Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide

Abstract Adsorption of gas molecules on the surface of atomically layered two-dimensional (2D) materials, including graphene and transition metal dichalcogenides, can significantly affect their electrical and optical properties. Therefore, a microscopic and quantitative understanding of the mechanis...

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Autores principales:	Filchito Renee Bagsican, Andrew Winchester, Sujoy Ghosh, Xiang Zhang, Lulu Ma, Minjie Wang, Hironaru Murakami, Saikat Talapatra, Robert Vajtai, Pulickel M. Ajayan, Junichiro Kono, Masayoshi Tonouchi, Iwao Kawayama
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f6007d7acdbf405f80f67aec17fff659
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spelling	oai:doaj.org-article:f6007d7acdbf405f80f67aec17fff6592021-12-02T15:05:06ZAdsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide10.1038/s41598-017-01883-12045-2322https://doaj.org/article/f6007d7acdbf405f80f67aec17fff6592017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01883-1https://doaj.org/toc/2045-2322Abstract Adsorption of gas molecules on the surface of atomically layered two-dimensional (2D) materials, including graphene and transition metal dichalcogenides, can significantly affect their electrical and optical properties. Therefore, a microscopic and quantitative understanding of the mechanism and dynamics of molecular adsorption and desorption has to be achieved in order to advance device applications based on these materials. However, recent theoretical calculations have yielded contradictory results, particularly on the magnitude of the adsorption energy. Here, we have experimentally determined the adsorption energy of oxygen molecules on graphene and 2D tungsten disulfide using temperature-programmed terahertz (THz) emission microscopy (TPTEM). The temperature dependence of THz emission from InP surfaces covered with 2D materials reflects the change in oxygen concentration due to thermal desorption, which we used to estimate the adsorption energy of oxygen molecules on graphene (~0.15 eV) and tungsten disulphide (~0.24 eV). Furthermore, we used TPTEM to visualize relative changes in the spatial distribution of oxygen molecules on monolayer graphene during adsorption and desorption. Our results provide much insight into the mechanism of molecular adsorption on the surface of 2D materials, while introducing TPTEM as a novel and powerful tool for molecular surface science.Filchito Renee BagsicanAndrew WinchesterSujoy GhoshXiang ZhangLulu MaMinjie WangHironaru MurakamiSaikat TalapatraRobert VajtaiPulickel M. AjayanJunichiro KonoMasayoshi TonouchiIwao KawayamaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Filchito Renee Bagsican Andrew Winchester Sujoy Ghosh Xiang Zhang Lulu Ma Minjie Wang Hironaru Murakami Saikat Talapatra Robert Vajtai Pulickel M. Ajayan Junichiro Kono Masayoshi Tonouchi Iwao Kawayama Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
description	Abstract Adsorption of gas molecules on the surface of atomically layered two-dimensional (2D) materials, including graphene and transition metal dichalcogenides, can significantly affect their electrical and optical properties. Therefore, a microscopic and quantitative understanding of the mechanism and dynamics of molecular adsorption and desorption has to be achieved in order to advance device applications based on these materials. However, recent theoretical calculations have yielded contradictory results, particularly on the magnitude of the adsorption energy. Here, we have experimentally determined the adsorption energy of oxygen molecules on graphene and 2D tungsten disulfide using temperature-programmed terahertz (THz) emission microscopy (TPTEM). The temperature dependence of THz emission from InP surfaces covered with 2D materials reflects the change in oxygen concentration due to thermal desorption, which we used to estimate the adsorption energy of oxygen molecules on graphene (~0.15 eV) and tungsten disulphide (~0.24 eV). Furthermore, we used TPTEM to visualize relative changes in the spatial distribution of oxygen molecules on monolayer graphene during adsorption and desorption. Our results provide much insight into the mechanism of molecular adsorption on the surface of 2D materials, while introducing TPTEM as a novel and powerful tool for molecular surface science.
format	article
author	Filchito Renee Bagsican Andrew Winchester Sujoy Ghosh Xiang Zhang Lulu Ma Minjie Wang Hironaru Murakami Saikat Talapatra Robert Vajtai Pulickel M. Ajayan Junichiro Kono Masayoshi Tonouchi Iwao Kawayama
author_facet	Filchito Renee Bagsican Andrew Winchester Sujoy Ghosh Xiang Zhang Lulu Ma Minjie Wang Hironaru Murakami Saikat Talapatra Robert Vajtai Pulickel M. Ajayan Junichiro Kono Masayoshi Tonouchi Iwao Kawayama
author_sort	Filchito Renee Bagsican
title	Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
title_short	Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
title_full	Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
title_fullStr	Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
title_full_unstemmed	Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
title_sort	adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f6007d7acdbf405f80f67aec17fff659
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Adsorption energy of oxygen molecules on graphene and two-dimensional tungsten disulfide

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