Combining nitrogen substitutional defects and oxygen intercalation to control the graphene corrugation and doping level
Entity
UAM. Departamento de Física de la Materia Condensada; UAM. Departamento de Física Teórica de la Materia Condensada; UAM. Centro de Investigación en Fisica de la Materia Condensada (IFIMAC); UAM. Instituto Universitario de Ciencia de Materiales Nicolás Cabrera (INC)Publisher
Elsevier Ltd.Date
2018-01-03Citation
10.1016/j.carbon.2017.12.117
Carbon 130 (2018): 362-368
ISSN
0008-6223DOI
10.1016/j.carbon.2017.12.117Funded by
We thank the financial support from AEI and FEDER under project MAT2016-77852-C2-2-R (AEI/FEDER, UE) and from MINECO under projects CSD2010-00024, MAT2014-54484-P and MDM-2014-0377. CRM is grateful to FPI-UAM graduate scholarship program and Fundación Universia for financial supportProject
Gobierno de España. MAT2016-77852-C2-2-R; Gobierno de España. CSD2010-00024; Gobierno de España. MAT2014-54484-P; Gobierno de España. MDM-2014-0377Editor's Version
https://doi.org/10.1016/j.carbon.2017.12.117Subjects
Density functional theory; Graphene; Nitrogen doping; Scanning tunneling microscopy; FísicaRights
© 2018 Elsevier LtdEsta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
By means of Scanning Tunneling Microscopy (STM) experiments and first-principles calculations, we demonstrate the synergetic effect of the combination of two different strategies to modify the properties of graphene supported on a strongly interacting substrate like Rh. A complete control of the corrugation and doping level is achieved combining the introduction of nitrogen defects and oxygen intercalation. Firstly, we show how to use ion bombardment to obtain purely-substitutional N-doped graphene on Rh(111) with tunable dopant concentration. In a second step, the interaction with the substrate is controlled by the amount of intercalated oxygen atoms. Unlike weakly interacting substrates, the highly corrugated structure of G/Rh(111) leads to remarkable variations of the electronic properties associated with nitrogen defects created in the high and low areas of the moiré. After oxygen intercalation, the N-doped graphene layer decouples from the substrate preserving the incorporated nitrogen atoms, which display a subtle dependence of the STM contrast. First–principles calculations confirm the identification of substitutional N-defects and the recovery of the Dirac cone with a tunable shift governed by the nitrogen concentration. Our results support the combination of different modification techniques to tailor structural and electronic properties of graphene and other 2D materials
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Google Scholar:Martín-Recio, Ana
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Romero-Muñiz, Carlos
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Pou Bell, Pablo
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Pérez Pérez, Rubén
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Gómez Rodríguez, José María
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