Epitaxial Growth of WOx Nanorod on Single Crystal Tungsten Substrate

Abstract

Nanorods of substoichiometric tungsten oxide (WO_x) were grown on single crystal tungsten substrate. The grown nanorods were investigated with scanning electron micrope and atomic force microscope. WO_x nanorods were grown on W(001) in accordance with epitaxial relationship between WO₃ crystals and W(001) surface. The results indicate that the WO₃ crystals formed at the initial stage act as the nuclei of WO_x nanorods. Nanorod growth of certain epitaxial directions can be selectively enhanced by choosing growth methods or choosing suitable crystallographic orientation of substrate surface.