title: A novel phosphorescence sensor for Co2+ ion based on Mn-doped ZnS quantum dots.
abstract: N-acetyl-L-cysteine-capped Mn-doped ZnS quantum dots (QDs) were prepared by hydrothermal methods. It could emit phosphorescence at 583 nm with the excitation wavelength at 315 nm. The phosphorescence intensity of QDs could be quenched dramatically by increasing the concentration of Co(2+) ion. The novel phosphorescence sensor based on N-acetyl-L-cysteine-capped QDs was developed for detecting Co(2+) ion with a linear dynamic range of 1.25 × 10(-6) -3.25 × 10(-5) m. The limit of detection and RSD were 6.0 × 10(-8) m and 2.3%, respectively. Interference experiments showed excellent selectivity over numerous cations such as alkali, alkaline earth and transitional metal ions. The possible quenching mechanism was also examined by phosphorescence decays. The proposed phosphorescence method was further applied to the trace determination of Co(2+) ion in tap and pond water samples with recoveries of 97.75-103.32%.
authors.affiliation: Department of Chemistry and Chemical Engineering, Research Center of Environmental Science and Engineering, Shanxi University, Taiyuan, 030006, People's Republic of China; School of Basic Medical Science, Shanxi Medical University, Taiyuan, 030001, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Bian
authors.forename: Jing
authors.initials: J
authors.lastname: Ma
authors.forename: Qiaoling
authors.initials: Q
authors.lastname: Liu
authors.forename: Yanli
authors.initials: Y
authors.lastname: Wei
authors.forename: Yingfu
authors.initials: Y
authors.lastname: Li
authors.forename: Chuan
authors.initials: C
authors.lastname: Dong
authors.forename: Shaomin
authors.initials: S
authors.lastname: Shuang
mesh_terms: D000111:Acetylcysteine / Q000737:chemistry; D003035:Cobalt / Q000032:analysis*; D007477:Ions / Q000032:analysis; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods*; D008345:Manganese / Q000737:chemistry*; D045663:Quantum Dots; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry*; D017967:Zinc Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D007477:Ions; D049408:Luminescent Agents; D013440:Sulfides; D017967:Zinc Compounds; D003035:Cobalt; D008345:Manganese; C031238:zinc sulfide; D000111:Acetylcysteine
keywords: cobalt ion; doped quantum dots; phosphorescence sensor