Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Beijing Key Lab of Radioactive Waste Treatment, Tsinghua University, Beijing 100084, People's Republic of China.
Nanoscale. 2015 Dec 28;7(48):20743-8. doi: 10.1039/c5nr05804j. Epub 2015 Nov 25.
Developing a simple synthesis method and expanding the application of carbon dots have attracted increasing attention. In this report, we have developed a facile method to synthesize fluorescent carbon dots (CDs) with the assistance of atmospheric-pressure microplasma. The CDs could be produced within a few minutes with no need of high temperature, external energy input, and multistep procedures. The as-prepared CDs had a relatively uniform size of approximately 2.3 nm. The FTIR spectrum and the XPS analysis showed that carbonyl groups and amide groups exist on the surface of CDs. The CDs showed bright blue luminescence and high stability in high salt concentration and low pH without further modification. A pH-dependent PL behavior was observed and could be applied for pH sensing in the range of 3-14. Moreover, the CDs could be utilized as a reagent capable of detecting U(vi) with a low detection limit and high selectivity.
开发简单的合成方法并拓展碳点的应用引起了越来越多的关注。在本报告中，我们开发了一种在常压微等离子体辅助下合成荧光碳点（CDs）的简便方法。该方法无需高温、外部能量输入和多步程序，数分钟内即可得到 CDs。所制备的 CDs 具有约 2.3nm 的相对均匀的尺寸。傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）分析表明，CDs 表面存在羰基和酰胺基团。CDs 具有明亮的蓝色荧光，在高盐浓度和低 pH 值下具有高稳定性，无需进一步修饰。观察到了与 pH 值相关的 PL 行为，可用于 3-14 范围内的 pH 值传感。此外，CDs 可用作一种能够检测 U(vi)的试剂，具有低检测限和高选择性。
