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

The gas sensing properties of heterojunctions based on binary and ternary metal oxides (CuAl
2
O
4
/Al
2
O
3
/CuO/Cu
2
O, ZnAl
2
O
4
/ZnO and Zn
2
SnO
4
) were investigated in detail and demonstrated excellent sensitivity and selectivity to a series of gases and volatile organic compounds (VOCs), such as H
2
, 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.