The n-ZnO/n-In2O3 heterojunction formed by a surface-modification and their potential barrier-control in methanal gas sensing

The gas response of ZnO-modified In2O3 heterojunction was higher and the detection limit was lower than those of intrinsic In2O3 nanostructure, respectively. The energy band structure could be used to explain the enhanced sensitivity of ZnO-modified In2O3 heterojunctions.