Laser THz Emission Spectroscopy of Gas Adsorption-Desorption Dynamics in Tungsten Disulfide Nanosheets

• Renee Bagsican Filchito

  Institute of Laser Engineering, Osaka University

• Kawayama Iwao

  Institute of Laser Engineering, Osaka University

• Murakami Hironaru

  Institute of Laser Engineering, Osaka University

• Tonouchi Masayoshi

  Institute of Laser Engineering, Osaka University

• Winchester Andrew

  Department of Physics, Southern Illinois University-Carbondale

• Ghosh Sujoy

  Department of Physics, Southern Illinois University-Carbondale

• Talapatra Saikat

  Department of Physics, Southern Illinois University-Carbondale

抄録

Physically adsorbed gas molecules have dramatic effects on the inherent properties of 2D nanomaterials due to their atomic/molecular-level thinness. In this work, we applied laser THz emission spectroscopy to study the gas adsorption-desorption dynamics of tungsten disulfide (WS₂) nanosheets prepared by liquid phase exfoliation technique. We find that in low vacuum conditions, NIR irradiation promotes desorption of O₂ molecules from WS₂ nanosheets. Upon exposure to atmospheric air, results suggest slight photo-oxidation caused by NIR irradiation. Strong photo-oxidation by UV illumination is also confirmed, and we also observed subsequent O₂ desorption from WS₂ nanosheets by NIR irradiation when the UV illumination is turned off. These results are discussed using the Langmuir adsorption isotherm, which explains the variation of gas adsorption with the gas pressure. [DOI: 10.1380/ejssnt.2015.78]

収録刊行物

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 14 (0), 78-82, 2016

  公益社団法人 日本表面真空学会

キーワード

• Physical adsorption
• Indium phosphide
• Tungsten disulfide
• Liquid phase exfoliation
• Laser THz emission spectroscopy

詳細情報

• CRID: 1390001205185508864
• NII論文ID: 130005138180
• DOI: 10.1380/ejssnt.2016.78
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/14/0/14_78/_pdf
• 本文言語コード: en
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