Copper ion-induced fluorescence band shift of CdTe quantum dots: a highly specific strategy for visual detection of Cu2+ with a portable UV lamp

The Analyst ◽  
2015 ◽  
Vol 140 (23) ◽  
pp. 7859-7863 ◽  
Author(s):  
Xiaohui Lu ◽  
Yunjie Zhao ◽  
Jinjun Zhang ◽  
Xiaozhen Lu ◽  
Yucong Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visual Detection ◽  
Copper Ion ◽  
Cdte Quantum Dots ◽  
Fluorescence Band ◽  
Intensity Change ◽  
Band Shift ◽  
Specific Strategy ◽  
Cdte Qds ◽  
Uv Lamp

Visual detection of Cu2+ is realized based on a copper-induced fluorescence band shift rather than an intensity change of CdTe QDs.

scholarly journals Dual-Emission Fluorescence Probe Based on CdTe Quantum Dots and Rhodamine B for Visual Detection of Mercury and Its Logic Gate Behavior

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 713
Author(s):  
Yuefeng Gao ◽  
Sai Xu ◽  
Zhijian Liu ◽  
Kezhen Yu ◽  
Xinxiang Pan
Keyword(s):  
Quantum Dots ◽  
Rhodamine B ◽  
Visual Detection ◽  
Fluorescence Probe ◽  
Limit Of Detection ◽  
Logic Gate ◽  
Cdte Quantum Dots ◽  
Fluorescence Signal ◽  
Dual Emission ◽  
Cdte Qds

It is urgent that a convenient and sensitive technique of detecting Hg2+ be developed because of its toxicity. Conventional fluorescence analysis works with a single fluorescence probe, and it often suffers from signal fluctuations which are influenced by external factors. In this research, a novel dual-emission probe assembled through utilizing CdTe quantum dots (QDs) and rhodamine B was designed to detect Hg2+ visually. Only the emission of CdTe QDs was quenched after adding Hg2+ in the dual-emission probe, which caused an intensity ratio change of the two different emission wavelengths and hence facilitated the visual detection of Hg2+. Compared to single emission QDs-based probe, a better linear relationship was shown between the variation of fluorescence intensity and the concentration of Hg2+, and the limit of detection (LOD) was found to be11.4 nM in the range of 0–2.6 μM. Interestingly, the intensity of the probe containing Hg2+ could be recovered in presence of glutathione (GSH) due to the stronger binding affinity of Hg2+ towards GSH than that towards CdTe QDs. Based on this phenomenon, an IMPLICATION logic gate using Hg2+/GSH as inputs and the fluorescence signal of QDs as an output was constructed.

Novel “turn on–off” paper sensor based on nonionic conjugated polythiophene-coated CdTe QDs for efficient visual detection of cholinesterase activity

The Analyst ◽  
2020 ◽  
Vol 145 (12) ◽  
pp. 4305-4313 ◽  
Author(s):  
Qi Ou ◽  
Salah M. Tawfik ◽  
Xinfeng Zhang ◽  
Yong-Ill Lee
Keyword(s):  
Quantum Dots ◽  
Ache Activity ◽  
Cholinesterase Activity ◽  
Visual Detection ◽  
Color Variation ◽  
Cdte Quantum Dots ◽  
Turn On ◽  
Cdte Qds ◽  
Paper Sensor

A novel conjugated polythiophene (CP) compound was successfully combined with CdTe quantum dots to improve their selectivity and sensitivity for the efficient visual detection of AChE activity via the color variation of CdTe/CP.

A target analyte induced fluorescence band shift of piperazine modified carbon quantum dots: a specific visual detection method for oxytetracycline

2019 ◽  
Vol 55 (82) ◽  
pp. 12364-12367 ◽  
Author(s):  
Lei Yang ◽  
Haitong Zhao ◽  
Ning Liu ◽  
Wei Wang
Keyword(s):  
Quantum Dots ◽  
Visual Detection ◽  
Detection Method ◽  
Carbon Quantum Dots ◽  
Fluorescence Band ◽  
Band Shift ◽  
Specific Assay ◽  
Target Analyte

A visual and specific assay of oxytetracycline is realized by inducing a fluorescence band shift of piperazine modified carbon quantum dots.

Electrostatic repulsion strategy for highly selective and sensitive “switch–on” fluorescence sensor of ascorbic acid based on the cysteamine-coated CdTe quantum dots and cerium (IV)

2021 ◽  
Author(s):  
Yifei Guo ◽  
Jingjing Du ◽  
Jianjun Li ◽  
Ran Yang ◽  
Peter B. de Harrington ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ascorbic Acid ◽  
Hydrothermal Method ◽  
Cadmium Chloride ◽  
Fluorescence Sensor ◽  
Cdte Quantum Dots ◽  
Electrostatic Repulsion ◽  
Functional Monomer ◽  
Simple Hydrothermal Method ◽  
Cdte Qds

In this work, cysteamine-coated CdTe quantum dots (CA-CdTe QDs) were synthesized by a simple hydrothermal method employing cadmium chloride as the cadmium source and cysteamine hydrochloride as the functional monomer....

A simple paper-based approach for arsenic determination in water using hydride generation coupled with mercaptosuccinic-acid capped CdTe quantum dots

2020 ◽  
Vol 12 (21) ◽  
pp. 2718-2726
Author(s):  
Oraphan Thepmanee ◽  
Kanlaya Prapainop ◽  
Obnithi Noppha ◽  
Nuanlaor Rattanawimanwong ◽  
Weena Siangproh ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydride Generation ◽  
Cdte Quantum Dots ◽  
Mercaptosuccinic Acid ◽  
Cdte Qds ◽  
Arsenic Detection ◽  
Detection Probe ◽  
Arsenic Determination

Paper-based device with MSA-CdTe QDs as arsenic detection probe is presented.

scholarly journals Silver ion-doped CdTe quantum dots as fluorescent probe for Hg2+ detection

RSC Advances ◽  
2020 ◽  
Vol 10 (64) ◽  
pp. 38965-38973
Author(s):  
Huazheng Li ◽  
Wangwei Lu ◽  
Gaoling Zhao ◽  
Bin Song ◽  
Jing Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Probe ◽  
Fluorescence Intensity ◽  
Silver Ion ◽  
Cdte Quantum Dots ◽  
Detection Range ◽  
Cdte Qds ◽  
Linear Relationships ◽  
The Relationship

Ag-doped CdTe QDs emit multiple-fluorescence peaks, and the relationship between fluorescence intensity and the concentration of Hg2+ is established. Two linear relationships are obtained, which is benefit to the extension of detection range.

Fluorescence suppression of MPA stabilized CdTe QDs for direct determination of propranolol

2017 ◽  
Vol 9 (6) ◽  
pp. 929-936 ◽  
Author(s):  
Fan Zhang ◽  
Miaomiao Chen ◽  
Haiqing Zhang ◽  
Huayu Xiong ◽  
Wei Wen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescent Sensor ◽  
Direct Determination ◽  
Cdte Quantum Dots ◽  
Mercaptopropionic Acid ◽  
Cdte Qds

A sensitive, convenient and rapid fluorescent sensor for effectively and directly detecting propranolol was proposed based on the fluorescence suppression of 3-mercaptopropionic acid stabilized CdTe quantum dots.

CdTe quantum dots@luminol for trace-level chemiluminescence sensing of phenacetin based on biological recognition materials

2016 ◽  
Vol 40 (1) ◽  
pp. 458-463 ◽  
Author(s):  
Huimin Duan ◽  
Leilei Li ◽  
Xiaojiao Wang ◽  
Yanhui Wang ◽  
Jianbo Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdte Quantum Dots ◽  
Trace Level ◽  
Cdte Qds ◽  
Biological Recognition

The CL signal was amplified by CRET in CdTe QDs@luminol to improve the sensitivity and CsMG-MIP was introduced to improve the selectivity.

Turn-on fluorescent cyanide sensor based on copper ion-modified CdTe quantum dots

The Analyst ◽  
2009 ◽  
Vol 134 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Li Shang ◽  
Lihua Zhang ◽  
Shaojun Dong
Keyword(s):  
Quantum Dots ◽  
Copper Ion ◽  
Cdte Quantum Dots ◽  
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