Detection of the neurotransmitter dopamine by a glassy carbon electrode modified with self-assembled perovskite LaFeO3 microspheres made up of nanospheres

Autor(es)

Thirumalairajan, S. ^{[1, 2]} ; Girija, K. ^{[2, 3]} ; Mastelaro, Valmor R. ^[1] ; Ganesh, V. ^[4] ; Ponpandian, N. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP - Brazil

^[2] Bharathiar Univ, Dept Nanosci & Technol, Coimbatore 641046, Tamil Nadu - India

^[3] Dr NGP Inst Technol, Dept Sci & Humanities, Coimbatore 641048, Tamil Nadu - India

^[4] CSIR CECRI, Cent Electrochem Res Inst, Electrod & Elect Catalysis Div, Karaikkudi 630006, Tamil Nadu - India

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 4, n. 49, p. 25957-25962, 2014.
• Citações Web of Science: 14

Resumo

In this paper we report the detection of the neurotransmitter dopamine by an LaFeO3 microsphere-modified electrode in which the microspheres are made up of nanospheres. The morphology, structure and composition of the prepared nanostructure were characterized using SEM, TEM, XRD and XPS, and the electrocatalytic properties were investigated using cyclic voltammetry and amperometric studies. The modified electrodes markedly increased the efficiency of the electrocatalytic oxidation of dopamine. The biosensor exhibited high sensitivity at a low detection limit of 59 nM and wide linear range from 2 x 10(-8) to 1.6 x 10(-6) M (R = 0.9983). More importantly, the sensor effectively avoids the interference of ascorbic acid and uric acid. A possible electrocatalytic mechanism has been proposed. The LaFeO3 microspheres are highly promising for the detection of dopamine because of their high selectivity, fast response and good sensitivity. (AU)

• Processo FAPESP: 13/19049-0 - Síntese e caracterização do composto CuAlO2 nanoestruturado: uma investigação sistemática da dependência da sensibilidade a diferentes tipos de gases em função da morfologia
• Beneficiário: Thirumalairajan Subramaniam
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado