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The on–off-on Fluorescence Sensor of Hollow Carbon Dots for Detecting Hg2+ and Ascorbic Acid
Journal of Fluorescence ( IF 2.7 ) Pub Date : 2022-11-28 , DOI: 10.1007/s10895-022-03057-3
Yunping Hao 1 , Ronghui Li 1 , Yanxu Liu 1 , Xuhong Zhang 1 , Lina Geng 1 , Shenna Chen 1
Affiliation  

Carbon dots (CDs) have excellent fluorescence properties and can be used in many research fields. In this paper, carbon dots were prepared by microwave-assisted pyrolysis of citric acid and urea, characterized by transmission electron microscope (TEM), X-ray diffractometer (XRD), 13C-NMR spectrum, zeta potential, Fourier transform infrared spectroscopy (FT-IR), ultraviolet–visible (UV–vis) absorption and fluorescence spectra, and detected the Hg2+ and ascorbic acid (AA) sequentially. It showed that carbon dots were hollow, spherical particles and less than 10 nm, photoluminescence quantum yield of carbon dots was about 15%. The CDs were selective and sensitive to Hg2+ and AA based on the “on–off-on” fluorescence behavior. The detection limits of CDs for Hg2+ and AA were 0.138 μM and 0.212 μM, respectively. Fluorescence response mechanism of CDs was also discussed.



中文翻译:

检测Hg2+和抗坏血酸的空心碳点开关荧光传感器

碳点 (CD) 具有优异的荧光特性,可用于许多研究领域。本文采用柠檬酸和尿素微波辅助热解制备碳点,采用透射电子显微镜(TEM)、X射线衍射仪(XRD)、 13 C-NMR谱、zeta电位、傅里叶变换红外光谱( FT-IR)、紫外-可见 (UV-vis) 吸收和荧光光谱,并依次检测 Hg 2+和抗坏血酸 (AA)。结果表明,碳点为空心球形颗粒,粒径小于10nm,碳点的光致发光量子产率为15%左右。基于“开-关-开”荧光行为,CD 对 Hg 2+和 AA 具有选择性和敏感性。CD对Hg的检测限2+和 AA 分别为 0.138 μM 和 0.212 μM。还讨论了CD的荧光响应机制。

更新日期:2022-11-28
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