Layer-modulated synthesis of uniform tungsten disulfide nanosheet using gas-phase precursors

Title
Layer-modulated synthesis of uniform tungsten disulfide nanosheet using gas-phase precursors
Author(s)
김수현정재훈박주상[박주상]이원선[이원선]최태진[최태진]황성환[황성환]명재민[명재민]김형준[김형준]
Keywords
SINGLE-LAYER; LARGE-AREA; GRAPHENE HETEROSTRUCTURES; MOLYBDENUM-DISULFIDE; HYDROGEN EVOLUTION; MOS2 TRANSISTORS; SIO2 SUBSTRATE; ATOMIC LAYERS; BILAYER MOS2; THIN-FILMS
Issue Date
201501
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.7, no.4, pp.1308 - 1313
Abstract
The synthesis of layered transition-metal-disulfide (MS2, M = Mo, W) nanosheets with layer controllability and large-area uniformity is an essential requirement for their application in electronic and optical devices. In this report, we describe a synthesis process of WS2 nanosheets with layer controllability and high uniformity using chemical vapor deposition (CVD) and WCl6 and H2S as gas-phase precursors. Through this process, we can systematically modulate the thickness of WS2 nanosheets by controlling the duration of the reaction between WCl6 and H2S. The CVD-grown WS2 nanosheets exhibit good stoichiometry as well as dependencies of a clear Raman shift and bandgap on the number of layers. These properties are confirmed by X-ray photoemission spectroscopy, Raman spectroscopy, and photo-luminescence measurements. The number of layers of WS2 nanosheets is confirmed by atomic force microscopy. Finally, we demonstrate the fabrication and performance of a photodetector based on a hybrid structure consisting of graphene and a WS2 nanosheet.
URI
http://hdl.handle.net/YU.REPOSITORY/33717http://dx.doi.org/10.1039/c4nr04292a
ISSN
2040-3364
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공과대학 > 신소재공학부 > Articles
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