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Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions

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Determination of explosives using electrochemically reduced graphene.

Ti-Wei Chen¹, Zhen-Huan Sheng, Kang Wang

¹Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.

Chemistry, an Asian Journal

|March 10, 2011

Summary

A new graphene-based sensor detects explosive nitroaromatic compounds (NACs) with high sensitivity. This electrochemical method uses reduced graphene oxide on a glassy carbon electrode for rapid and reliable explosive detection.

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Area of Science:

Electrochemistry
Materials Science
Analytical Chemistry

Background:

Nitroaromatic compounds (NACs) are common explosives requiring sensitive detection methods.
Graphene oxide (GO) can be modified for electrochemical applications.
Glassy carbon electrodes (GCE) are widely used platforms for sensing.

Purpose of the Study:

To develop a sensitive graphene-based electrochemical sensing platform for NACs.
To utilize electrochemically reduced graphene oxide (ER-GO) for enhanced sensing performance.
To investigate the detection capabilities for various NACs.

Main Methods:

Electrochemical reduction of graphene oxide (GO) on a glassy carbon electrode (GCE) to form ER-GO.
Stripping voltammetry for the detection of 2,4-dinitrotoluene (2,4-DNT) and other NACs.
Characterization using electrochemistry, IR, and Raman spectroscopy.

Main Results:

The ER-GO modified GCE exhibited a wrinkled morphology and large active surface area.
Low detection limit of 42 nmol/L for 2,4-DNT with a wide linear range.
Efficient detection of other NACs (1,3-DNB, TNT, TNB) at nanomolar levels.
Enhanced electrochemical signal attributed to graphene's electrocatalytic activity and π-π stacking interactions.

Conclusions:

Electrochemical reduction of GO is a facile method for creating effective graphene-modified electrodes.
The developed sensor demonstrates high sensitivity and broad applicability for detecting NACs.
This platform offers a promising approach for sensitive detection of explosive compounds.