Development of an electrochemical sensor based on nanostructured hausmannite-type manganese oxide for detection of sodium ions

Autor(es)

Machini, Wesley B. S. ^[1] ; Martin, Cibely S. ^[1] ; Martinez, Murilo T. ^[1] ; Teixeira, Silvio R. ^[1] ; Gomes, Homero M. ^[1] ; Teixeira, Marcos F. S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ State Sao Paulo UNESP, Fac Sci & Technol, Dept Phys Chem & Biol, BR-19060900 Presidente Prudente, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 181, p. 674-680, MAY 2013.
• Citações Web of Science: 14

Resumo

The preparation and electrochemical characterization of hausmannite-type manganese oxide to use as a sensing material for sodium ion is described. This paper reports a new via synthetic to obtain of the hausmannite-type manganese oxide and its application in the construction of modified electrode as a voltammetric sensor. The electrochemical activity of hausmannite-type manganese oxide is controlled by intercalation/deintercalation of the sodium ions within the oxide lattice. The detection is based on the measurement of anodic current generated by oxidation of Mn-III-Mn-IV at electrode surface. The best electrochemical response was obtained for a sensor composition of 20% (w/w) hausmannite oxide in the paste, a TRIS buffer solution of pH 6.0-7.0 and a scan rate of 50 mV s(-1). A sensitive linear voltammetric response for sodium ions was obtained in the concentration range of 2.01 x 10(-5)-2.09 x 10(-4) mol L-1 with a slope of 355 mu A L mmol(-1) and a detection limit of 7.50 x 10(-6) mol L-1 using cyclic voltammetry. The use of hausmannite has significantly improved the selectivity of the sensor compared to the birnessite-type manganese oxide modified electrode. Under the working conditions, the proposed method was successfully applied to determination of sodium ions in urine samples. (c) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/12524-6 - Estudo e caracterização da eletropolimerização de moléculas nanoestruturadas a base de schiff.
• Beneficiário: Cibely da Silva Martin Sonvesso
• Modalidade de apoio: Bolsas no Brasil - Mestrado