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A Novel Cobalt-Sensitive Fluorescent Chemosensor Based on Ligand Capped CdS Quantum Dots

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Abstract

In this work, a ligand capped CdS QDs was synthesized, characterized and its fluorescence behavior was studied. The surface of the CdS QDs was modified using N-(3-methyl-2-(thiophene-2-carboxamido) phenyl) thiophene-2-carboxamide. The immobilized ligand on the surface of the CdS QDs can interact by cationic species due to the existence of donating atoms in its structures. Thus, effect of some metal cations on the fluorescent intensity of the ligand capped CdS QDs were studied. It was found that fluorescence intensity of the modified CdS QDs quenched selectively by addition of Co(II) ion in comparison with other cations tested. The ligand capped CdS QDs can be used as a fluorescent bulk chemosensor for detection of Co(II) ions. The fluorescent quenching is linear in the range of 1.0 × 10−5 to 1.5 × 10−4 mol L−1 of Co(II) ions. The limit of detection was obtained 8.3 × 10−7 mol L−1. The nanosensor exhibits high selectivity toward Co(II) ions in comparison with common metal ions.

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Acknowledgments

The authors thank the research council of University of Tehran for financial support of this work.

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Authors and Affiliations

  1. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran

    Farnoush Faridbod, Abbas Jamali, Mohammad Reza Ganjali & Parviz Norouzi

  2. Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran

    Farnoush Faridbod, Mohammad Reza Ganjali & Parviz Norouzi

  3. Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran

    Morteza Hosseini

Authors
  1. Farnoush Faridbod
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  2. Abbas Jamali
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  3. Mohammad Reza Ganjali
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  4. Morteza Hosseini
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  5. Parviz Norouzi
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Correspondence to Farnoush Faridbod.

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Faridbod, F., Jamali, A., Ganjali, M.R. et al. A Novel Cobalt-Sensitive Fluorescent Chemosensor Based on Ligand Capped CdS Quantum Dots. J Fluoresc 25, 613–619 (2015). https://doi.org/10.1007/s10895-015-1544-y

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  • DOI: https://doi.org/10.1007/s10895-015-1544-y

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