Issue 45, 2021

Electrochemical detection of carbendazim in strawberry based on a ruthenium–graphene quantum dot hybrid with a three-dimensional network structure and Schottky heterojunction

Abstract

The hybrid of a metal with graphene can improve electrochemical properties, but present hybrids cannot break through the limitations of their inherent properties because metals and graphene are conductors. This study reports the synthesis of a ruthenium-graphene quantum dot hybrid via the reduction of RuCl3 with aspartic acid and arginine-functionalized graphene quantum dots (Asp–Arg–GQDs). Asp–Arg–GQDs act as the reducing agent, stabilizer, linker and semiconductor for the synthesis. The resulting RuAsp–Arg–GQDs possess a three-dimensional network structure composed of small Ru nanoparticles and small graphene sheets. The hybridization of Ru with Asp–Arg–GQDs results in the formation of a Schottky heterojunction at the interface. This unique structure improves the catalytic activity of Ru nanoparticles. The sensor based on RuAsp–Arg–GQD exhibits better sensitivity towards the electrochemical detection of carbendazim compared with the reported sensors. Differential pulse voltametric peak current increases linearly with an increase in the carbendazim concentration in the range from 0.01 μM to 45 μM with a detection limit of 0.004 μM. The proposed method has been successfully applied in the electrochemical detection of carbendazim in strawberry. This study also provides a way for the construction of a metal–graphene hybrid with excellent catalytic performance in the fields of sensing, energy storage and catalysis.

Graphical abstract: Electrochemical detection of carbendazim in strawberry based on a ruthenium–graphene quantum dot hybrid with a three-dimensional network structure and Schottky heterojunction

Supplementary files

Article information

Article type
Paper
Submitted
25 Sep 2021
Accepted
22 Oct 2021
First published
22 Oct 2021

New J. Chem., 2021,45, 21308-21314

Electrochemical detection of carbendazim in strawberry based on a ruthenium–graphene quantum dot hybrid with a three-dimensional network structure and Schottky heterojunction

D. Xu, R. Li, G. Wang, H. Zhu and Z. Li, New J. Chem., 2021, 45, 21308 DOI: 10.1039/D1NJ04602K

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