Synthesis of cysteamine-coated CdTe quantum dots for the detection of bisphenol A |
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Authors: | Rui Kuang Xuan Kuang Siyi Pan Xiaodong Zheng Jiacai Duan Yaqing Duan |
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Institution: | 1. College of Food Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China
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Abstract: | Cadmium telluride quantum dots (QDs) were prepared and coated with cysteamine using ultrasonic irradiation. The QDs were characterized by fluorescence spectroscopy, UV-vis absorption spectra, X-ray diffraction and infrared spectroscopy. The QDs possess a quantum yield as high as 46% and a quite narrow emission band (full width at half maximum of 38 nm). The fluorescence of these QDs is quenched by bisphenol A (BPA), and quenching can be described by a Stern-Volmer equation with correlation coefficient of 0.998. These findings resulted in a simple and rapid technique for determination of BPA that was applied to its determination in feeding bottles. |
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