Raman mapping of a single-layer to double-layer graphene transition

Graf, D.; Molitor, F.; Ensslin, K.; Stampfer, C.; Jungen, A.; Hierold, C.; Wirtz, Ludger

doi:10.1140/epjst/e2007-00237-1

Reference : Raman mapping of a single-layer to double-layer graphene transition


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/17583

Title :	Raman mapping of a single-layer to double-layer graphene transition
Language :	English
Author, co-author :	Graf, D. [ETH Zurich > Solid State Physics Laboratory]
	Molitor, F. [ETH Zurich > Solid State Physics Laboratory]
	Ensslin, K. [ETH Zurich > Solid State Physics Laboratory]
	Stampfer, C. [ETH Zurich > Micro and Nanosystems]
	Jungen, A. [ETH Zurich > Micro and Nanosystems]
	Hierold, C. [ETH Zurich > Micro and Nanosystems]
	Wirtz, Ludger [Institut d'électronique de microélectronique et de nanotechnologie = Institute for Electronics, Microelectronics, and Nanotechnology - IEMN]
Publication date :	2007
Journal title :	European Physical Journal. Special Topics
Publisher :	EDP Sciences
Volume :	148
Pages :	171-176
Peer reviewed :	Yes (verified by ORBi^lu)
Audience :	International
ISSN :	1951-6355
e-ISSN :	1951-6401
City :	Les Ulis
Country :	France
Abstract :	[en] We report on confocal Raman spectroscopy on a few-layer graphene flake. Adjacent single- and double-layer graphene sections allow mapping the transition in vibrational and electronic properties to a second stacked graphene sheet and with it a weak interlayer coupling. Most prominently the width of the D' peak doubles upon going from a single to a double layer, which can be explained within the double-resonant Raman model. The intensities of the G and G' lines decrease at the crossover to a single layer. Contrary to the G' line the G peak position shifts to higher wave numbers, however, not uniformly over the entire section: its frequency fluctuates spatially. The Raman map of the D line intensity shows a non-zero contribution at the boundaries of the flake and the individual sections, which can be attributed either to defects and disorder or to the breakdown of translational symmetry, whereas within the flake no D line signal is detected.
Permalink :	http://hdl.handle.net/10993/17583
DOI :	10.1140/epjst/e2007-00237-1
Commentary :	2006 Graphene Week 2006 International Conference Dresden GERMANY Phys Complex Syst

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