College of Food Science and Engineering, Northwest A&F University, Yangling, 712100, Shaanxi, China.
Mikrochim Acta. 2019 Jun 10;186(7):399. doi: 10.1007/s00604-019-3490-x.
Silicon-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 abstract Schematic of a silicon-doped carbon quantum dot-based ratiometric fluorescence probe with blue and green emission for the visual and fluorometric determination of hydroquinone.
硅掺杂碳量子点（Si-CQDs）被用于制备比率荧光探针，对苯二酚（HQ）具有高选择性。Si-CQDs 通过 N-[3-（三甲氧基硅基）丙基]乙二胺的水热处理制备而成。如果 HQ 在 Si-CQDs 的溶液中被氧化，则会形成 1,4-苯醌，从而猝灭 Si-CQDs 的蓝色荧光（激发/发射峰在 360/435nm）。同时，出现强烈的绿色荧光（发射峰在 513nm），可能是由于 1,4-苯醌和 Si-CQDs 表面上的氨基之间形成了 n-π 包合物或醌亚胺。绿色和蓝色荧光的比值可用于 HQ 的测定，检测限为 0.077μM。分析范围从 1 到 40μM。
