配体封端的 CdTe 量子点作为荧光纳米传感器用于环境水样中铜离子的检测。

Ligand-Capped CdTe Quantum Dots as a Fluorescent Nanosensor for Detection of Copper Ions in Environmental Water Sample.

机构信息

Department of Chemistry, Faculty of Science, Imam Khomeini International University (IKIU), PO BOX 288, Qazvin, Iran.

Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran.

出版信息

J Fluoresc. 2017 Nov;27(6):2323-2333. doi: 10.1007/s10895-017-2174-3. Epub 2017 Sep 21.

DOI:10.1007/s10895-017-2174-3

PMID:28936785

Abstract

In this work, as a novel fluorescent nano-sensor, a ligand-capped CdTe QDs (CdTe-L QDs) was designed for the detection and quantification of Cu ions in environmental water samples. The synthesized QDs were characterized by transmission electron microscopy (TEM), thermo-gravimetric (TG) analysis, Fourier transform infrared (FTIR), UV-Vis spectrophotometry and fluorescence spectroscopy. Optical properties of the produced nanosensor were monitored by UV-Vis and fluorescence spectrophotometry. It was observed that fluorescence intensity of the produced nano-sensor selectively quenched by adding Cu ions in comparison to other metal ions tested. Using CdTe-L QDs, a rapid and facile analytical method was developed to determine Cu ions in the concentration range of 5.16 ± 0.07 × 10 mol L-1.50 ± 0.03 × 10 mol L with a detection limit of 1.55 ± 0.05 × 10 mol L. The nanosensor was successfully applied for the determination of Cu ions in various water samples, and the results were compared with the standard method. Graphical Abstract.

摘要

在这项工作中，我们设计了一种配体封端的 CdTe QDs（CdTe-L QDs）作为新型荧光纳米传感器，用于检测和定量环境水样中的 Cu 离子。合成的 QDs 通过透射电子显微镜（TEM）、热重（TG）分析、傅里叶变换红外（FTIR）、紫外-可见分光光度法和荧光光谱法进行了表征。通过紫外-可见和荧光分光光度法监测所产生纳米传感器的光学性质。观察到与其他测试的金属离子相比，所产生的纳米传感器的荧光强度通过加入 Cu 离子而选择性猝灭。使用 CdTe-L QDs，开发了一种快速简便的分析方法，用于在 5.16 ± 0.07 × 10-5 mol L-1 至 50 ± 0.03 × 10-5 mol L-1 的浓度范围内测定 Cu 离子，检测限为 1.55 ± 0.05 × 10-5 mol L。该纳米传感器成功应用于各种水样中 Cu 离子的测定，并将结果与标准方法进行了比较。