title: Diethyldithiocarbamate functionalized CdSe/CdS quantum dots as a fluorescent probe for copper ion detection.
abstract: A new fluorescent probe for copper ion detection is reported that it is based on the quenching of the fluorescence of the diethyldithiocarbamate (DDTC)-functionalized quantum dots (QDs) in the presence of copper ions. DDTC was bound to the QDs via the surface ligand exchange to form DDTC-QDs conjugates following the capping of 2-mercaptoacetic acid on the core-shell CdSe/CdS QDs. It was found that the fluorescence intensity of the conjugates was quenched after coordinated with Cu(2+). A linear relationship existed between the extent of quenching and the concentration of copper in the range of 0-100 μg L(-1), with a detection limit of 0.29 μg L(-1) (3σ). The DDTC-functionalized QDs showed excellent selectivity for Cu(2+) over other metal cations. The fluorescent probe was successfully used for the determination of copper in environmental samples.
authors.affiliation: College of Chemistry, Chemical Engineering and Materials Science, Suzhou, Jiangsu 215123, China.
authors.forename: Jiazi
authors.initials: J
authors.lastname: Wang
authors.forename: Xiaopan
authors.initials: X
authors.lastname: Zhou
authors.forename: Hongbing
authors.initials: H
authors.lastname: Ma
authors.forename: Guanhong
authors.initials: G
authors.lastname: Tao
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D019187:Cadmium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D004050:Ditiocarb / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D007477:Ions / Q000032:analysis / Q000737:chemistry; D057230:Limit of Detection; D008954:Models, Biological; D045663:Quantum Dots; D018036:Selenium Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D007477:Ions; D018036:Selenium Compounds; D003300:Copper; D004050:Ditiocarb