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Ratiometric fluorescent paper-based sensor based on CdTe quantum dots and graphite carbon nitride hybrid for visual and rapid determination of Cu2+ in drinks
Photochemistry and Photobiology ( IF 2.6 ) Pub Date : 2020-05-19 , DOI: 10.1111/php.13271
Kaili He 1 , Xin Zhan 1 , Lian Liu 1 , Xiaohong Ruan 1 , Yiwei Wu 1
Affiliation  

A simple and effective ratiometric fluorescence sensor of CdTe QDs/GCNNs for on‐site and rapid analysis of Cu2+ 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 Cu2+ (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 Cu2+ is as low as 0.47 ng mL−1 with 1.4 % RSD. The established method has been successfully applied to detection of Cu2+ 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 Cu2+ (0.01 ~ 5.0 μg mL−1). It has realized successfully on‐site and rapid determination of Cu2+ in red wine without any pretreatment procedure and is of great promotion and application value in determination of Cu2+ in liquid samples.

中文翻译:

基于 CdTe 量子点和石墨氮化碳混合物的比例荧光纸基传感器用于视觉和快速测定饮料中的 Cu2+

通过物理混合 CdTe QDs 和石墨碳氮化物 (GCNNs),建立了一种简单有效的 CdTe QDs/GCNNs 比率荧光传感器,用于现场和快速分析 Cu2+。CdTe QD 在 572 nm 和 GCNN 在 436 nm 的两个发射峰都在 340 nm 激发。在紫外灯下,交通黄 CdTe QDs 的荧光被 Cu2+(作为检测信号)线性淬灭,而蓝色 GCNNs 保持不变(作为参考),导致可区分的颜色从粉红色逐渐变为蓝色。这种新型 Cu2+ 传感器的检测限 (LOD) 低至 0.47 ng mL-1,RSD 为 1.4 %。所建立的方法已成功应用于各种饮料中Cu2+的检测,结果令人满意。此外,纸基传感器,通过将醋酸纤维素膜浸泡在 CdTe QDs/GCNNs 传感器溶液中制备,对 Cu2+ 具有较宽的半定量检测范围(0.01 ~ 5.0 μg mL−1)。成功实现了原位快速测定红酒中Cu2+,无需任何前处理,对液体样品中Cu2+的测定具有重要的推广应用价值。
更新日期:2020-05-19
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