Manipulating time-dependent size distribution of sulfur quantum dots and their fluorescence sensing for ascorbic acid,Dalton Transactions

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Manipulating time-dependent size distribution of sulfur quantum dots and their fluorescence sensing for ascorbic acid
Dalton Transactions ( IF 3.5 ) Pub Date : 2022-06-15 , DOI: 10.1039/d2dt01584f
Zitong Wei ₁ , Wenyi Lu ₁ , Caiwen Pan ₁ , Jiping Ni ₁ , Haiyun Zhao ₂ , Guoyong Huang ₁ , Chunxia Wang ₁

Affiliation

Unlike the previous commonly used strong alkaline solvent sodium hydroxide, we employ an eco-friendly solvent, ethanol, as a solvent for the preparation of ultra-small-sized sulfur quantum dots (SQDs). Ethanol can disperse bulk sulfur and allow sufficient transfer of large-sized sulfur to smaller-sized SQDs through a one-pot synthesis approach. The SQDs obtained from ethanol as the solvent displays superior photoluminescence properties to those in water and sodium hydroxide. By delicately controlling the reaction conditions, including the amount of bulk sulfur, the reaction time, and the proportion of sulfur to oxidizing reagent, highly blue emissive SQDs with a photoluminescence quantum yield (PLQY) of 7.04% with ultra-high stability for several months can be successfully prepared. Furthermore, we found out that the SQDs display a dynamic photoluminescence properties and varied particle sizes as the reaction time increases, which is possibly realized via the etching-aggregation process. Morevoer, the fluorescence of SQDs-72 can be effectively quenched by CoOOH nanosheets and recovered upon addition of ascorbic acid (AA) by consuming CoOOH nanosheets through the redox reaction, leading to fluorescence recovery. Therefore, a fluorescence “off–on” nanosensor for the detection of AA with a limit of detection (LOD) of 0.85 μM was constructed.

中文翻译：

操纵硫量子点的时间依赖性尺寸分布及其对抗坏血酸的荧光传感

与以往常用的强碱性溶剂氢氧化钠不同，我们采用环保溶剂乙醇作为制备超小型硫量子点（SQD）的溶剂。乙醇可以分散大量硫磺，并允许通过一锅法合成方法将大尺寸硫充分转移到较小尺寸的 SQD。从乙醇作为溶剂获得的 SQD 表现出优于水和氢氧化钠的光致发光特性。通过精细控制反应条件，包括体硫的量、反应时间以及硫与氧化剂的比例，具有 7.04% 的光致发光量子产率 (PLQY) 的高蓝光 SQD 具有数月的超高稳定性可以成功准备。此外，通过蚀刻聚合过程。此外，SQDs-72 的荧光可以被 CoOOH 纳米片有效地淬灭，并在添加抗坏血酸 (AA) 后通过氧化还原反应消耗 CoOOH 纳米片而恢复，从而导致荧光恢复。因此，构建了一种用于检测 AA 的荧光“关-开”纳米传感器，其检测限 (LOD) 为 0.85 μM。

更新日期：2022-06-15

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