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Tuning the Aggregation/Disaggregation Behaviours of ZnSe Quantum Dots for High-Sensitivity Fluorescent Rutin Sensor

Abstract

The design of quantum dots as a new sensing platform is very important for developing high-sensitivity fluorescent sensors. However, achieving new strategy is still a great challenge. Here, a new strategy for fabricating water-dispersible thiol malic acid modified ZnSe quantum dots (TMA-ZnSe QDs) is presented in aqueous solution. The characteristic of the modified TMA-ZnSe QDs and the interaction among of TMA-ZnSe QDs, Al3+ and rutin were performed by atomic force microscope, energy dispersive X-ray spectra, fluorescence, resonance rayleigh scattering, UV-vis absorption spectroscopy and Fourier transform infrared spectroscopy. A new high-sensitivity fluorescent sensor based on tuning aggregation/disaggregation behavior of TMA-ZnSe QDs by structure-switching for the detection of rutin was developed. The results confirmed that the detection sensitivity was greatly improved by the aggregation of TMA-ZnSe QDs with Al3+ due to rutin effectively quench the FL of TMA-ZnSe QDs-Al3+ via photoinduced electron transfer process. Under optimum conditions, the decreased FL intensity was linear to the rutin concentration from 0.02 μg/mL to 9 μg/mL and the detection limit of rutin is 0.02 μg/mL. The proposed method offered a new possibility for rutin detection in real samples owing to its low cost, simplicity, high sensitivity and good stability. The present work open a new strategy for improving sensitivity by tuning aggregation/disaggregation behavior of TMA-ZnSe QDs.

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Supplementary files

Publication details

The article was received on 14 Jun 2017, accepted on 01 Aug 2017 and first published on 07 Aug 2017


Article type: Paper
DOI: 10.1039/C7AY01480E
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Tuning the Aggregation/Disaggregation Behaviours of ZnSe Quantum Dots for High-Sensitivity Fluorescent Rutin Sensor

    Y. Tang, S. Yan, H. Ye, F. Zheng, L. Feng, F. Liu and X. Li, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY01480E

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