Methylene Blue/Multiwall Carbon Nanotube Modified Electrode for the Amperometric Determination of Hydrogen Peroxide |
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| Authors: | Roselyn C Peña Mauro Bertotti Christopher M A Brett |
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| Institution: | 1. Instituto de Química, Universidade de S?o Paulo, 05508‐900 S?o Paulo, Brasil;2. Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004‐535 Coimbra, Portugal, Tel/fax: +351–239835295 |
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| Abstract: | A novel amperometric sensor based on the incorporation of multiwalled carbon nanotubes (MWCNT) into a poly(methylene blue) (PMB) film immobilized on carbon composite electrodes is described. Cyclic voltammetry indicated that at a surface covered by a MWCNT/PMB layer the cathodic reduction of hydrogen peroxide is facilitated and occurs already at 0.0 V versus SCE. The effect of the order of deposition of PMB and MWCNT, as well as its loading, on electrochemical behaviour was evaluated by cyclic voltammetry and electrochemical impedance spectroscopy. The influence of the various immobilised platforms on the electrocatalytic performance towards hydrogen peroxide was also examined. |
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| Keywords: | Multiwalled carbon nanotubes Poly(methylene blue) Hydrogen peroxide Modified electrode |
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