AbstractSilicon-doped carbon quantum dots (Si-CQDs) were employed to fabricate a ratiometric fluorometric probe that shows high selectivity for hydroquinone (HQ). The Si-CQDs were prepared through hydrothermal treatment of N-[3-(trimethoxysilyl)propyl]-ethylenediamine. If HQ is oxidized in a solution of the Si-CQDs, 1,4-benzoquinone will be formed which quenches the blue fluorescence (with excitation/emission peaks at 360/435 nm) of the Si-CQDs. Simultaneously, intense green fluorescence (with a emission peak at 513 nm) appears, probably due to the formation of n-π clathrates or of a quinone imine between 1,4-benzoquinone and amino groups on the surface of the Si-CQDs. The ratio of the green and blue fluorescence can be applied to the determination of HQ with a 0.077 μM detection limit. The analytical range extends from 1 to 40 μM. Graphical abstractSchematic of a silicon-doped carbon quantum dot-based ratiometric fluorescence probe with blue and green emission for the visual and fluorometric determination of hydroquinone.

中文翻译：

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具有蓝色和绿色发射的硅掺杂碳量子点是一种可行的对苯二酚比率荧光探针

摘要 采用掺硅碳量子点 (Si-CQD) 制备了一种对氢醌 (HQ) 显示出高选择性的比例荧光探针。Si-CQDs是通过N-[3-(三甲氧基甲硅烷基)丙基]-乙二胺的水热处理制备的。如果 HQ 在 Si-CQDs 的溶液中被氧化，将形成 1,4-苯醌，其淬灭 Si-CQDs 的蓝色荧光（激发/发射峰在 360/435 nm）。同时，出现强烈的绿色荧光（发射峰位于 513 nm），这可能是由于形成了 n-π 包合物或在 Si-CQD 表面上的 1,4-苯醌和氨基之间形成了醌亚胺。绿色和蓝色荧光的比值可用于测定 HQ，检测限为 0.077 μM。分析范围从 1 到 40 μM。