1. Fluorescence ‘off–on’ probe for lead (II) detection based on Atractylodes III CQDs and bioimaging
- Author
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Yaqing Zhang, Sijie Cheng, Xin Wang, Yingte Wang, and Yong Zhang
- Subjects
Chemistry (miscellaneous) ,Quantum Dots ,Spectroscopy, Fourier Transform Infrared ,Biophysics ,Atractylodes ,Carbon ,Fluorescent Dyes - Abstract
In this work, a type of carbon quantum dots (CQDs) with bright blue emission was readily fabricated through one-step hydrothermal treatment from Atractylodes III. We explored the surface morphology and optical properties of the CQDs using transmission electron microscopy, X-ray diffraction patterns, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and ultraviolet-visible light spectrophotometry. The obtained CQDs possessed good photoluminescence properties, water solubility, and biocompatibility. The fluorescence quantum yield of these was 3.72%. It was found that the fluorescence intensity of CQDs was quenched by picric acid. After adding lead (II), the fluorescence could be effectively recovered. Therefore, an 'off-on' fluorescence probe was designed to detect lead (II) in the range 0-580 μM and the limit of detection was 0.068 μM. In addition, the experiments showed that the CQDs could be successfully used in bioimaging and as a hidden fluorescent ink.
- Published
- 2022
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