Abstract

Molybdenum trioxide nanostructures were grown by direct evaporation of MoO 3 from a tungsten boat resistively heated in the presence of hydrogen or helium as carrier gas at pressures from 100 to 600 Pa. Crystalline structures such as, nanoribbons, nanofibers, nanoneedles and nanoparticles were obtained at source temperatures below 900°C. On the other hand, at source temperatures above 1000°C, nanoporous structures were obtained. The latter were found more often when hydrogen was used as carrier gas. Copyright © 2008 American Scientific Publishers. All rights reserved.