College of Chemistry, Green Catalysis Center, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou University, Zhengzhou 450001, China.
Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Hunan Division of GRG Metrology and Test, Changsha 410000, Hunan, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Feb 15;247:119090. doi: 10.1016/j.saa.2020.119090. Epub 2020 Oct 17.
In this work, we have developed a facile method for the synthesis of glycine-functionalized graphene quantum dots (Gly-GQDs) through post-modification of graphene quantum dots with Gly under alkaline conditions. The as-synthesized Gly-GQDs exhibit an excellent blue emission at 444 nm, independent of excitation, as well as a high quantum yield (QY) of 35.7%. The Gly-GQDs have a narrow size distribution with an average size of 5.9 nm. Moreover, the as-prepared Gly-GQDs showed a better selective and sensitive recognition capability towards mercury ion (Hg) in aqueous solutions with a low detection limit of 8.3 nM, compared with GQDs and other nitrogen-doped GQDs synthesized through the one-step solvent thermal method. Gly-GQDs are successfully applied for the determination of Hg in real water samples. This work shows a new promising approach for the design and synthesis of desirable GQDs with a given function.
在这项工作中，我们通过在碱性条件下用甘氨酸对石墨烯量子点进行后修饰，开发了一种简单的甘氨酸功能化石墨烯量子点（Gly-GQDs）的合成方法。所合成的 Gly-GQDs 在 444nm 处表现出优异的蓝色发射，与激发无关，量子产率（QY）高达 35.7%。Gly-GQDs 的尺寸分布较窄，平均尺寸为 5.9nm。此外，与通过一步溶剂热法合成的 GQDs 和其他氮掺杂 GQDs 相比，制备的 Gly-GQDs 在水溶液中对汞离子（Hg）具有更好的选择性和灵敏度识别能力，检测限低至 8.3nM。Gly-GQDs 成功应用于实际水样中 Hg 的测定。这项工作为设计和合成具有给定功能的理想 GQDs 提供了一种新的有前途的方法。
