SiO2/TiO2/Sb2O5/graphite carbon ceramic conducting material: preparation, characterization, and its use as an electrochemical sensor

Author(s)

Maroneze, Camila M. ^[1] ; Luz, Rita C. S. ^[1] ; Landers, Richard ^[2] ; Gushikem, Yoshitaka ^[1]

Affiliation

^[1] Univ Estadual Campinas, Inst Quim, BR-13084971 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13084971 Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Solid State Electrochemistry; v. 14, n. 1, p. 115-121, JAN 2010.
• Web of Science Citations: 7

Abstract

SiO(2)/TiO(2)/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. (AU)

• FAPESP's process: 00/11103-5 - Porous materials: preparation, properties and applications
• Grantee: Yoshitaka Gushikem
• Support Opportunities: Research Projects - Thematic Grants