Wilson, Neil R., Pandey, Priyanka A., Beanland, R., Rourke, Jonathan P., Lupo, U., Rowlands, G. (George) and Roemer, Rudolf A.. (2010) On the structure and topography of free-standing chemically modified graphene. New Journal of Physics, Vol.12 . Article no. 125010 . ISSN 1367-2630

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Abstract

The mechanical, electrical and chemical properties of chemically modified graphene (CMG) are intrinsically linked to its structure. Here, we report on our study of the topographic structure of free-standing CMG using atomic force microscopy (AFM) and electron diffraction. We find that, unlike graphene, suspended sheets of CMG are corrugated and distorted on nanometre length scales. AFM reveals not only long-range (100 nm) distortions induced by the support, as previously observed for graphene, but also short-range corrugations with length scales down to the resolution limit of 10 nm. These corrugations are static not dynamic, and are significantly diminished on CMG supported on atomically smooth substrates. Evidence for even shorter-range distortions, down to a few nanometres or less, is found by electron diffraction of suspended CMG. Comparison of the experimental data with simulations reveals that the mean atomic displacement from the nominal lattice position is of order 10% of the carbon-carbon bond length. Taken together, these results suggest a complex structure for CMG where heterogeneous functionalization creates local strain and distortion.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Chemistry Faculty of Science > Physics Faculty of Science > Centre for Scientific Computing
Library of Congress Subject Headings (LCSH):	Graphene, Atomic force microscopy, Electrons -- Diffraction
Journal or Publication Title:	New Journal of Physics
Publisher:	IOP Publishing
ISSN:	1367-2630
Date:	13 December 2010
Volume:	Vol.12
Number of Pages:	21
Page Range:	Article no. 125010
Identification Number:	10.1088/1367-2630/12/12/125010
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	University of Warwick. Warwick Centre for Analytical Science
Grant number:	EP/F034210/1 (UoW)
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URI:	http://wrap.warwick.ac.uk/id/eprint/4557

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