Design of nanoneedles-studded nanosheets on cactus-like Mo-WO3 nanoarchitecture for boosted NO2 sensing performance

We reported the design of cactus-like Mo-WO3 nanoarchitecture assembled of 1D nanoneedles and 2D nanosheets for achieving a highly improved NO2 sensing performance. The nanoneedles were vertically studding between the nanosheets forming a cactus-like WO3 nanoarchitecture, leading to highly exposed absorption sites. Mo was introduced in the WO3 & nbsp;nanoarchitecture to introduce oxygen vacancy, resulting in highly activated sites. The resultant 2%Mo-WO3 delivered the sensitivity (Rg/Ra) of 285 to 10 ppm NO2, which was nearly three-times higher than that of pristine WO3. The recovery time was only 24 s, which was greatly decreased, compared with 172 s of pristine WO3.