A simple method for the synthesis of highly oriented potassium-doped tungsten oxide nanowires

Very long and highly oriented potassium-doped tungsten oxide nanowires (see Figure) can be synthesized using the simple technique presented here. The mechanism of nanowirc formation is investigated and a vapor-liquid-solid mechanism is proposed. This novel method can be easily scaled up and can also be extended to the preparation of nanowire arrays of other materials.