a1 Solid State and Structural Chemistry Unit and CSIR Center of Excellence in Chemistry, Indian Institute of Science, Bangalore 560 012, and Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur, Bangalore 560 064, India
Hollow nanotubes of SiO2, Al2O3, V2O5, and MoO3 have been prepared using carbon nanotubes as templates. The procedure involves coating the carbon nanotubes with tetraethylorthosilicate, aluminum isopropoxide, or vanadium pentoxide gel, followed by calcination and heating at higher temperatures in air to oxidize the carbon. SiO2 nanotubes containing transition metal ions have been prepared by this procedure since such materials may be of use in catalysis.
(Received April 23 1996)
(Accepted October 29 1996)
c1 Address all correspondence to this author.