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Chin. Phys. B, 2017, Vol. 26(6): 066102    DOI: 10.1088/1674-1056/26/6/066102
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Label-free tungsten disulfide quantum dots as a fluorescent sensing platform for highly efficient detection of copper (II) ions

Xuan Zhao(赵宣), Da-Wei He(何大伟), Yong-Sheng Wang(王永生), Yin Hu(胡音), Chen Fu(付晨), Xue Li(李雪)
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044, China
Abstract  

A fluorescent probe for the sensitive and selective determination of copper ion (Cu2+) is presented. It is based on the use of tungsten disulfide quantum dots (WS2 QDs) which is independent of the pH of solution and emits strong blue fluorescence. Copper ions could cause aggregation of the WS2 QDs and lead to fluorescence quenching of WS2 QDs. The change of fluorescence intensity is proportional to the concentration of Cu2+, and the limit of detection is 0.4 μM. The fluorescent probe is highly selective for Cu2+ over some potentially interfering ions. These results indicate that WS2 QDs, as a fluorescent sensing platform, can meet the selective requirements for biomedical and environmental application.

Keywords:  WS2 quantum dots      photoluminescence      biosensor  
Received:  12 January 2017      Revised:  23 February 2017      Accepted manuscript online: 
PACS:  61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))  
  78.55.-m (Photoluminescence, properties and materials)  
  87.85.fk (Biosensors)  
Fund: 

Project supported by the National Basic Research Program, China (Grant Nos. 2016YFA0202300 and 2016YFA0202302), the National Natural Science Foundation of China (Grant Nos. 61527817, 61335006, and 61378073), and the Beijing Municipal Science and Technology Committee, China (Grant No. Z151100003315006).

Corresponding Authors:  Da-Wei He, Yong-Sheng Wang     E-mail:  dwhe@bjtu.edu.cn;yshwang@bjtu.edu.cn

Cite this article: 

Xuan Zhao(赵宣), Da-Wei He(何大伟), Yong-Sheng Wang(王永生), Yin Hu(胡音), Chen Fu(付晨), Xue Li(李雪) Label-free tungsten disulfide quantum dots as a fluorescent sensing platform for highly efficient detection of copper (II) ions 2017 Chin. Phys. B 26 066102

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