Large-scale hydrothermal synthesis of WO3 nanowires in the presence of K2SO4

Abstract WO 3 nanowires were fabricated by a hydrothermal method in the presence of K 2 SO 4 . The nanowires exhibit a well crystallized one-dimensional structure with 10 nm in diameter and several microns in length. Effects of other alkali salts (KNO 3 , NaNO 3 and Na 2 SO 4 ) on the morphologies of WO 3 nanocrystals were also investigated. The important role of K 2 SO 4 salt in the WO 3 nanowires synthesis has been demonstrated.