中国物理B ›› 2018, Vol. 27 ›› Issue (5): 56104-056104.doi: 10.1088/1674-1056/27/5/056104

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

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

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)   

  1. Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044, China
  • 收稿日期:2017-12-16 修回日期:2018-02-26 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Da-Wei He E-mail:dwhe@bjtu.edu.cn
  • 基金资助:

    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).

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

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)   

  1. Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044, China
  • Received:2017-12-16 Revised:2018-02-26 Online:2018-05-05 Published:2018-05-05
  • Contact: Da-Wei He E-mail:dwhe@bjtu.edu.cn
  • Supported by:

    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).

摘要:

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.

关键词: MoS2 quantum dots, photoluminescence, fluorescent probe

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.

Key words: MoS2 quantum dots, photoluminescence, fluorescent probe

中图分类号:  (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

  • 61.46.Df
78.55.-m (Photoluminescence, properties and materials) 87.85.fk (Biosensors)