Influence of the different carbon nanotubes on the development of electrochemical sensors for bisphenol A

Materials Science & Engineering C-Materials for Biological Applications Volume: 58 Pages: 768-773 Published: 2016

2 de janeiro de 2016 CDMF Artigo 0

FEG-SEM-micrographs-for-A-MWCNT1-untreated — FEG-SEM micrographs for: (A) MWCNT1 untreated, (B) MWCNT1 treated with HNO3 solution (5.0mol L−1), (C) MWCNT1 treated with a concentrated solution of 3HNO3:1H2SO4; (D) MWCNT2 untreated, (E) MWCNT2 treated with HNO3 solution (5.0 mol L−1), and (F) MWCNT2 treated with concentrated solution of 3HNO3:1H2SO4.

Writers: Lorena Athie Goulart and Fernando Cruz de Moraes and Lucia Helena Mascaro

Keywords: Acid treatment; Bisphenol A; Multi-walled carbon nanotubes; Electrochemical sensor

Abstract: Different methods of functionalisation and the influence of the multi-walled carbon nanotube sizes were investigated on the bisphenol A electrochemical determination. Samples with diameters of 20 to 170 nm were functionalised in HNO₃ 5.0 mol L^− 1 and a concentrated sulphonitric solution. The morphological characterisations before and after acid treatment were carried out by scanning electron microscopy and cyclic voltammetry. The size and acid treatment affected the oxidation of bisphenol A. The multi-walled carbon nanotubes with a 20–40 nm diameter improved the method sensitivity and achieved a detection limit for determination of bisphenol A at 84.0 nmol L^− 1.

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O CDMF é um dos Centros de Pesquisa, Inovação e Difusão (CEPID) apoiados pela FAPESP. O Centro também recebe investimento do CNPq, a partir do Instituto Nacional de Ciência e Tecnologia dos Materiais em Nanotecnologia (INCTMN).