AbstractNitrogen-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 abstractThe illustration for synthesis of the N-CDs and its applications for colorimetric and fluorescent detection of Fe3+ and fluorescent ink.

中文翻译：

---

具有高量子产率的氮掺杂碳点，用于三价铁离子和荧光墨水的比色和荧光检测

摘要制备了量子产率为 41 ± 3% 且稳定性优异的氮掺杂碳点 (N-CDs)，并被证明是用于测定铁离子的可行探针，铁离子是一种强荧光猝灭剂。N-CDs 的吸收峰位于 325 nm。N-CDs 的最佳激发和发射波长分别为 340 nm 和 430 nm。对 Fe(III) 的荧光响应在 1.0 到 21.0 μM 和 0.05 到 30.0 μM 之间呈线性，比色法检测限为 0.28 μM，荧光法检测限为 13.5 nM。Fe(III) 的淬火主要归因于螯合（静态淬火）和内部过滤效应的结合。N-CDs由于具有很强的发光性能和化学惰性，还可以作为一种新型的荧光油墨。