title: Large-area patterning of carbon nanotube ring arrays.
abstract: Single-walled carbon nanotubes were assembled into large-area arrays of nanoscale rings on silicon via direct patterning with a self-assembled colloidal polystyrene sphere mask. Nanotubes from liquid suspension gathered at the base of each sphere in the mask to form rings, and the resulting arrays consisted of well-ordered nanotube rings with diameters of 203+/-21 nm and 97+/-14 nm for rings formed with 780 and 450 nm colloidal spheres, respectively. Ring heights were found to be 4.7+/-1.8 nm and 5.9+/-1.4 nm for 780 and 450 nm sphere masks, respectively. A first-order geometric model was proposed to account for the observed ring diameters. The approach presented demonstrates an efficient and straightforward path for patterning carbon nanotubes into well-defined surface distributions on various substrates with highly controlled and tunable dimensions.
authors.affiliation: Department of Electrical and Computer Engineering, University of Victoria, P.O. Box 3055, Victoria, British Columbia V8W 3P6, Canada.
authors.forename: Saloome
authors.initials: S
authors.lastname: Motavas
authors.forename: Badr
authors.initials: B
authors.lastname: Omrane
authors.forename: Chris
authors.initials: C
authors.lastname: Papadopoulos