Departmental Papers (MSE)

Out-of-plane Preferred Orientation of Single Wall Carbon Nanotube Films

Wei Zhou, University of Pennsylvania
Karen I. Winey, University of Pennsylvania
John E. Fischer, University of Pennsylvania
T. V. Sreekumar, Georgia Institute of Technology
S. Kumar, Georgia Institute of Technology
H. Kataura, Tokyo Metropolitan University

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

Abstract

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.