Citation: SUN Wei-Yi, LI Pan, TAO Zhan-Liang, CHEN Jun. Size-Controlled MoS₂ Nanodots for Luminescent Property[J]. Chinese Journal of Inorganic Chemistry, ;2017, 33(5): 796-800. doi: 10.11862/CJIC.2017.111 shu

Size-Controlled MoS₂ Nanodots for Luminescent Property

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China

Corresponding author: TAO Zhan-Liang, taozhl@nankai.edu.cn
Received Date: 23 December 2016
Revised Date: 6 March 2017

Figures(4)

Molybdenum disulfide, which is composed of a monolayer or few layers, is a new kind of two-dimensional materials following the study of grapheme. It is a kind of direct band-gap semiconductor with excellent photoelectric properties, which has attracted much attention. In this paper, molybdenum disulfide with different particle size was successfully prepared by heat-up method. The MoCl₅ was reacted with L-cysteine in the presence of oleylamine at 220℃, and we performed different reaction time from 1 to 5 h to understand the formation mechanism. There are two mechanisms occurred in the formation process of MoS₂ nanodots:one is the Ostwald ripening and the other is an epitaxial growth. Until there are no enough nuclei for growth, the size remains unchanged regardless of the growth of the time. The prepared MoS₂ nanodots are homogeneous in the aspects of size and height from the large range due to the protection of OLA. In addition, OLA providing a strong reductive environment reduces Mo⁵⁺ to Mo⁴⁺ and avoids oxidation of the nanoparticles, which integrated with L-cysteine to results in the formation of H₂S. The molybdenum disulfide quantum dots prepared for 3 h had monolayer structure. We also investigate the photoluminescence behaviors of the materials to inquire the size effect. The fluorescence spectra and Raman spectra of three kinds of molybdenum disulfides were studied. It was found that when the particle size or the excitation wavelength increased, the peak position of the fluorescence spectrum occurred red shift.
- molybdenum disulfide,
- nanodots,
- heat-up method,
- luminescent,
- size effect
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Size-Controlled MoS₂ Nanodots for Luminescent Property