Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy

Abstract The processes governing multilayer nucleation in the chemical vapour deposition (CVD) of graphene are important for obtaining high-quality monolayer sheets, but remain poorly understood. Here we show that higher-order carbon species in the gas-phase play a major role in multilayer nucleatio...

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Autores principales:	Abhay Shivayogimath, David Mackenzie, Birong Luo, Ole Hansen, Peter Bøggild, Timothy J. Booth
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b8d80fb70b0b4c47873c3e87a694f275
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spelling	oai:doaj.org-article:b8d80fb70b0b4c47873c3e87a694f2752021-12-02T15:05:23ZProbing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy10.1038/s41598-017-06276-y2045-2322https://doaj.org/article/b8d80fb70b0b4c47873c3e87a694f2752017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06276-yhttps://doaj.org/toc/2045-2322Abstract The processes governing multilayer nucleation in the chemical vapour deposition (CVD) of graphene are important for obtaining high-quality monolayer sheets, but remain poorly understood. Here we show that higher-order carbon species in the gas-phase play a major role in multilayer nucleation, through the use of in-situ ultraviolet (UV) absorption spectroscopy. These species are the volatilized products of reactions between hydrogen and carbon contaminants that have backstreamed into the reaction chamber from downstream system components. Consequently, we observe a dramatic suppression of multilayer nucleation when backstreaming is suppressed. These results point to an important and previously undescribed mechanism for multilayer nucleation, wherein higher-order gas-phase carbon species play an integral role. Our work highlights the importance of gas-phase dynamics in understanding the overall mechanism of graphene growth.Abhay ShivayogimathDavid MackenzieBirong LuoOle HansenPeter BøggildTimothy J. BoothNature 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 Abhay Shivayogimath David Mackenzie Birong Luo Ole Hansen Peter Bøggild Timothy J. Booth Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy
description	Abstract The processes governing multilayer nucleation in the chemical vapour deposition (CVD) of graphene are important for obtaining high-quality monolayer sheets, but remain poorly understood. Here we show that higher-order carbon species in the gas-phase play a major role in multilayer nucleation, through the use of in-situ ultraviolet (UV) absorption spectroscopy. These species are the volatilized products of reactions between hydrogen and carbon contaminants that have backstreamed into the reaction chamber from downstream system components. Consequently, we observe a dramatic suppression of multilayer nucleation when backstreaming is suppressed. These results point to an important and previously undescribed mechanism for multilayer nucleation, wherein higher-order gas-phase carbon species play an integral role. Our work highlights the importance of gas-phase dynamics in understanding the overall mechanism of graphene growth.
format	article
author	Abhay Shivayogimath David Mackenzie Birong Luo Ole Hansen Peter Bøggild Timothy J. Booth
author_facet	Abhay Shivayogimath David Mackenzie Birong Luo Ole Hansen Peter Bøggild Timothy J. Booth
author_sort	Abhay Shivayogimath
title	Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy
title_short	Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy
title_full	Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy
title_fullStr	Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy
title_full_unstemmed	Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy
title_sort	probing the gas-phase dynamics of graphene chemical vapour deposition using in-situ uv absorption spectroscopy
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b8d80fb70b0b4c47873c3e87a694f275
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Probing the Gas-Phase Dynamics of Graphene Chemical Vapour Deposition using in-situ UV Absorption Spectroscopy

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