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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Fluorescent probes for 'off-on' sensitive and selective detection of mercury ions and L-cysteine based on graphitic carbon nitride nanosheets
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Fluorescent probes for 'off-on' sensitive and selective detection of mercury ions and L-cysteine based on graphitic carbon nitride nanosheets

机译：基于石墨氮化碳纳米片的“关”敏感和选择性检测汞离子和L-半胱氨酸的荧光探针

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A novel approach for preparation of graphitic carbon nitride nanosheets (CNNS) from stripping graphitic carbon nitride by strong acid and ultrasonic technology was demonstrated in this study for the first time. Transmission electron microscopy (TEM) was employed to characterize the surface morphology. Atomic force microscope (AFM) was carried out to characterize the thickness of nanosheets. X-Ray diffraction (XRD) was performed to estimate the lattice structure. X-Ray photoelectron spectroscopy (XPS) was carried out to characterize the surface composition and element analysis. Fourier transform infrared spectroscopy (FT-IR) was allowed to identify the functional groups. The as-synthesized CNNS exhibited excellent emission property as well as excitation-independent emission behavior, and fluorescence quantum yields could reach approximately 12.53%. Mercury ion (Hg2+) can make a result of quenching the significant intensity of fluorescence of CNNS by formation of a covalent bond between empty orbital of Hg2+ and the p electrons of N (turn-off). Moreover, the addition of the L-cysteine (L-Cys) can enhance the intensity of fluorescence of the CNNS-Hg2+ system through the thiol group of L-Cys anchored with Hg2+ and drag it from the surface of CNNS (turn-on). The CNNS was consequently functioned as a fluorescence probe towards "off-on" detection of Hg2+ and L-Cys with high sensitivity and selectivity. Moreover, the fluorescent probe was applied to detect tap water and well water with satisfactory results.
机译：这项研究首次证明了一种通过强酸和超声技术从石墨氮化碳剥离中制备石墨氮化碳纳米片（CNNS）的新方法。透射电子显微镜（TEM）被用来表征表面形态。进行原子力显微镜（AFM）表征纳米片的厚度。进行X射线衍射（XRD）估计晶格结构。进行了X射线光电子能谱（XPS）表征表面成分和元素分析。允许使用傅立叶变换红外光谱（FT-IR）识别官能团。合成后的CNNS表现出优异的发射性能以及与激发无关的发射行为，并且荧光量子产率可达到约12.53％。汞离子（Hg2 +）可以通过在Hg2 +的空轨道和N的p电子之间形成共价键来淬灭CNNS的显着强度的荧光（截止）。此外，添加L-半胱氨酸（L-Cys）可以通过锚定Hg2 +的L-Cys的硫醇基团将CNNS-Hg2 +系统的荧光强度增强，并将其从CNNS表面拖拽（开启）。 。因此，CNNS可以作为荧光探针，以高灵敏度和高选择性“关闭”检测Hg2 +和L-Cys。此外，该荧光探针用于自来水和井水的检测，结果令人满意。

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