Facile and controllable synthesis of molybdenum disulfide quantum dots for highly sensitive and selective sensing of copper ions

doi:10.1088/1674-1056/27/5/056104

Abstract

Molybdenum disulfide quantum dots (MoS₂ QDs) were synthesized via a hydrothermal method using sodium molybdate and cysteine as molybdenum and sulfur sources, respectively. The optimal hydrothermal time was studied. Furthermore, the as synthesized water-soluble MoS₂ QDs were used as a fluorescence probe for the sensitive and selective detection of copper ions. The fluorescence of the MoS₂ QDs was quenched after the addition of copper ions; the reason may be that the transfer of the excited electron from QDs to copper ions leads to the reduction of the radiative recombination. The fluorescence quenching of MoS₂ QDs is linearly dependent on the copper ions concentration ranging from 0.1 μM to 600 μM, the limit of detection is 0.098 μM, which is much lower than that of existing methods. Moreover, the MoS₂ QDs show highly selectivity towards the detection of copper ions.

Keywords: MoS₂ quantum dots photoluminescence fluorescent probe

Received: 16 December 2017
Revised: 26 February 2018
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 Key R&D Program of China (Grant No.2016YFA0202302),the National Natural Science Foundation of China (Grant Nos.61335006,61527817,and 61378073),the Overseas Expertise Introduction Center for Discipline Innovation,111 Center,China,and the National Basic Research Program of China (Grant No.KSJB17030536).

Corresponding Authors: Da-Wei He
E-mail: dwhe@bjtu.edu.cn

Cite this article:

Xue Li(李雪), Da-Wei He(何大伟), Yong-Sheng Wang(王永生), Yin Hu(胡音), Xuan Zhao(赵宣), Chen Fu(付晨), Jing-Yan Wu(吴静燕) Facile and controllable synthesis of molybdenum disulfide quantum dots for highly sensitive and selective sensing of copper ions 2018 Chin. Phys. B 27 056104

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Facile and controllable synthesis of molybdenum disulfide quantum dots for highly sensitive and selective sensing of copper ions

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