Fig. 6: XRD patterns of the WO3 nanoneedle films.
a The WO3 nanoneedle film before annealing at 300 °C for 2 h in air. b The WO3 nanoneedle film after annealing at 300 °C for 2 h in air.
Fig. 6: XRD patterns of the WO3 nanoneedle films. | NPG Asia Materials
