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 photoluminescence 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.
Original language | English |
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Pages (from-to) | 1308-1313 |
Number of pages | 6 |
Journal | Nanoscale |
Volume | 7 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2015 Jan 28 |
Bibliographical note
Publisher Copyright:© 2015 The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Materials Science(all)