A graphene quantum dots-glassy carbon electrode-based electrochemical sensor for monitoring malathion

Graphene quantum dots (GQDs) were made via a hydrothermal process with glucose as a precursor undergoing carbonization. Different spectroscopic techniques were used to analyze the optical characteristics of GQDs, including UV-visible, photoluminescence, FTIR, and Raman spectroscopy. Atomic force mic...

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Bibliographic Details
Published in:Beilstein journal of nanotechnology 2023, Vol.14 (1), p.701-710
Main Authors: Tanwar, Sanju, Sharma, Aditi, Mathur, Dhirendra
Format: Article
Language:English
Subjects:
Carbon
Charge transfer
Chemical sensors
cyclic voltammetry
differential pulse voltammetry
Electrochemical analysis
Electrochemical impedance spectroscopy
electrochemical sensor
Electrodes
Electrons
Full Research Paper
Glassy carbon
Glucose
Graphene
graphene quantum dots
Investigations
malathion
Microscopy
Nanomaterials
Nanoscience
Nanotechnology
Optical properties
Organophosphates
Oxidation
Pesticides
Photoluminescence
Potassium
Quantum dots
Raman spectroscopy
Sensors
Voltammetry
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Summary:Graphene quantum dots (GQDs) were made via a hydrothermal process with glucose as a precursor undergoing carbonization. Different spectroscopic techniques were used to analyze the optical characteristics of GQDs, including UV-visible, photoluminescence, FTIR, and Raman spectroscopy. Atomic force microscopy, transmission electron microscopy, and X-ray diffraction were used to characterize the morphological and structural properties of GQDs. An electrochemical sensor was developed by drop casting GQDs on a glassy carbon electrode (GCE). The sensor detects the organophosphate pesticide malathion in a selective and sensitive manner. Using cyclic voltammetry, the sensor's oxidation-reduction behavior was investigated. Electrochemical impedance spectroscopy was conducted to study the electrochemical properties of the modified the GQDs/GCE working electrode, which showed excellent charge transfer properties. We measured malathion in varying concentrations between 1 to 30 µM using differential pulse voltammetry, which resulted in a limit of detection of 0.62 nM. GQDs can thus be used to develop electrochemical sensors for the detection of pesticides in water.
ISSN:2190-4286
2190-4286
DOI:10.3762/bjnano.14.56