Morphology-controlled preparation of tungsten oxide nanostructures for gas-sensing application*
Qin Yu-Xiang†, Liu Chang-Yu, Liu Yang
       
FESEM images of the as-synthesized tungsten oxides after hydrothermal reaction of 9 h, showing (a) the 1D nanowire carpet on the induction layer resulting from WCl6, ((b) and (c)) the 3D hierarchical structure on the induction layer resulting from Na2WO4·2H2O. The insets in panels (a) and (b) respectively show the morphologies of the used induction layers.