Room temperature NO2-sensing properties of hexagonal tungsten oxide nanorods
Wu Yaqiao1, 2, Hu Ming1, †, Tian Yuming2
       

(color online) XRD patterns of (a) freshly-obtained WO3 nanorods, (b) 300-°C-, (c) 400-°C-, and (d) 500-°C-annealing WO3 nanorods.