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Urea-type ligand-modified CdSe quantum dots as a fluorescence “turn-on” sensor for CO32− anions

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Abstract

A new fluorescence “turn-on” nanosensor for carbonate determination was reported based on CdSe quantum dots (QDs) modified with thio ligands containing urea groups: N-(5-mercapto-1,3,4-thiadiazol-2-ylcarbamoyl)-2-(o-tolyloxy)acetamide (AASH-CdSe QDs). The AASH-CdSe QDs were prepared through a ligand exchange process and characterized by transmission electron microscopy (TEM), fluorescence spectroscopy, UV-vis spectroscopy and FT-IR spectroscopy. The synthesized AASH-CdSe QDs allowed a selective fluorescence “turn-on” response towards carbonate. Under optimal conditions, the relative fluorescence intensity increases linearly with carbonate concentration in the range 1 × 10−7–1 × 10−4 M with a detection limit of 2.3 × 10−8 M. A Langmuir-type binding model was highly effective in describing the carbonate concentration dependence of the luminescence intensity of the AASH-CdSe QDs. The possible mechanism was discussed.

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  1. Equal contribution to this work.

Authors and Affiliations

  1. Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, 430079, PR China

    Cuiping Han, Zhimin Cui, Zhilong Zou,  Sabahaiti, Demei Tian & Haibing Li

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  1. Cuiping Han
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  2. Zhimin Cui
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  3. Zhilong Zou
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  4. Sabahaiti
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  5. Demei Tian
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  6. Haibing Li
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Correspondence to Haibing Li.

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Han, C., Cui, Z., Zou, Z. et al. Urea-type ligand-modified CdSe quantum dots as a fluorescence “turn-on” sensor for CO32− anions. Photochem Photobiol Sci 9, 1269–1273 (2010). https://doi.org/10.1039/c0pp00119h

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  • DOI: https://doi.org/10.1039/c0pp00119h

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