High Sensibility of Quantum Dots to Metal Ions Inspired by Hydroxyapatite Microbeads |
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Authors: | Wang Xiang Fang Zheng Liu Jinku Zhong Xinhua Ye Bangce |
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Institution: | 1. State Key Laboratory of Bioreactor Engineering, School of Bioengineering, East China University of Science and Technology, Shanghai 200237, China;2. Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China;3. Tel./Fax: 0086‐021‐64250281 |
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Abstract: | An approach for the sensitive and selective determination of Ag+, Cu2+ and Hg2+ ions was developed based on the fluorescence quenching of mercaptopropionic acid (MPA) capped CdTe quantum dots in the existence of hydroxyapatite (HAP) nanoribbon spherulites. Among various metal ions investigated, it was found that the fluorescence of CdTe QDs was only sensitive to Ag+, Cu2+ and Hg2+ ions. The addition of HAP into the CdTe system could bring forward a sensitivity improvement of about 1 to 2 orders of magnitude in the detection of Ag+ and Cu2+ compared with the plain CdTe system without the existence of HAP; while there was no sensitization effect for Hg2+. Under optimal conditions, the detection limits for Ag+, Cu2+ and Hg2+ were 20, 56 and 3.0 nmol·L?1, respectively, and the linear ranges were 0.02–50, 0.056–54 and 0.003–2.4 µmol·L?1, respectively. Mechanisms of both QDs fluorescence quenching by metal ions and the sensitization effect by HAP were also discussed. |
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Keywords: | quantum dots metal ions detection hydroxyapatite (HAP) sensitization effect |
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