title: Synthesis of cysteamine-coated CdTe quantum dots and its application in mercury (II) detection.
abstract: High-quality cysteamine-coated CdTe quantum dots (CA-CdTe QDs) were successfully synthesized in aqueous phase by a facile one-pot method. Through hydroxylamine hydrochloride-promoted kinetic growth strategy, water-soluble CA-CdTe QDs could be obtained conveniently in a conical flask by a stepwise addition of raw materials. The photoluminescence quantum yield (PL QY) of the obtained QDs reached 9.2% at the emission peak of 520nm. The optical property and the morphology of the QDs were characterized by UV-vis absorption spectra, photoluminescence spectra (PL) and transmission electron microscopy (TEM) respectively. Furthermore, the fluorescence of the resultant QDs was quenched by copper (II) (Cu(2+)) and mercury (II) (Hg(2+)) meanwhile. It is worthy of note that to separately detect Hg(2+), cyanide ion could be used to eliminate the interference of Cu(2+). Under the optimal conditions, the response was linearly proportional to the logarithm of Hg(2+) concentration over the range of 0.08-3.33μM with a limit of detection (LOD) of 0.07μM.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: Jiying
authors.initials: J
authors.lastname: Pei
authors.forename: Hui
authors.initials: H
authors.lastname: Zhu
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Wang
authors.forename: Hanchang
authors.initials: H
authors.lastname: Zhang
authors.forename: Xiurong
authors.initials: X
authors.lastname: Yang
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D003300:Copper / Q000032:analysis; D003486:Cyanides; D003543:Cysteamine / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D045663:Quantum Dots; D013056:Spectrophotometry, Ultraviolet; D013691:Tellurium / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D003486:Cyanides; D007477:Ions; D003543:Cysteamine; D003300:Copper; D008628:Mercury; D013691:Tellurium; C028337:cadmium telluride