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利用水热法合成了掺杂锌的碲化镉量子点(CdTe∶Zn QDs),并采用反相微乳法将SiO_2包覆在量子点表面形成多层SiO_2纳米微球。通过接枝方法将罗丹明B衍生物连接在硅球上,利用Hg~(2+)可以使罗丹明B衍生物的螺环结构发生开环反应并产生荧光增强这一特性,构建了荧光共振能量转移(FRET)的比率探针,并成功实现了对水溶液中Hg~(2+)的比率检测。结果表明,该探针在波长为521nm和577nm时对Hg~(2+)具有良好的灵敏度和选择性,检测限是0.5μM。
Zinc-doped CdTe quantum dots (CdTe: Zn QDs) were synthesized by hydrothermal method, and the SiO 2 nanoparticles were coated on the surface of quantum dots to form multilayer SiO 2 nanospheres by reverse microemulsion method. The rhodamine B derivative was connected to the silica sphere by the grafting method. The ring structure of rhodamine B derivative was ring-opened by Hg 2+ and the fluorescence was enhanced. The fluorescence resonance Energy transfer (FRET) ratio probe, and successfully achieved the Hg ~ (2+) ratio in aqueous solution. The results show that the probe has good sensitivity and selectivity to Hg 2+ at the wavelength of 521 nm and 577 nm with a detection limit of 0.5 μM.