title: Application of CdSe quantum dots for the direct detection of TNT.
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.
authors.affiliation: Department of Forensic Chemistry, National Police University of China, Shenyang 110035, China. Electronic address: yikuiyu@163.com.
authors.forename: Kui-Yu
authors.initials: KY
authors.lastname: Yi
mesh_terms: D019187:Cadmium Compounds; D019301:Oleic Acid; D045663:Quantum Dots; D018036:Selenium Compounds; D013050:Spectrometry, Fluorescence; D014303:Trinitrotoluene / Q000032:analysis*
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; D014303:Trinitrotoluene; D019301:Oleic Acid
keywords: CdSe quantum dots; Direct determination; Nanoparticles; TNT