Issue 22, 2022

Electrochemically functionalized graphene for highly sensitive detection of nitrofurazone

Abstract

Graphene nanosheets (GS) were prepared by ultrasonic exfoliation of bulk graphite in N-methyl-2-pyrrolidone with the assistance of sodium pyrophosphate. The obtained GS suspension was modified on a glassy carbon electrode (GS/GCE), and then functionalized at different voltages (e.g. 1.0, 1.4 and 1.6 V) for 2 min in pH 7.0 phosphate buffer. The electrochemically functionalized GS/GCE (i.e. EGS/GCE) possesses more oxygen-containing groups and a higher defect level. More importantly, the active response area, electron transfer ability and interface adsorption capacity of the EGS/GCE enhanced remarkably. The possible mechanism of the performance enhancement is discussed, and the sensing application of the EGS/GCE in the detection of nitrofurazone (NFZ) is investigated. Compared with the GS/GCE, the EGS/GCE is much more active for NFZ oxidation and greatly increases the detection sensitivity. As a result, a highly sensitive electrochemical detection method has been developed for NFZ, with a detection limit of 2.1 nM. The practical application of the EGS/GCE was tested in fish meat samples, showing good accuracy and feasibility.

Graphical abstract: Electrochemically functionalized graphene for highly sensitive detection of nitrofurazone

Supplementary files

Article information

Article type
Paper
Submitted
30 Pha 2022
Accepted
05 Mph 2022
First published
06 Mph 2022

Analyst, 2022,147, 5011-5017

Electrochemically functionalized graphene for highly sensitive detection of nitrofurazone

J. Yin, H. Cui, L. Lei and K. Wu, Analyst, 2022, 147, 5011 DOI: 10.1039/D2AN01428A

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