Epitaxial growth of WO_x nanorods on single‐crystal tungsten substrate

Abstract

SUMMARYNanorods of substoichiometric tungsten oxide (WO x ) were grown on single-crystal tungsten substrate. The grown nanorods were investigated with scanning electron microscopy and atomic force microscopy. WO x nanorods were grown on W(001) in accordance with epitaxial relationship between WO 3 crystals and W(001) surface. The results indicate that the WO 3 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.