高荧光效率硫量子点的简单制备及其在对硝基苯酚检测中的应用

黄铮钰; 黄泽明; 周立

doi:10.37188/CJL.20220073

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高荧光效率硫量子点的简单制备及其在对硝基苯酚检测中的应用

发光学应用及交叉前沿 | 更新时间：2022-10-19

- 高荧光效率硫量子点的简单制备及其在对硝基苯酚检测中的应用
  增强出版
- Facile Synthesis of Highly Fluorescent Sulfur Quantum Dots for Detection of 4-Nitrophenol
- 发光学报 2022年43卷第6期页码：952-960
- 作者机构：
  
  桂林理工大学材料科学与工程学院，广西桂林　541004
- 作者简介：
  
  [ "黄铮钰（1996-），女，四川眉山人，硕士研究生，2019年于桂林理工大学获得学士学位，主要从事纳米材料的研究。Email: Huangzhengyu0304@163. com" ]
  [ "周立（1983-），男，湖南益阳人，博士，教授，博士生导师，2010 年于湖南大学获得博士学位，主要从事纳米材料与天然多糖的研究。Email: zhouli@glut. edu. cn" ]
- 基金信息：
  
  国家自然科学基金(U21A2097);广西自然科学基金(2017GXNSFFA198002);广西八桂学者计划资助项目
- DOI：10.37188/CJL.20220073
  中图分类号： O482.31
- 纸质出版日期：2022-06-05，
  
  收稿日期：2022-03-05，
  
  修回日期：2022-03-25，
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黄铮钰,黄泽明,周立.高荧光效率硫量子点的简单制备及其在对硝基苯酚检测中的应用[J].发光学报,2022,43(06):952-960.

HUANG Zheng-yu,HUANG Ze-ming,ZHOU Li.Facile Synthesis of Highly Fluorescent Sulfur Quantum Dots for Detection of 4-Nitrophenol[J].Chinese Journal of Luminescence,2022,43(06):952-960.
黄铮钰,黄泽明,周立.高荧光效率硫量子点的简单制备及其在对硝基苯酚检测中的应用[J].发光学报,2022,43(06):952-960. DOI： 10.37188/CJL.20220073.

HUANG Zheng-yu,HUANG Ze-ming,ZHOU Li.Facile Synthesis of Highly Fluorescent Sulfur Quantum Dots for Detection of 4-Nitrophenol[J].Chinese Journal of Luminescence,2022,43(06):952-960. DOI： 10.37188/CJL.20220073.

摘要

以单质硫⁃乙二胺混合液作为前驱体，采用简单的一步溶剂热法制备了高荧光效率的硫量子点（SQDs）。制得的SQDs具有优异的水溶性，其粒径范围为1.6~3.8 nm，呈现近单分散尺寸分布。SQDs的发射峰不随激发波长的改变而变化，当激发波长为340 nm时其显示出最强的荧光，荧光量子产率可达87%。同时，该SQDs还具有良好的荧光稳定性，改变溶液的pH或室温静置1个月，其荧光强度都没有明显降低。进一步的性能研究发现，该SQDs可以作为一种高灵敏度和高选择性的荧光探针来检测对硝基苯酚（4⁃NP），这是由于4⁃NP与SQDs之间存在内滤效应，4⁃NP能够有效猝灭SQDs的荧光。当4⁃NP浓度在2~85 μmol/L 范围内时，SQDs的相对荧光强度（

I/I

）与4⁃NP的浓度呈现良好的线性关系，检测限达到了73.4 nmol/L。真实水样检测结果也证实该SQDs可以有效检测环境中的4⁃NP。

Abstract

As a new class of metal-free fluorescent nanomaterials， sulfur quantum dots（SQDs） have attracted increasing attention because of their unique composition， excellent optical properties and low toxicity. However， the SQDs usually suffer from the drawbacks of low fluorescence quantum yield（QY） and long preparation time， which significantly limit the practical application of SQDs. In this paper， we report a simple and viable method to prepare SQDs with high QY based on the one-step solvothermal treatment of elemental sulfur-ethylenediamine（EDA） precursor at 175 ℃ for 4 h. The prepared SQDs exhibited excellent water solubility and nearly monodisperse size distribution with size in the range of 1.6-3.8 nm. Different from other reported SQDs， the obtained SQDs showed excitation-independent emission behavior. The emission peak of the SQDs did not change with the variation of excitation wavelength. The maximum emission intensity was achieved when the excitation wavelength was 340 nm. Moreover， the fluorescence QY of SQDs was determined to be as high as 87%， which is much higher than other reported SQDs. The SQDs also displayed good fluorescence stability. When the solution pH was changed in the range of 4-9 or the SQDs solution was stored at room temperature for one month， the fluorescence intensity of SQDs did not change significantly. Furthermore， the SQDs can be used as an effective fluorescent probe for highly sensitive and selective detection of 4-nitrophenol（4-NP）. Owing to the presence of inner filter effect， the 4-NP can effectively quench the fluorescence of SQDs. When the concentration of 4-NP was in the range of 2-85 μmol/L， there was a good linear relationship between the relative fluorescence intensity（

I/I

） of SQDs and the concentration of 4-NP. The limit of detection was calculated to be as low as 73.4 nmol/L. In addition， the SQDs were also successfully employed to sense 4-NP in tap water and river water with satisfactory performance.

关键词

硫量子点荧光探针检测对硝基苯酚内滤效应

Keywords

sulfur quantum dotsfluorescent probedetection4-nitrophenolinner filter effect

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