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Title: Tuning electronic properties by oxidation-reduction reactions at graphene-ruthenium interface

Mass production of graphene is associated with the growth on catalysts used also in other chemical reactions. In this study, we exploit the oxidation-reduction to tailor the properties of single layer graphene domains with incorporated bi-layer patches on ruthenium. Using photoelectron spectromicroscopy techniques, we find that oxygen, intercalating under single layer and making it p-doped by the formation of Ru-O x, does not intercalate under the bilayer patches with n-doped upper layer, but decorates them under single layer surrounding creating lateral p-n junctions with chemical potential difference of 1.2 eV. O-reduction by thermal treatment in vacuum results in C-vacancy defects enhancing electronic coupling of remained graphene to Ru, whereas in H 2, vacancy formation is suppressed. Also, for the domains below 15–25 μm size, after O-reduction in H 2, graphene/Ru coupling is restored, while wrinkle pattern produced by O-intercalation is irreversible and can trap reaction products between the wrinkles and Ru surface step edges. In fact, in certain regions of bigger domains, the products, containing H 2O and/or its fragments, remain at the interface, making graphene decoupled and undoped.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Elettra- Sincrotrone Trieste (Italy)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Publication Date:
Report Number(s):
BNL-205785-2018-JAAM
Journal ID: ISSN 0008-6223
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Carbon
Additional Journal Information:
Journal Volume: 138; Journal Issue: C; Journal ID: ISSN 0008-6223
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1456898

Kandyba, Viktor, Al-Mahboob, Abdullah, Giampietri, Alessio, Sadowski, Jerzy T., and Barinov, Alexei. Tuning electronic properties by oxidation-reduction reactions at graphene-ruthenium interface. United States: N. p., Web. doi:10.1016/j.carbon.2018.06.014.
Kandyba, Viktor, Al-Mahboob, Abdullah, Giampietri, Alessio, Sadowski, Jerzy T., & Barinov, Alexei. Tuning electronic properties by oxidation-reduction reactions at graphene-ruthenium interface. United States. doi:10.1016/j.carbon.2018.06.014.
Kandyba, Viktor, Al-Mahboob, Abdullah, Giampietri, Alessio, Sadowski, Jerzy T., and Barinov, Alexei. 2018. "Tuning electronic properties by oxidation-reduction reactions at graphene-ruthenium interface". United States. doi:10.1016/j.carbon.2018.06.014.
@article{osti_1456898,
title = {Tuning electronic properties by oxidation-reduction reactions at graphene-ruthenium interface},
author = {Kandyba, Viktor and Al-Mahboob, Abdullah and Giampietri, Alessio and Sadowski, Jerzy T. and Barinov, Alexei},
abstractNote = {Mass production of graphene is associated with the growth on catalysts used also in other chemical reactions. In this study, we exploit the oxidation-reduction to tailor the properties of single layer graphene domains with incorporated bi-layer patches on ruthenium. Using photoelectron spectromicroscopy techniques, we find that oxygen, intercalating under single layer and making it p-doped by the formation of Ru-Ox, does not intercalate under the bilayer patches with n-doped upper layer, but decorates them under single layer surrounding creating lateral p-n junctions with chemical potential difference of 1.2 eV. O-reduction by thermal treatment in vacuum results in C-vacancy defects enhancing electronic coupling of remained graphene to Ru, whereas in H2, vacancy formation is suppressed. Also, for the domains below 15–25 μm size, after O-reduction in H2, graphene/Ru coupling is restored, while wrinkle pattern produced by O-intercalation is irreversible and can trap reaction products between the wrinkles and Ru surface step edges. In fact, in certain regions of bigger domains, the products, containing H2O and/or its fragments, remain at the interface, making graphene decoupled and undoped.},
doi = {10.1016/j.carbon.2018.06.014},
journal = {Carbon},
number = C,
volume = 138,
place = {United States},
year = {2018},
month = {6}
}