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On the structure and topography of free-standing chemically modified graphene
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Wilson, Neil R., Pandey, Priyanka A., Beanland, R., Rourke, Jonathan, Lupo, U., Rowlands, G. (George) and Römer, Rudolf A. (2010) On the structure and topography of free-standing chemically modified graphene. New Journal of Physics, Vol.12 . Article no. 125010 . doi:10.1088/1367-2630/12/12/125010 ISSN 1367-2630.
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Official URL: http://dx.doi.org/10.1088/1367-2630/12/12/125010
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, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Science > Centre for Scientific Computing |
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| 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 | ||||
| Official Date: | 13 December 2010 | ||||
| Dates: |
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| Volume: | Vol.12 | ||||
| Number of Pages: | 21 | ||||
| Page Range: | Article no. 125010 | ||||
| DOI: | 10.1088/1367-2630/12/12/125010 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Funder: | University of Warwick. Warwick Centre for Analytical Science | ||||
| Grant number: | EP/F034210/1 (UoW) |
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