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

Journal Article · Mon Sep 01 00:00:00 EDT 2014 · APL Materials

DOI:https://doi.org/10.1063/1.4895469· OSTI ID:22303568

Lin, Zhong; Thee, Michael T.; Elías, Ana Laura; Feng, Simin; Fujisawa, Kazunori; Perea-López, Néstor; Carozo, Victor ^[1]; Zhou, Chanjing ^[2]; Terrones, Humberto ^[3]; Terrones, Mauricio ^[1]

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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)

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.

• OSTI ID: 22303568
• Journal Information: APL Materials, Vol. 2, Issue 9; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2166-532X
• Country of Publication: United States
• Language: English

Related Subjects

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