The electrochemical effect of acid functionalisation of carbon nanotubes to be used in sensors development
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
|---|---|
| Data(s) |
20/10/2012
20/10/2012
2011
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| Resumo |
The electrochemical behaviour of multi-walled carbon nanotubes was compared with that of glassy carbon, and the differences were investigated by cyclic voltammetry and electrochemical impedance spectroscopy before and after acid pre-treatment. The electrochemical techniques showed that acid functionalisation significantly improves the electrocatalytic properties of carbon nanotubes. These electrocatalytic properties enhance the analytical signal, shift the oxidation peak potential to a less positive value, and the charge-transfers rate increase of both dopamine and K(4)[Fe(CN)(6)]. The functionalisation step and the resulting appearance of edge planes covered with different chemical groups were confirmed by FTIR measurements. Carbon nanotubes after acid pre-treatment are a potentially powerful analytical tool for sensor development. (C) 2010 Elsevier B.V. All rights reserved. CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) CAPES[0316083] |
| Identificador |
SURFACE SCIENCE, v.605, n.3/Abr, p.435-440, 2011 0039-6028 http://producao.usp.br/handle/BDPI/31646 10.1016/j.susc.2010.11.014 |
| Idioma(s) |
eng |
| Publicador |
ELSEVIER SCIENCE BV |
| Relação |
Surface Science |
| Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
| Palavras-Chave | #Multi-walled carbon nanotubes #Acid pre-treatment #Electrochemical impedance spectroscopy #Infrared absorption spectroscopy #Cyclic voltammetry #DOPED DIAMOND ELECTRODES #ASCORBIC-ACID #DIFFERENT MORPHOLOGIES #DOPAMINE #KINETICS #PURIFICATION #STABILITY #SURFACES #BEHAVIOR #Chemistry, Physical #Physics, Condensed Matter |
| Tipo |
article original article publishedVersion |
