Hydrothermal Synthesis of W and Mo co-doped VO2 (R) Microrods at Low Temperature

Abstract

We report the hydrothermal synthesis of W and Mo co-doped VO2 (R) microrods at temperature of 200 o C. The phase structure of the VO2 changes from VO2 (B) to VO2 (B) + VO2 (M) phase mixture and finally to VO2 (R) with in- creasing hydrothermal time, and the corresponding morphology changes from nanoplate to microrod. The co-doping of W and Mo can substantially reduce the formation temperature and time of the VO2 (R) phase. There is a doping competitive between W and Mo ions, depending on the hydrothermal conditions and vanadium ion concentration, and the doping of W has preference over Mo. The co-doping of W and Mo is more favorable in obtaining more stable VO2 (R) structure because of its lowest formation energy.