Abstract
Growth of multi-level carbon nanotube networks is demonstrated using nanoscale catalyst patterning and chemical vapor deposition. An iron-based liquid catalyst was patterned into hexagonal close-packed rings with a colloidal mask and used to produce nanotubes from methane gas feedstock at 900 °C. The resulting structures consisted of different levels of multi-walled and single-walled nanotubes arranged in regular arrays. A cooperative growth model is proposed to account for these self-assembled nanoscale networks and indicates the possibility of using a two-dimensional pattern to direct the three-dimensional assembly of carbon nanotubes.
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