Copper hexacyanoferrate nanoparticles modified electrodes: A versatile tool for biosensors

Autor(es)

Baioni, Ana P. ^[1] ; Vidotti, Marcio ^[1] ; Fiorito, Pablo A. ^[2] ; de Toressi, Susana I. Cordoba ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil

^[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 622, n. 2, p. 219-224, OCT 15 2008.
• Citações Web of Science: 49

Resumo

Copper hexacyanoferrate nanoparticles of about 30 nm in size have been prepared by the sonochemical irradiation of a mixture of aqueous potassium ferricyanide and copper chloride solutions. The nanoparticles were immobilized onto fluorine doped tin oxide (FTO) electrodes by using the electrostatic deposition layer-by-layer technique (LbL), obtaining electroactive films with electrocatalytic properties towards H2O2 reduction, providing higher currents than those observed for electrodeposited bulk material, even in electrolytes containing NH4+, Na+ and K+. The nanoparticles assembly was used as mediator in a glucose biosensor by immobilizing glucose oxidase enzyme by both, cross-linking and LbL. techniques. Sensitivities obtained were dependent on the immobilization method ranging from 1.23 mu A mmol(-1) L cm(-2) for crosslinking to 0.47 mu A mmol(-1) L cm(-2) for LbL; these values being of the same order than those obtained with electrodes where the amount of enzyme used is much higher. Moreover, the linear concentration range where the biosensors can operate was 10 times higher for electrodes prepared with the LbL immobilization method than with the conventional crosslinking one. (C) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 03/00629-4 - Síntese e caracterização de eletrodos nanoestruturados modificados superficialmente, como materiais eletrocrômicos de alto desempenho
• Beneficiário: Marcio Eduardo Vidotti Miyata
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 01/10989-2 - Nanocompósitos de blendas de polímeros condutores e óxidos de metais de transição
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• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 03/10015-3 - Arranjos organizados de macromoléculas e nanoestruturas para o desenvolvimento de sensores e microbaterias
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático