ZnO/ZnS Core-Shell Nanostructures for Low-Concentration NO2 Sensing at Room Temperature

This paper reports the fabrication of a sensor using a ZnO/ZnS core/shell nanostructure for the room-temperature detection of NO
₂
, which is a major constituent of polluted air. A sharp decrease in the conductivity of the sensing material was observed upon exposure to NO
₂
gas. A response of 1800% for 100 ppb and 3000% for 2400 ppb of NO
₂
at room temperature was obtained using the core/shell nanostructure.