School of Chemical Science and Technology, Yunnan University, Kunming, 650091, China.
Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Yunnan Province Key Lab of Wood Adhesives and Glued Products, School of Materials Science and Engineering, Southwest Forestry University, Kunming, 650224, China.
Mikrochim Acta. 2019 Jan 9;186(2):67. doi: 10.1007/s00604-018-3176-9.
Nitrogen-doped carbon dots (N-CDs) with a quantum yield of 41 ± 3% and excellent stability were prepared and are shown to be viable probes for the determination of ferric ions, which is a strong quencher of fluorescence. The absorption peak of the N-CDs is located at 325 nm. The optimal excitation and emission wavelengths of the N-CDs are 340 nm and 430 nm, respectively. The fluorometric response to Fe(III) is linear in the ranges between 1.0 and 21.0 μM and between 0.05 and 30.0 μM, and the limits of detection are 0.28 μM in case of colorimetry and 13.5 nM in case of fluorometry. Quenching by Fe(III) is mainly attributed to a combination of chelation (static quenching) and inner filter effect. The N-CDs also can be used as a new sort of fluorescent ink owing to the strong luminous performance and chemical inertness. Graphic abstract The illustration for synthesis of the N-CDs and its applications for colorimetric and fluorescent detection of Fe and fluorescent ink.
氮掺杂碳点（N-CDs）的量子产率为 41±3%，稳定性好，被证明是测定铁离子的可行探针，铁离子是荧光的强猝灭剂。N-CDs 的吸收峰位于 325nm。N-CDs 的最佳激发和发射波长分别为 340nm 和 430nm。N-CDs 对 Fe(III) 的荧光响应在 1.0 和 21.0μM 之间以及在 0.05 和 30.0μM 之间呈线性，比色法的检测限为 0.28μM，荧光法的检测限为 13.5nM。Fe(III) 的猝灭主要归因于螯合（静态猝灭）和内滤效应的结合。由于具有较强的发光性能和化学惰性，N-CDs 也可用作新型荧光油墨。
