Exposed Mo atoms induced by micropores enhanced H2S sensing of MoO3 nanoflowers

It is well known that the metal atoms of metal oxide semiconductor (MOS) exhibit significant activity in gas sensing. However, limited by the shielding effect of the outer oxygen atom layer, layered MoO 3 is often difficult to show ideal gas adsorption activity. Hence, the MoO 3 microporous nanoflowers (MPNFs) assembled by porous two-dimensional nanosheets were successfully synthesized and exhibited excellent gas sensing performance to H 2 S, and the response was 7.2 times higher than that of simple MoO 3 nanosheets. The abundant pores of MoO 3 MPNFs were due to the influence of the crystal cell shrinkage effect on the atomic arrangement, while the significantly enhanced gas sensing performance was attributed to the positive effect of the microporous structure on gas diffusion and the exposed edge Mo atoms. This was confirmed by DFT calculation results that, compared to the Mo atoms on the surface of MoO 3 nanosheets, the Mo atoms around the pores were exposed because they broke through the shielding effect of the oxygen atom layer and exhibited higher adsorption activity for H 2 S and O 2 molecules. Therefore, this work can shed a light on the design of high-performance gas sensors based on metal oxides .