Poly 3,4-ethylenedioxythiophene and zirconia nanoparticles composite modified sensor for methyl parathion determination

摘要

Poly 3,4-ethylenedioxythiophene (PEDOT) membrane and zirconia nanoparticles (ZrO2 NPs) were directly prepared on ITO electrode successively through simple strategies. The ZrO2 NPs-chitosan/PEDOT/ITO electrode was employed as a disposal electrochemical sensor for methyl parathion (MP) detection. The structure characteristics, adsorption characteristics and electrochemical features of electrode were characterized by the SEM, XRD, UV-vis spectrometer and electrochemical analysis techniques. Combined with the individual properties of PEDOT (conductivity and electrocatalysis) and ZrO2 NPs (affinity to MP), the ZrO2 NPs-chitosan/PEDOT/ITO electrode displayed superior electrochemical performances to MP measurement with a limit of detection of 2.8 ng.ml(-1) (S/N = 3) and a linear range of 5-2000 ng.ml(-1). Furthermore, this sensor exhibited acceptable selectivity and reproducibility. The result of this sensor in real sample measure to MP detection also demonstrates precision. (C) 2019 Elsevier B.V. All rights reserved.