Citation: Xiao-Dong Xia, Hao-Wen Huang. Using unmodifi ed Au nanoparticles as colorimetric probes for TNT based on their competitive reactions with melamine[J]. Chinese Chemical Letters, ;2014, 25(9): 1271-1274. doi: 10.1016/j.cclet.2014.03.008 shu

Using unmodifi ed Au nanoparticles as colorimetric probes for TNT based on their competitive reactions with melamine

Xiao-Dong Xia ^, ,
Hao-Wen Huang

1.
Key Laboratory of Theoretical Chemistry and Molecular Simulation, Minister of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Corresponding author: Xiao-Dong Xia,
Received Date: 14 January 2014
Available Online: 28 February 2014
Fund Project: This work is supported by National Natural Science Foundation of China (No. 21375036) (No. 21375036)

Gold nanoparticles (Au NPs) can serve as visualized colorimetric probes for various targets and modification-free sensing strategies are preferred. The donor-acceptor interaction between the electron-rich melamine (MA) and the electron-deficient trinitrotoluene (TNT) allows formation of a supramolecule in aqueous solution. Melamine alone makes the initially individual reddish Au NPs aggregate into gray/blue Au NP assemblies due tomelamine forming multiple ligand sites toward the Au NPs. Interestingly, the preformed supramolecule of MA-TNT disenables aggregation of the Au NPs. Therefore the unmodified Au NPs provide facile colorimetric probes for TNT detection in aqueous solution. Rapid identification of TNT is established by naked eye inspection. By using spectrophotometer tools, quantification of TNT is accomplished with a linear range of 80 μmol L^-1 to 1.2 μmol L^-1 and a limit of detection (LOD) of 27 μmol L^-1. In contrast to previous strategy with surface-modified Au NPs, here a modification-free sensing strategy for TNT assay has been developed with greater convenience, rapidity, and cost-effectiveness.
- Electron donor-acceptor interaction,
- Gold nanoparticles,
- Melamine,
- Trinitrotoluene,
- Colorimetry
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