比率型荧光纸基传感器基于 CdTe 量子点和石墨相氮化碳杂化用于饮料中 Cu 的可视化和快速测定。

Ratiometric Fluorescent Paper-Based Sensor Based on CdTe Quantum Dots and Graphite Carbon Nitride Hybrid for Visual and Rapid Determination of Cu in Drinks.

机构信息

Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, Institute for Advanced Materials, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi, 435002, China.

出版信息

Photochem Photobiol. 2020 Sep;96(5):1154-1160. doi: 10.1111/php.13271. Epub 2020 May 19.

DOI:10.1111/php.13271

PMID:32242937

Abstract

A simple and effective ratiometric fluorescence sensor of CdTe QDs/GCNNs for on-site and rapid analysis of Cu has been established by mixing physically CdTe QDs and graphite carbon nitride (GCNNs). Two emissions peaks of CdTe QDs at 572 nm and GCNNs at 436 nm are both excitated at 340 nm. Under a UV lamp, fluorescent of traffic yellow CdTe QDs is linearly quenched by Cu (as the detection signal), while blue GCNNs remains unchanged (as the reference), resulting in a distinguishable color change gradually from pink yellow to blue. The limit of detection (LOD) of this new sensor for Cu is as low as 0.47 ng mL with 1.4 % RSD. The established method has been successfully applied to detection of Cu in various drinks with satisfactory results. Moreover, a paper-based sensor, which has been prepared by soaking cellulose acetate membrane in CdTe QDs/GCNNs sensor solution, has a wide semiquantitative detection range for Cu (0.01 ~ 5.0 μg mL ). It has realized successfully on-site and rapid determination of Cu in red wine without any pretreatment procedure and is of great promotion and application value in determination of Cu in liquid samples.

摘要

通过将碲化镉量子点（CdTe QDs）与石墨相氮化碳（GCNNs）物理混合，建立了一种用于现场快速分析 Cu 的简单有效的比率荧光传感器 CdTe QDs/GCNNs。CdTe QDs 的两个发射峰分别位于 572nm 和 GCNNs 的 436nm，均在 340nm 激发。在紫外灯下，交通黄 CdTe QDs 的荧光被 Cu 线性猝灭（作为检测信号），而蓝色的 GCNNs 保持不变（作为参考），导致颜色从粉红色逐渐变为蓝色，可明显区分。该新型传感器对 Cu 的检测限（LOD）低至 0.47ng·mL，相对标准偏差（RSD）为 1.4%。该方法已成功应用于各种饮料中 Cu 的检测，结果令人满意。此外，通过将醋酸纤维素膜浸泡在 CdTe QDs/GCNNs 传感器溶液中制备的基于纸的传感器，对 Cu 具有较宽的半定量检测范围（0.01~5.0μg·mL）。它成功地实现了红酒中 Cu 的现场快速测定，无需任何预处理步骤，在液体样品中 Cu 的测定方面具有很大的推广和应用价值。