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Mikrochim Acta. 2019 Dec 5;187(1):17. doi: 10.1007/s00604-019-4031-3.

Three-dimensional zinc oxide nanostars anchored on graphene oxide for voltammetric determination of methyl parathion.

Author information

1
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan, Republic of China.
2
Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, Republic of China. spveerakumar@gmail.com.
3
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan, Republic of China. spveerakumar@gmail.com.
4
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, 10608, Taiwan, Republic of China. smchen78@ms15.hinet.net.
5
Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, Republic of China. kclin@ntu.edu.tw.
6
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan, Republic of China. kclin@ntu.edu.tw.

Abstract

The two-step microwave method was used to synthesize zinc oxide nanostars linked to graphene oxide (GO) nanosheets. The material was used to modify a screen printed carbon electrode (SPCE) and then explored as a binder-free electrocatalyst for the electrochemical determination of methyl parathion (MP). The morphology and crystallinity of the material were characterized by various techniques. The modified SPCE shows extraordinary electrochemical performances for sensitive determination of MP. Figures of merit include (a) a wide linear dynamic range (0.03-670 μM), (b) a low detection limit (1.2 nM; at S/N = 3), (c) a comparably low working voltage (-0.69 V vs. Ag/AgCl); and (d) an excellent sensitivity (16.5 μA μM-1 cm-2) that surpasses other modified electrodes. The sensor was successfully applied to the determination of MP, even in the presence of other common electroactive interference, in (spiked) fruits and vegetables. Graphical abstractGraphene oxide anchored three-dimensional zinc oxide nanostars were used to coat electrode for the sensing of methyl parathion (MP) by voltammetry.

KEYWORDS:

Cyclic voltammetry; Differential pulse voltammetry; Electrocatalytic activity; Electrochemical detection; Organophosphate pesticide

PMID:
31807937
DOI:
10.1007/s00604-019-4031-3

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