利用焦磷酸硫胺素作为前驱体,通过水热法一步合成氮、磷、硫共掺杂碳点。焦磷酸硫胺素分子结构内含有嘧啶环和噻唑环,并含有氨基和焦磷酸基。水热处理后,这些结构和基团被重组或保留,使氮、磷、硫等杂原子进入到碳点中。该碳点的无序化程度较高,存在着大量缺陷。这些缺陷使得碳点具有较高的荧光量子产率,达到了19.6%,明显高于其他已报道的共掺杂碳点。该碳点的荧光强度在碱性范围内,与pH值呈现显著的线性关系,可以用来定量检测碱性溶液的pH值。

Thiamine pyrophosphate is used to synthesize carbon dots via the hydrothermal method.The existing pyridine rings,thiazole rings,amino groups and pyrophosphoric groups in the thiamine pyrophosphate molecules will be recombined or preserved after hydrothermal treatment and then the nitrogen,phosphorus and sulfur atoms can get into the generated carbon dots.The prepared carbon dots own lots of defects,which will improve the fluorescence quantum yield of the carbon dots.The quantum yield reaches 19.6% which is higher than that of many other reported carbon dots.The obtained carbon dots can be applied in pH quantitative detection for basic solutions because of the linear relationship between fluorescence intensity and pH in the alkaline range.