Receptor-based detection of 2,4-dinitrotoluene using modified three-dimensionally ordered macroporous carbon...

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Explosives detection, particularly for compounds like 2,4,6-trinitrotoluene (TNT), is crucial.
• 2,4-dinitrotoluene (DNT) is a common analogue of TNT, making its detection important.
• Electrochemical methods offer sensitive and selective detection of target analytes.

Purpose of the Study:

• To develop a sensitive electrochemical sensor for the detection of 2,4-dinitrotoluene (DNT).
• To functionalize three-dimensionally ordered macroporous (3DOM) carbon with a specific receptor for DNT detection.
• To optimize detection parameters and assess sensor performance in the presence of interferents.

Main Methods:

• Modification of 3DOM carbon electrode surfaces with nitrophenyl and aminophenyl groups.
• Synthesis of a receptor molecule containing urea groups and a primary amine for DNT binding.
• Electrochemical detection of DNT using cyclic voltammetry (CV) and square wave voltammetry (SWV).
• Evaluation of sensor performance, including detection limit and selectivity against interferents.

Main Results:

• A receptor-based electrode was successfully fabricated on 3DOM carbon.
• Square wave voltammetry (SWV) effectively eliminated background current, improving detection limits compared to cyclic voltammetry (CV).
• The functionalized electrode demonstrated a detection limit of 10 μM for DNT.
• Selective detection of DNT was achieved even in the presence of interferents like nitrobenzene.

Conclusions:

• The developed receptor-modified 3DOM carbon electrode provides a sensitive platform for electrochemical DNT detection.
• SWV is a superior technique for this application due to its ability to mitigate background capacitance.
• The sensor shows promise for practical applications in explosives detection.