Out-of-plane Preferred Orientation of Single Wall Carbon Nanotube Films
Document Type Journal Article
Postprint version. Published in Applied Physics Letters, Volume 82, Issue 12, 22 March 2004, pages 2172-2174.
Publisher URL: http://scitation.aip.org/journals/doc/APPLAB-ft/vol_84/iss_12/2172_1.html
Nanotube films deposited from suspension onto filter membranes, or by drop casting or spin coating onto flat substrates, exhibit preferred orientation normal to the film. Using x-ray scattering and a 2-D detector, we show for single wall carbon nanotube (SWNT) films that this can be easily and accurately determined. The out-of-plane mosaic varies significantly with deposition conditions. The aligning effects of deposition and external force in the film plane (e.g. magnetic field) are additive, the out-of-plane mosaic being narrower than the in-plane one. Films from well-dispersed tubes show better alignment than from poor dispersions. The finite out-of-plane mosaic in C60@SWNT films enables quantitative separation of 1-D diffraction (chains of C60 peas) from the 2-D lattice diffraction (triangular rope lattice).
Date Posted: 19 January 2005
This document has been peer reviewed.