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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 Cu 2+ in Drinks
Author(s) -
He Kaili,
Zhan Xin,
Liu Lian,
Ruan Xiaohong,
Wu Yiwei
Publication year - 2020
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.13271
Subject(s) - cadmium telluride photovoltaics , detection limit , fluorescence , graphite , carbon nitride , quantum dot , analytical chemistry (journal) , materials science , carbon fibers , chemistry , optoelectronics , chromatography , photocatalysis , optics , metallurgy , composite number , composite material , catalysis , biochemistry , physics
A simple and effective ratiometric fluorescence sensor of CdTe QDs/GCNNs for on‐site and rapid analysis of Cu 2+ 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 2+ (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 2+ is as low as 0.47 ng mL −1 with 1.4 % RSD. The established method has been successfully applied to detection of Cu 2+ 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 2+ (0.01 ~ 5.0 μg mL −1 ). It has realized successfully on‐site and rapid determination of Cu 2+ in red wine without any pretreatment procedure and is of great promotion and application value in determination of Cu 2+ in liquid samples.