College of Chemistry and Chemical Engineering, and Institute of Environmental Science, Shanxi University, Taiyuan, 030006, China.
J Mater Chem B. 2020 Mar 11;8(10):2123-2127. doi: 10.1039/c9tb02934f.
Novel orange-emitting N-doped carbon dots (N-CDs) were prepared as fluorescent and colorimetric dual-mode probes for sensing nitrite (NO2-). The obtained N-CDs possessed fantastic optical properties and specific responses to NO2-. NO2- could induce the fluorescence static quenching of N-CDs, and a linear relationship was obtained in the range from 2 to 60 μM with the detection limit of 0.35 μM. More interestingly, the N-CDs exhibited ratiometric absorption signals with visible color conversion (red-purple), which allowed the development of a simple colorimetric method for NO2- monitoring in the linear range of 2-80 μM with a detection limit down to 0.13 μM. Additionally, the N-CDs were capable of monitoring NO2- in the A549 cells, which indicated their great potential in biosensing.
新型橙色发光氮掺杂碳点（N-CDs）被制备为荧光和比色双模式探针，用于检测亚硝酸盐（NO2-）。所得到的 N-CDs 具有出色的光学性质和对 NO2-的特异性响应。NO2-可以诱导 N-CDs 的荧光静态猝灭，在 2 到 60 μM 的范围内获得了线性关系，检测限为 0.35 μM。更有趣的是，N-CDs 表现出与可见颜色转换（红紫色）相关的比率吸收信号，这允许开发一种简单的比色法来监测 NO2-，线性范围为 2-80 μM，检测限低至 0.13 μM。此外，N-CDs 能够在 A549 细胞中监测 NO2-，这表明它们在生物传感中有很大的潜力。
