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Title: Facile synthesis of MoS{sub 2} and Mo{sub x}W{sub 1-x}S{sub 2} triangular monolayers

Single- and few-layered transition metal dichalcogenides, such as MoS{sub 2} and WS{sub 2}, are emerging two-dimensional materials exhibiting numerous and unusual physico-chemical properties that could be advantageous in the fabrication of unprecedented optoelectronic devices. Here we report a novel and alternative route to synthesize triangular monocrystals of MoS{sub 2} and Mo{sub x}W{sub 1-x}S{sub 2} by annealing MoS{sub 2} and MoS{sub 2}/WO{sub 3} precursors, respectively, in the presence of sulfur vapor. In particular, the Mo{sub x}W{sub 1-x}S{sub 2} triangular monolayers show gradual concentration profiles of W and Mo whereby Mo concentrates in the islands’ center and W is more abundant on the outskirts of the triangular monocrystals. These observations were confirmed by atomic force microscopy, and high-resolution transmission electron microscopy, as well as Raman and photoluminescence spectroscopy. The presence of tunable PL signals depending on the Mo{sub x}W{sub 1-x}S{sub 2} stoichiometries in 2D monocrystals opens up a wide range of applications in electronics and optoelectronics.
Authors:
; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [4]
  1. Department of Physics and Center for 2Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  3. Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 122180 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22303568
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 2; Journal Issue: 9; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANNEALING; ATOMIC FORCE MICROSCOPY; CHEMICAL PROPERTIES; FABRICATION; MOLYBDENUM SULFIDES; MONOCRYSTALS; PHOTOLUMINESCENCE; SPECTROSCOPY; SULFUR; SYNTHESIS; TRANSITION ELEMENTS; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTATES; TUNGSTEN OXIDES; TUNGSTEN SULFIDES