Citation

Yi KY. Forensic Sci. Int. 2015; 259: 101-105.

Affiliation

Department of Forensic Chemistry, National Police University of China, Shenyang 110035, China. Electronic address: yikuiyu@163.com.

Copyright

(Copyright © 2015, Elsevier Publishing)

DOI

10.1016/j.forsciint.2015.12.028

PMID

26773219

Abstract

CdSe quantum dots were synthesized through a simple, green organic-phase method. Paraffin was used as the reaction solvent and a reducing agent, oleic acid was the reaction ligand, and oleyl amine was the stabilizer. Based on the phenomenon of TNT quenched oil-soluble CdSe quantum dot fluorescence, a simple, fast, and direct method of TNT detection was established. Under optimum conditions, the degree of fluorescence quenching of oil-soluble CdSe quantum dots had a good linear correlation with TNT concentration in the 1.0×10(-7)-5.0×10(-5)mol/L range, and the correlation coefficient was 0.9990. TNT detection limit was 2.1×10(-8)mol/L. The method was successfully used to determine TNT-explosion dust samples, results were satisfactory. The fluorescence quenching mechanism of oil-soluble CdSe quantum dots by TNT was also discussed.

Language: en