Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry, South China Normal University, Guangzhou 510006, China.
Guangzhou Key Laboratory of Analytical Chemistry for Biomedicine, School of Chemistry, South China Normal University, Guangzhou 510006, China.
Inorg Chem. 2022 Mar 7;61(9):4159-4170. doi: 10.1021/acs.inorgchem.1c04024. Epub 2022 Feb 21.
In this work, three different sulfur sources such as sulfur powder, sodium sulfide, and sodium thiosulfate are selected to prepare sulfur-derived quantum dots (S-QDs), NaS-derived nanoparticles (NS-NPs), and NaSO-derived QDs (NSO-QDs) in the presence of NaOH or assisted by hydrogen peroxide etching. The low sulfur percentage in the above three samples and the synthesis experiments in the presence of nitrogen/oxygen all support that poly(ethylene glycol) (PEG) plays an important role during the assembly process and the definition of sulfur dots is not accurate. For photophysical features, remarkable green quantum dots (S-QDs) possess an excitation-independent emission peak at 500 nm. But NS-NPs and NSO-QDs demonstrate observable shift tendency, and the evolution of emission profiles varies from 480 to 586 nm. NSO-QDs can be used as a fluorescent probe for highly selective and quantitative detection of Ni in an aqueous solution in the presence of potential interfering ions with a low detection limit (0.18 μM) and a wide linear range (8-380 μM). Their reusability performance has also been demonstrated by employing dimethylglyoxime as the restoration reagent.
在这项工作中，选择了三种不同的硫源，如硫粉、硫化钠和硫代硫酸钠，在 NaOH 的存在下或在过氧化氢刻蚀的辅助下制备了硫衍生的量子点 (S-QDs)、NaS 衍生的纳米粒子 (NS-NPs) 和 NaSO 衍生的 QDs (NSO-QDs)。上述三种样品中硫的百分比较低，以及在氮气/氧气存在下的合成实验都表明聚乙二醇 (PEG) 在组装过程中起着重要作用，并且硫点的定义并不准确。对于光物理特性，显著的绿色量子点 (S-QDs) 在 500nm 处具有激发独立的发射峰。然而，NS-NPs 和 NSO-QDs 表现出可观察到的偏移趋势，发射谱的演变从 480nm 到 586nm 不等。NSO-QDs 可用作荧光探针，用于在存在潜在干扰离子的情况下，在水溶液中对 Ni 进行高选择性和定量检测，检测限低至 0.18μM，线性范围宽至 8-380μM。通过使用二甲基乙二肟作为恢复试剂，还证明了它们的可重复使用性能。
