Modification of Electrical Properties of Graphene by Substrate-Induced Nanomodulation

A periodically modulated graphene (PMG) generated by nanopatterned surfaces is reported to profoundly modify the intrinsic electronic properties of graphene. The temperature dependence of the sheet resistivity and gate response measurements clearly show a semiconductor-like behavior. Raman spectrosc...

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Bibliographic Details
Published in:Nano letters 2013-08, Vol.13 (8), p.3494-3500
Main Authors: Lee, Jong-Kwon, Yamazaki, Shiro, Yun, Hoyeol, Park, Jinwoo, Kennedy, Gary P, Kim, Gyu-Tae, Pietzsch, Oswald, Wiesendanger, Roland, Lee, SangWook, Hong, Suklyun, Dettlaff-Weglikowska, Urszula, Roth, Siegmar
Format: Article
Language:English
Subjects:
Banded structure
Bending
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Contact
Cross-disciplinary physics: materials science
rheology
Electrical properties
Electrical resistivity
Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Graphene
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Materials science
Methods of nanofabrication
Nanoscale pattern formation
Nanostructure
Physics
Specific materials
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Temperature dependence
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Description
Summary:A periodically modulated graphene (PMG) generated by nanopatterned surfaces is reported to profoundly modify the intrinsic electronic properties of graphene. The temperature dependence of the sheet resistivity and gate response measurements clearly show a semiconductor-like behavior. Raman spectroscopy reveals significant shifts of the G and the 2D modes induced by the interaction with the underlying grid-like nanostructure. The influence of the periodic, alternating contact with the substrate surface was studied in terms of strain caused by bending of graphene and doping through chemical interactions with underlying substrate atoms. Electronic structure calculations performed on a model of PMG reveals that it is possible to tune a band gap within 0.14–0.19 eV by considering both the periodic mechanical bending and the surface coordination chemistry. Therefore, the PMG can be regarded as a further step toward band gap engineering of graphene devices.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl400827p