Artículos de revistas
SiO2/TiO2/Sb2O5/graphite carbon ceramic conducting material: preparation, characterization, and its use as an electrochemical sensor
Registro en:
Journal Of Solid State Electrochemistry. Springer, v. 14, n. 1, n. 115, n. 121, 2010.
1432-8488
WOS:000271107600015
10.1007/s10008-009-0796-3
Autor
Maroneze, CM
Luz, RCS
Landers, R
Gushikem, Y
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) SiO2/TiO2/graphite (STG) electrically conducting material, prepared by the sol-gel processing method, was used as substrate base for the chemical immobilization of Sb(V) by formation of the Ti-O-Sb linkage. The surface modified material, STGSb, was characterized by X-ray photoelectron spectroscopy and scanning electronic microscopy coupled to energy dispersive spectroscopy. The results showed the Sb(V) homogeneously dispersed on the STG matrix surface, with no phase segregation or isolated pure oxide domains. An electrode prepared with the STGSb material was used to adsorb the electroactive cationic dye meldola blue. The modified electrode, STGSb/MB, presented good performance toward electrocatalytic oxidation of the coenzyme beta-NADH (nicotinamide adenine dinucleotide). The electrode was shown to be very stable and allowed the electrochemical detection of NADH at low electrode potential (-0.14 V), which is an interesting feature of the system since in this potential range it is possible to minimize surface fouling and electrode passivation. The support material (STGSb) has proven to have great potential to be applied in the construction of various new electrochemical sensors based on cationic dyes presenting redox properties. 14 1 115 121 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) YG [00/11103-5] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) YG [00/11103-5]