High-Performance Gas Sensors Using Heterostructures based on Binary and Ternary Metal Oxides

Abstract

The gas sensing properties of heterojunctions based on binary and ternary metal oxides (CuAl2O4/Al2O3/CuO/Cu2O, ZnAl2O4/ZnO and Zn2SnO4) were investigated in detail and demonstrated excellent sensitivity and selectivity to a series of gases and volatile organic compounds (VOCs), such as H2, CO and ethanol. The dynamic measurements showed excellent response stability at low and high relative humidity, which is very important for applications like diseases detection by breath analysis.