title: A highly selective and simple fluorescent sensor for mercury (II) ion detection based on cysteamine-capped CdTe quantum dots synthesized by the reflux method.
abstract: Cysteamine (CA)-capped CdTe quantum dots (QDs) (CA-CdTe QDs) were prepared by the reflux method and utilized as an efficient nano-sized fluorescent sensor to detect mercury (II) ions (Hg(2+) ). Under optimum conditions, the fluorescence quenching effect of CA-CdTe QDs was linear at Hg(2+) concentrations in the range of 6.0-450 nmol/L. The detection limit was calculated to be 4.0 nmol/L according to the 3σ IUPAC criteria. The influence of 10-fold Pb(2+) , Cu(2+) and Ag(+) on the determination of Hg(2+) was < 7% (superior to other reports based on crude QDs). Furthermore, the detection sensitivity and selectivity were much improved relative to a sensor based on the CA-CdTe QDs probe, which was prepared using a one-pot synthetic method. This CA-CdTe QDs sensor system represents a new feasibility to improve the detection performance of a QDs sensor by changing the synthesis method.
authors.affiliation: The College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, People's Republic of China.
authors.forename: Xiaojie
authors.initials: X
authors.lastname: Ding
authors.forename: Lingbo
authors.initials: L
authors.lastname: Qu
authors.forename: Ran
authors.initials: R
authors.lastname: Yang
authors.forename: Yuchen
authors.initials: Y
authors.lastname: Zhou
authors.forename: Jianjun
authors.initials: J
authors.lastname: Li
mesh_terms: D002021:Buffers; D002104:Cadmium / Q000737:chemistry*; D003543:Cysteamine / Q000737:chemistry*; D060766:Drinking Water / Q000032:analysis / Q000737:chemistry; D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D045663:Quantum Dots / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000295:instrumentation / Q000379:methods; D013691:Tellurium / Q000737:chemistry*
chemical_list: D002021:Buffers; D060766:Drinking Water; D002104:Cadmium; D003543:Cysteamine; D008628:Mercury; D013691:Tellurium
keywords: CdTe quantum dots; cysteamine; fluorescent sensor; mercury (II) ion