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

Jusang Park, Wonseon Lee, Taejin Choi, Sung Hwan Hwang, Jae Min Myoung, Jae Hoon Jung, Soo Hyun Kim, Hyungjun Kim

Research output: Contribution to journalArticle

51 Citations (Scopus)

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 languageEnglish
Pages (from-to)1308-1313
Number of pages6
JournalNanoscale
Volume7
Issue number4
DOIs
Publication statusPublished - 2015 Jan 28

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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