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Surface-enhanced Raman scattering of graphene caused by self-induced nanogating by GaN nanowire array

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cris.lastimport.scopus2024-02-12T19:29:18Z
dc.abstract.enA constant height of gallium nitride (GaN) nanowires with graphene deposited on them is shown to have a strong enhancement of Raman scattering, whilst variable height nanowires fail to give such an enhancement. Scanning electron microscopy reveals a smooth graphene surface which is present when the GaN nanowires are uniform, whereas graphene on nanowires with substantial height differences is observed to be pierced and stretched by the uppermost nanowires. The energy shifts of the characteristic Raman bands confirms that these differences in the nanowire height has a significant impact on the local graphene strain and the carrier concentration. The images obtained by Kelvin probe force microscopy show clearly that the carrier concentration in graphene is modulated by the nanowire substrate and dependent on the nanowire density. Therefore, the observed surface enhanced Raman scattering for graphene deposited on GaN nanowires of comparable height is triggered by self-induced nano-gating to the graphene. However, no clear correlation of the enhancement with the strain or the carrier concentration of graphene was discovered. (C) 2017 Elsevier Ltd. All rights reserved.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBożek, Rafał
dc.contributor.authorŻytkiewicz, Zbigniew
dc.contributor.authorGRZONKA, JUSTYNA
dc.contributor.authorKierdaszuk, Jakub
dc.contributor.authorSobańska, Marta
dc.contributor.authorDrabińska, Aneta
dc.contributor.authorKazmierczak, P.
dc.contributor.authorKłosek, Kamil
dc.contributor.authorWołoś, Agnieszka
dc.contributor.authorWysmołek, Andrzej
dc.contributor.authorKamińska, Maria
dc.contributor.authorKrajewska, Aleksandra
dc.date.accessioned2024-01-26T09:24:59Z
dc.date.available2024-01-26T09:24:59Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.identifier.doi10.1016/J.CARBON.2017.11.061
dc.identifier.issn0008-6223
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/121170
dc.pbn.affiliationphysical sciences
dc.relation.ispartofCarbon
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleSurface-enhanced Raman scattering of graphene caused by self-induced nanogating by GaN nanowire array
dc.typeJournalArticle
dspace.entity.typePublication