated upon the SWNT layer is reported. Different CNT are compared, with Nafion-dispersed SWNT offering the most favorable layer for constant-potential amperometric detection. Factors affecting the oxidation process, including the pH or applied potential, are assessed. The response of the SWNT-Nafion coated electrode compares favorably with that of copper and nickel disk electrodes under flow injection analysis (FIA) conditions. The electrodeposition of nickel onto the SWNT-Nafion layer (Ni-CNT) led to a dramatic enhancement of the analytical response (vs. that observed at the SWNT or nickel electrodes alone). The oxidative process at the Ni(OH)(2) layer has been studied and the increase in sensitivity rationalized. In the presence of amino acid the Ni-CNT layer undergoes an electrocatalytic process in which the amino acid reduces the newly formed NiO(OH) species. Furthermore, the attractive response of both the CNT and Ni-CNT layers has allowed these electrodes to be used for constant-potential FIA of various amino acids and indicates great promise for monitoring chromatographic effluents. Once again an improved signal was observed at the Ni-CNT electrode compared to nickel deposited upon a bare glassy carbon electrode (Ni-GC).
Randhir P Deo; Nathan S Lawrence; Joseph Wang
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2004-08-13
Journal Detail:
Title:  The Analyst     Volume:  129     ISSN:  0003-2654     ISO Abbreviation:  Analyst     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-10-27     Completed Date:  2005-02-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  England    
Other Details:
Languages:  eng     Pagination:  1076-81     Citation Subset:  IM    
Department of Chemistry, New Mexico State University, New Mexico 88003, USA.
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MeSH Terms
Amino Acids / analysis*
Nanotubes, Carbon*
Reg. No./Substance:
0/Amino Acids; 0/Nanotubes, Carbon; 7440-02-0/Nickel

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