Skip to Content
Find More Like This
Return to Search

Sacrificial template method of fabricating a nanotube

United States Patent

May 1, 2007
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
Methods of fabricating uniform nanotubes are described in which nanotubes were synthesized as sheaths over nanowire templates, such as using a chemical vapor deposition process. For example, single-crystalline zinc oxide (ZnO) nanowires are utilized as templates over which gallium nitride (GaN) is epitaxially grown. The ZnO templates are then removed, such as by thermal reduction and evaporation. The completed single-crystalline GaN nanotubes preferably have inner diameters ranging from 30 nm to 200 nm, and wall thicknesses between 5 and 50 nm. Transmission electron microscopy studies show that the resultant nanotubes are single-crystalline with a wurtzite structure, and are oriented along the <001> direction. The present invention exemplifies single-crystalline nanotubes of materials with a non-layered crystal structure. Similar "epitaxial-casting" approaches could be used to produce arrays and single-crystalline nanotubes of other solid materials and semiconductors. Furthermore, the fabrication of multi-sheath nanotubes are described as well as nanotubes having multiple longitudinal segments.
Yang; Peidong (Berkeley, CA), He; Rongrui (Berkeley, CA), Goldberger; Joshua (Berkeley, CA), Fan; Rong (El Cerrito, CA), Wu; Yi-Ying (Albany, CA), Li; Deyu (Albany, CA), Majumdar; Arun (Orinda, CA)
The Regents of the University of California (Oakland, CA)
10/ 731,745
December 8, 2003
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Contract No. DE-AC03-76SF00098, awarded by the Department of Energy and Grant No. DMR-0092086, awarded by the National Science Foundation. The Government has certain rights in this invention.