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Lanthanum cobaltite supported on graphene nanosheets for non-enzymatic electrochemical determination of catechol

Authors
  • Suvina, V.1
  • Kokulnathan, Thangavelu2
  • Wang, Tzyy-Jiann2
  • Balakrishna, R. Geetha1
  • 1 Jain University, Kanakapura, Bangalore, 562112, India , Bangalore (India)
  • 2 National Taipei University of Technology, Taipei, Taiwan, 10608, Republic of China , Taipei (Taiwan)
Type
Published Article
Journal
Microchimica Acta
Publisher
Springer-Verlag
Publication Date
Feb 26, 2020
Volume
187
Issue
3
Identifiers
DOI: 10.1007/s00604-020-4165-3
Source
Springer Nature
Keywords
License
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Abstract

An electrochemical sensor is described for the determination of catechol (CT) based on the nanocomposite of lanthanum cobaltite supported on graphene nanosheets (LaCo/GNS). The nanocomposite was systematically examined by various analytical and spectroscopic methods. The LaCo/GNS-modified electrode exhibites good electrochemical activity towards CT determination compared to other modified and unmodified electrodes. The electrochemical signal was acquired at a redox potential of 0.21 (Epa) and 0.17 (Epc) Volt (vs. Ag/AgCl). The proposed electrode exhibits low detection limit (1.0 nM), wide working range (0.009–132 μM), and good sensitivity (5.68 μA μM−1 cm−2). The electrochemical nanoprobe has good selectivity over potentially interfering compounds. The electrochemical sensor was applied to the analysis of environmental samples with acceptable recovery. Graphical abstractSchematic representation of electrochemical determination of catechol in the environmental sample analysis using lanthanum cobaltite supported on graphene nanosheets.

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