Adsorption and electropolymerization of toluidine blue on the nanostructured octakis(hydridodimethylsiloxy)octasilsesquioxane surface

Toluidine blue O (TBO) was adsorbed on the octakis(hydridodimethylsiloxy)octasilsesquioxane (Q 8M 8 H) surface. The characterization of the precursor (Q 8M 8 H) and resulting materials obtained by the reaction of Q 8M 8 H and toluidine blue (CTBO) were defined using Fourier transform infrared spectr...

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Bibliographic Details
Published in:Materials research bulletin 2008-12, Vol.43 (12), p.3286-3296
Main Authors: do Carmo, Devaney Ribeiro, de Castro, Gustavo Rocha, Martines, Marco Antonio Utrera, Filho, Newton Luiz Dias, Stradiotto, Nelson Ramos
Format: Article
Language:English
Subjects:
A. Composites
A. Nanostructures
ADSORPTION
B. Chemical synthesis
C. Electrochemical measurements
CARBON
D. Electrochemical properties
ELECTROCHEMISTRY
INFRARED SPECTRA
MATERIALS SCIENCE
NANOSTRUCTURES
NUCLEAR MAGNETIC RESONANCE
PH VALUE
POLYMERIZATION
SURFACES
SYNTHESIS
TOLUIDINE BLUE
VOLTAMETRY
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Summary:Toluidine blue O (TBO) was adsorbed on the octakis(hydridodimethylsiloxy)octasilsesquioxane (Q 8M 8 H) surface. The characterization of the precursor (Q 8M 8 H) and resulting materials obtained by the reaction of Q 8M 8 H and toluidine blue (CTBO) were defined using Fourier transform infrared spectra, nuclear magnetic resonance solid-state 13C and Si 29 magic angle spinning. The electrochemical polymerization in a glassy carbon electrode was verified by means of a film silsesquioxane formation (FCTBO) using cyclic voltammetry in a potential range of −0.5 to 1.3 V (vs. saturated calomel electrode (SCE)) in a Britton Robinson (B–R) buffer solution (pH 2.0). The cyclic voltammogram of the film exhibits two redox couples with a formal potential of −0.15 and −0.02 V (B–R buffer pH 5). The formal potential shifts linearly in the cathodic direction by increasing the pH solution with a slope of 71 and 57 mV per unit for the first and second couple, respectively. The film was electrochemically very stable.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2008.02.017