Xu Dandan, Lei Fang, Chen Haohong, Yin Luqiao, Shi Ying, Xie Jianjun
School of Materials Science and Engineering, Shanghai University 99 Shang Da Road Shanghai 200444 PR China
Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences Dingxi Road 1295 Shanghai 200050 China.
RSC Adv. 2019 Mar 12;9(15):8290-8299. doi: 10.1039/c8ra10570g.
In our work, blue photoluminescent N-doped carbon dots (CDs) were developed a green and simple hydrothermal method with citric acid and polyvinyl pyrrolidone (PVP K-30) as the carbon source and the nitrogen source, respectively. The as-prepared CDs have a high fluorescent quantum yield of 30.21% and considerable luminescence stability. The fluorescence intensity of the CDs was found to be effective quenched when adding Fe ions to the CDs solution. The quenching phenomenon can be used to detect Fe ions within a linear range of 0-300 μM with a detection limit of 45.5 nmol L, which suggested its potential application in the detection of Fe ions. At the same time, we also noted the excellent self-quenching-resistant property of the as-prepared CDs in the solid state, and bright blue fluorescence was observed under UV excitation. What's more, the as-prepared CDs can also be used as fluorescent ink and were presented under UV excitation.
在我们的工作中，采用绿色简便的水热法，分别以柠檬酸和聚乙烯吡咯烷酮（PVP K-30）作为碳源和氮源，制备了蓝色光致发光的氮掺杂碳点（CDs）。所制备的碳点具有30.21%的高荧光量子产率和相当可观的发光稳定性。当向碳点溶液中加入铁离子时，发现碳点的荧光强度被有效猝灭。这种猝灭现象可用于在0-300μM的线性范围内检测铁离子，检测限为45.5 nmol/L，这表明其在铁离子检测方面具有潜在应用。同时，我们还注意到所制备的碳点在固态下具有优异的抗自猝灭性能，在紫外光激发下观察到明亮的蓝色荧光。此外，所制备的碳点还可作为荧光墨水，并在紫外光激发下呈现出来。
