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The Role and Control of Residual Bulk Oxygen in the Catalytic Growth of 2D Materials

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cam.depositDate2022-06-23
cam.issuedOnline2019-06-11
cam.orpheus.success2022-06-23 - Embargo set during processing via Fast-track
dc.contributor.authorBurton, OJ
dc.contributor.authorBabenko, V
dc.contributor.authorVeigang-Radulescu, VP
dc.contributor.authorBrennan, B
dc.contributor.authorPollard, AJ
dc.contributor.authorHofmann, S
dc.contributor.orcidHofmann, S [0000-0001-6375-1459]
dc.date.accessioned2022-06-23T23:30:16Z
dc.date.available2022-06-23T23:30:16Z
dc.date.issued2019
dc.date.updated2022-06-23T10:32:31Z
dc.description.abstractWe systematically study the effects of residual oxygen in the bulk of Cu foil catalysts on the chemical vapor deposition (CVD) of graphene. While oxidation is widely used to remove impurities in metal catalysts and to control the nucleation density of graphene, we show that minute concentrations of residual bulk oxygen can significantly deteriorate the quality of as-grown graphene highlighted by an increased Raman D/G ratio, increased propensity to postgrowth etching, and increased fraction of multilayer graphene nucleation. Starting from commercial Cu foils, we show that a simple hydrogen annealing step after the initial oxidation allows us to lower the residual oxygen level as measured by time-of-flight secondary ion mass spectrometry to produce graphene of significantly higher quality. This can be effectively combined with a short hydrocarbon exposure time of 10 min to achieve near full monolayer graphene coverage, suitable for emerging industrial applications. We show that residual oxygen can have an equally significant impact on Fe-catalyzed h-BN CVD and discuss the underlying mechanisms with parallels to well-known processes in metallurgy, catalysis, and vacuum science.
dc.identifier.doi10.17863/CAM.85743
dc.identifier.eissn1932-7455
dc.identifier.issn1932-7447
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/338333
dc.language.isoeng
dc.publisherAmerican Chemical Society (ACS)
dc.publisher.departmentDepartment of Engineering
dc.publisher.urlhttp://dx.doi.org/10.1021/acs.jpcc.9b03808
dc.rightsPublisher's own licence
dc.subject40 Engineering
dc.subject34 Chemical Sciences
dc.titleThe Role and Control of Residual Bulk Oxygen in the Catalytic Growth of 2D Materials
dc.typeArticle
prism.endingPage16267
prism.issueIdentifier26
prism.publicationDate2019
prism.publicationNameJournal of Physical Chemistry C
prism.startingPage16257
prism.volume123
pubs.funder-project-idEPSRC (1772057)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/M508007/1)
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) Future and Emerging Technologies (FET) (785219)
pubs.licence-display-nameApollo Repository Deposit Licence Agreement
pubs.licence-identifierapollo-deposit-licence-2-1
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1021/acs.jpcc.9b03808

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