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A new fluorescent sensor for detecting p-nitrophenol based on β-cyclodextrin-capped ZnO quantum dots
Abstract
In this work, the fluorescent β-cyclodextrin-capped ZnO quantum dots (β-CD@ZnO QDs) with a good water-solubility have been synthesized via a facile method. And the synthesized β-CD@ZnO QDs with a diameter ∼3.64 nm and a yellow fluorescence have been characterized by high resolution transmission electron microscope, UV-visible absorption, photoluminescence, and Fourier transform infrared spectroscopy. The β-CD@ZnO QDs were used as a fluorescent sensor for the detection of p-nitrophenol. A linear relationship to the concentration of the p-nitrophenol over the range of 1.0–40 μM with the detection limit of 0.34 μM was obtained. The sensing property of the β-CD-capped ZnO QDs has been successfully examined in real water samples. And the quenching mechanism was proposed, which showed that the quenching effect may be caused by the inclusion complexation between β-CD and p-nitrophenol and electron transfer.
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