一步法在三聚氰胺辅助下合成石墨相氮化碳纳米片及其对汞离子的荧光检测应用。
One-step synthesis of graphitic carbon nitride nanosheets with the help of melamine and its application for fluorescence detection of mercuric ions.
机构信息
College of Chemistry, Nanchang University, Nanchang 330031, China.
College of Chemistry, Nanchang University, Nanchang 330031, China; State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
出版信息
Talanta. 2017 Mar 1;164:458-462. doi: 10.1016/j.talanta.2016.12.004. Epub 2016 Dec 6.
A facile, simple, and relatively environment-friendly hydrothermal approach was developed for one-step synthesis of graphitic carbon nitride nanosheets (GCNNs) using melamine and sodium citrate as the precursors. The prepared GCNNs emit strong fluorescence with a high quantum yield of 48.3%. The GCNNs were then characterized by various techniques including transmission electron microscopy, atomic force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and UV-Vis absorption spectroscopy. In addition, the fluorescence quenching behavior of the GCNNS by mercuric ions (Hg) was exploited to fabricate a label-free fluorescence quenching sensor for sensitive and selective detection of Hg. The results showed that there existed a linear relationship between the fluorescence intensity and the concentration of Hg from 0.001 to 1.0μM with a detection limit of 0.3nM. Finally, the sensor was successfully used to detection of Hg in water and milk samples.
一种简便、绿色的水热法一步合成了石墨相氮化碳纳米片（GCNNs），以三聚氰胺和柠檬酸钠为前驱体。所制备的 GCNNs 具有强荧光，量子产率高达 48.3%。通过透射电子显微镜、原子力显微镜、X 射线衍射、傅里叶变换红外光谱和紫外-可见吸收光谱等多种技术对 GCNNs 进行了表征。此外，还利用 GCNNs 对汞离子（Hg）的荧光猝灭行为，构建了一种无标记荧光猝灭传感器，用于灵敏和选择性检测 Hg。结果表明，Hg 的浓度在 0.001 至 1.0μM 范围内与荧光强度呈线性关系，检测限为 0.3nM。最后，该传感器成功用于水样和奶样中 Hg 的检测。
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