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Electrochemical study of o-toluidine blue impregnated in mesoporous silica channels |
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| Authors: | Martines Marco Antonio Utrera do Carmo Devaney Ribeiro de Castro Gustavo Rocha Caetano Laércio |
| Affiliation: | 1.Departamento de Química, Universidade Federal de Mato Grosso do Sul—UFMS, C.P. 549, Av. Senador Felinto Muller, 1555, Campo Grande, MS, 79070-900, Brazil ;2.Departamento de Física e Química, Faculdade de Engenharia de Ilha Solteira—UNESP, Av. Brasil Centro, 56, C.P. 31, Ilha Solteira, SP, 15385-000, Brazil ;3.Departamento de Química e Bioquímica, Instituto de Biociências—UNESP, C.P. 510, Botucatu, SP, 18618-970, Brazil ; |
| Abstract: | This paper reports an electrochemical study of ordered mesoporous silica impregnated with a cationic dye (o-toluidine blue), prepared with a non-ionic surfactant as the structure-directing agent. O-toluidine blue was chosen because of its utility as an electron transfer mediator (redox catalyst). O-toluidine blue impregnated mesoporous silica was characterized by nitrogen sorption porosimetry, small angle X-ray scattering, infrared spectroscopy, scanning electron microscopy and cyclic voltammetry using chemically modified carbon paste electrodes. Results indicate that the dye is located within the ordered mesopores of micron-sized silica spheres. |
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