resumo
Nanostructures made of titanium dioxide and/or platinum nanoparticles supported on reduced graphene oxide (RGO) were synthesized by a simple and fast microwave-assisted route and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and Raman spectroscopies. The composites consist of RGO sheets fully and homogeneously coated with a dense layer of 8 nm TiO2 and/or 2 nm Pt nanoparticles. Screen-printed flexible sensors based on Pt-TiO2/RGO composites are applied for the amperometric detection of hydrogen peroxide ( H2O2). The electrochemical characteristics of Pt/RGO, TiO2/RGO and Pt-TiO2/RGO-modified screen printed electrodes are investigated and discussed. The developed sensor allows the detection of H2O2, with a linear response from 0 to 20 mm of H2O2 and a sensitivity of 40 mu AmM-1 cm(-2). The resulting device is also suitable for the analysis of this toxic compound in milk.
palavras-chave
HYDROGEN-PEROXIDE REDUCTION; FUNCTIONALIZED GRAPHENE; GRAPHITE OXIDE; NONAQUEOUS SYNTHESIS; MESOPOROUS PLATINUM; FUEL-CELLS; NANOPARTICLES; OXIDATION; NANOSTRUCTURES; BIOSENSOR
categoria
Electrochemistry
autores
Leonardi, SG; Aloisio, D; Donato, N; Russo, PA; Ferro, MC; Pinna, N; Neri, G
nossos autores
Marta Ascenção Carmona Ferro
Técnico de Laboratório
Patrícia Alexandra Ferreira Russo
Bolseiro de pós-DoutoramentoGrupos
Projectos
Nanotubes and Nanowires based hybrid nanostructures (PTDC/CTM/098361/2008)
RMNE-UA-National Network of Electron Microscopy (REDE/1509/RME/2005 )
agradecimentos
P.A.R. and M.C.F. are grateful to the Fundacao para a Ciencia e a Tecnologia (FCT) for financial support (project PTDC/CTM/098361/2008), National Network of Electron Microscopy-University of Aveiro (project REDE/1509/RME/2005 and BPD grant SFRH/BPD/79910/2011).