Application of CdSe quantum dots for the direct detection of TNT. (February 2016)

• Record Type: Journal Article
• Authors: Yi, Kui-Yu
• Is Part Of: Forensic science international. Volume 259(2016)
• Page Start: 101
• Page End: 105
• Publication Date: 2016-02
• Subjects: CdSe quantum dots -- Nanoparticles -- TNT -- Direct determination; Medical jurisprudence -- Periodicals; Chemistry, Forensic -- Periodicals; Forensic Medicine -- Periodicals; Médecine légale -- Périodiques; Chimie légale -- Périodiques; Gerechtelijke geneeskunde; Gerechtelijke chemie; Gerechtelijke psychiatrie; Chemistry, Forensic; Medical jurisprudence; Electronic journals; Periodicals; Electronic journals; 614.1
• DOI: 10.1016/j.forsciint.2015.12.028
• Languages: English
• ISSNs: 0379-0738

Abstract

Highlights: Oleic acid and oleyl amine wrapped CdSe quantum dots were synthesized. A novel method for determination TNT has been investigated. The fluorescence of CdSe quantum dots can be regularly quenched with addition of TNT. Proposed method for sensing TNT was sensitive and selective. Established method has been successfully performed determination of TNT in real samples. 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.