AbstractThe authors report on the synthesis of boron-doped carbon nanodots (B-C-dots) by a hydrothermal method using ascorbic acid and boric acid as the precursors. The dots have an irregular shape with a typical diameter of 10 nm and display strong fluorescence, with excitation/emission maxima of 350/440 nm. Fluorescence is quenched by Cu(II) and Pb(II) ions due to the formation of nonfluorescent metal complexes between chelating oxygen atoms on the surface of the dots. The findings were used to design a fluorometric method for the determination of the two ions. Linear relationships exist between the drop in fluorescence intensity and the concentrations of Cu(II) and Pb(II) ions in the range from 50 nM to 300 μM and from 25 nM to 250 μM, respectively. The fluorescence of the Cu(II)-quenched B-C-dots is restored in addition of pyrophosphate (PPi) as a result of coordination/chelation interactions between these ions and PPi. This was exploited to develop an assay for PPi that works in the of 25 to 500 μM PPi concentration range. Graphical abstractBoron-doped carbon dots have been synthesized by a hydrothermal method from L-ascorbic acid and boric acid in alkaline solution. The dots are highly selective fluorometric probes for Pb(II), Cu(II) and pyrophosphate ions.

中文翻译：

---

制备用于荧光测定 Pb(II)、Cu(II) 和焦磷酸根离子的掺硼碳点

摘要 作者报道了以抗坏血酸和硼酸为前驱体，通过水热法合成掺硼碳纳米点（BC-dots）。这些点具有不规则形状，典型直径为 10 nm，并显示出强烈的荧光，激发/发射最大值为 350/440 nm。由于在点表面上的螯合氧原子之间形成非荧光金属络合物，因此荧光被 Cu(II) 和 Pb(II) 离子淬灭。研究结果用于设计一种用于测定两种离子的荧光方法。荧光强度下降与 Cu(II) 和 Pb(II) 离子浓度分别在 50 nM 至 300 μM 和 25 nM 至 250 μM 范围内存在线性关系。由于这些离子与 PPi 之间的配位/螯合相互作用，除了焦磷酸盐 (PPi) 之外，Cu(II) 淬灭的 BC 点的荧光也得以恢复。这被用来开发一种在 25 到 500 μM PPi 浓度范围内工作的 PPi 检测方法。图形摘要 用L-抗坏血酸和硼酸在碱性溶液中通过水热法合成了掺硼碳点。这些点是对 Pb(II)、Cu(II) 和焦磷酸盐离子的高选择性荧光探针。