Size-controlled synthesis of ZnO nanorods for highly sensitive NO2 gas sensors

In this paper, we reported NO2 sensors based on the ZnO nanorods with different sizes fabricated using a simple hydrothermal method without surfactants. The sensors offered the excellent response and sensitivity to NO2 at very low concentrations as low as 100 ppb. The influence of the size of the ZnO nanorods on the NO2 sensing response was focused.