AbstractNitrogen-doped carbon dots (NCDs) were synthesized via hydrothermal treatment of vitamin B1 and triethylamine. The NCDs exhibit strong blue fluorescence (with a peak at 437 nm at an excitation wavelength of 370 nm), good water solubility and excellent fluorescence stability in the pH 3~12 range, at ionic strengths between 0.01 and 1 M, and under UV illumination for 6 h, as well as incubation temperature of 15~60 °C. The nanoparticles respond selectively and sensitively to trace concentrations of perfluorooctane sulfonate (PFOS) through electrostatic interactions between PFOS and NCDs. This is accompanied by the aggregation of NCDs to yield enhanced fluorescence. The nanoprobe has high selectivity for PFOS even in presence of other common ions such as metal ions, anions, and structural analogues such as surfactants. Under the optimal conditions, the response is linear in the 0.3 to 160 nM PFOS concentration range with a detection limit of 0.3 nM. Satisfactory results were achieved for determination of PFOS in spiked real water samples. Graphical abstractSchematic presentation of the synthetic route to nitrogen-doped carbon dots (NCDs) starting from vitamin B1 and triethylamine, and its application for selective and sensitive fluorometric determination of perfluorooctane sulfonate (PFOS).

中文翻译：

---

氮掺杂碳点作为一种有效的荧光增强系统，用于测定全氟辛基磺酸盐

摘要 通过维生素 B1 和三乙胺的水热处理合成了掺氮碳点 (NCDs)。NCDs 表现出强烈的蓝色荧光（在 370 nm 激发波长处的峰值为 437 nm）、良好的水溶性和在 pH 3~12 范围内、在 0.01 和 1 M 之间的离子强度和紫外线照射下出色的荧光稳定性6 h，孵育温度为 15~60 °C。纳米粒子通过全氟辛烷磺酸和非传染性疾病之间的静电相互作用，对痕量浓度的全氟辛烷磺酸 (PFOS) 做出选择性和敏感的反应。这伴随着非传染性疾病的聚集以产生增强的荧光。即使存在其他常见离子（如金属离子、阴离子和结构类似物（如表面活性剂）），纳米探针也对全氟辛烷磺酸具有高选择性。在最佳条件下，响应在 0.3 至 160 nM PFOS 浓度范围内呈线性，检测限为 0.3 nM。测定加标实际水样中的 PFOS 取得了令人满意的结果。以维生素 B1 和三乙胺为原料合成氮掺杂碳点 (NCD) 的示意图，及其在选择性和灵敏荧光测定全氟辛烷磺酸 (PFOS) 中的应用。