Laser THz emission spectroscopy of gas adsorption-desorption dynamics in tungsten disulfide nanosheets

Filchito Renee Bagsican; Iwao Kawayama; Hironaru Murakami; Masayoshi Tonouchi; Andrew Winchester; Sujoy Ghosh; Saikat Talapatra

doi:10.1380/ejssnt.2015.78

Laser THz emission spectroscopy of gas adsorption-desorption dynamics in tungsten disulfide nanosheets

Filchito Renee Bagsican, Iwao Kawayama, Hironaru Murakami, Masayoshi Tonouchi, Andrew Winchester, Sujoy Ghosh, Saikat Talapatra

Nanofabrication Research Laboratory

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	78-82
Number of pages	5
Journal	e-Journal of Surface Science and Nanotechnology
Volume	14
DOIs	https://doi.org/10.1380/ejssnt.2015.78
State	Published - Mar 19 2016

Funding

This work is partially funded by Grant-in-Aid for Scientific Research (No. 25630149 and No. 26107524), JSPS/MEXT, Air Force Office of Scientific Research (grant number FA9550-14-1-0268 and FA2386-15-1-0004), and Program for Promoting International Joint Research, Osaka University.

Keywords

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

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title = "Laser THz emission spectroscopy of gas adsorption-desorption dynamics in tungsten disulfide nanosheets",

abstract = "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.",

keywords = "Indium phosphide, Laser THz emission spectroscopy, Liquid phase exfoliation, Physical adsorption, Tungsten disulfide",

author = "Bagsican, {Filchito Renee} and Iwao Kawayama and Hironaru Murakami and Masayoshi Tonouchi and Andrew Winchester and Sujoy Ghosh and Saikat Talapatra",

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T1 - Laser THz emission spectroscopy of gas adsorption-desorption dynamics in tungsten disulfide nanosheets

AU - Bagsican, Filchito Renee

AU - Kawayama, Iwao

AU - Murakami, Hironaru

AU - Tonouchi, Masayoshi

AU - Winchester, Andrew

AU - Ghosh, Sujoy

AU - Talapatra, Saikat

PY - 2016/3/19

Y1 - 2016/3/19

N2 - 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.

AB - 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.

KW - Indium phosphide

KW - Laser THz emission spectroscopy

KW - Liquid phase exfoliation

KW - Physical adsorption

KW - Tungsten disulfide

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ER -

Laser THz emission spectroscopy of gas adsorption-desorption dynamics in tungsten disulfide nanosheets

Abstract

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Keywords

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