MoO3 and WO3 are n-type semiconductor oxide materials which are widely studied for their vast potential application in the various fields of science and technology. These oxides have drawn a great deal of attention of researchers due to its excellent electrochromic behaviour [1, 2], photochromic behaviour [3, 4], gasochromic behaviour[5, 6] and stability towards UV and visible region which could found wide range of applications in the field of electrochromic devices (ECD) [7, 8], memory devices [9,10], smart windows [11] catalytic material [12] and display applications [13]. They are also good gas sensors, in particular, WO3 demonstrated to have good NO2 sensing capability [14] and MoO3 good sensitivity to CO and NO2 [15].