Issue 4, 2015

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
28 Jul 2014
Accepted
13 Oct 2014
First published
14 Oct 2014

Nanoscale, 2015,7, 1308-1313

Author version available

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

J. Park, W. Lee, T. Choi, S. Hwang, J. M. Myoung, J. Jung, S. Kim and H. Kim, Nanoscale, 2015, 7, 1308 DOI: 10.1039/C4NR04292A

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