Hao Yunping, Li Ronghui, Liu Yanxu, Zhang Xuhong, Geng Lina, Chen Shenna
College of Chemistry and Material Science, Hebei Key Laboratory of Organic Functional Molecules, Hebei Normal University, Shijiazhuang, 050024, China.
J Fluoresc. 2023 Mar;33(2):459-469. doi: 10.1007/s10895-022-03057-3. Epub 2022 Nov 28.
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), C-NMR spectrum, zeta potential, Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible (UV-vis) absorption and fluorescence spectra, and detected the Hg 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 Hg and AA based on the "on-off-on" fluorescence behavior. The detection limits of CDs for Hg and AA were 0.138 μM and 0.212 μM, respectively. Fluorescence response mechanism of CDs was also discussed.
碳点（CDs）具有优异的荧光特性，可用于许多研究领域。本文采用微波辅助热解柠檬酸和尿素的方法制备了碳点，通过透射电子显微镜（TEM）、X射线衍射仪（XRD）、碳核磁共振谱（C-NMR）、zeta电位、傅里叶变换红外光谱（FT-IR）、紫外可见（UV-vis）吸收光谱和荧光光谱对其进行了表征，并依次检测了汞和抗坏血酸（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约为15%。基于“开-关-开”荧光行为，碳点对汞和抗坏血酸具有选择性和敏感性。碳点对汞和抗坏血酸的检测限分别为0.138μM和0.212μM。同时还讨论了碳点的荧光响应机理。
