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Patterned growth of tungsten oxide and tungsten oxynitride nanorods from Au-coated W foil

This research represents the first reverse-patterned growth technique for the generation of aligned nanorods of different compositions, tungsten oxide and nitride. For most nanowire/nanorod/nanotube growth, a metal (Au or others) catalyst is well-known and commonly used; however we demonstrated the use of a patterned Au coating as a stopper to prohibit their growth, nanomaterials only allowed to grow on the Au-free areas. This result opens up many technical possibilities for direct design and growth of functional nanorods into specific nanodevice components, by using existing chemical or physical patterning techniques,such as lithographic printing, on a working substrate.