Microstructure and NO_2 sensing performance of APS ZnO coatings

摘要

This work studied the possibility of using a sensor based on plasma-sprayed zinc oxide (ZnO) sensitive layer for NO_2 detection. The atmospheric plasma spray process was employed to deposit ZnO gas sensing layer and the obtained coating structure was characterized by scanning electron microscopy and X-ray diffraction analysis. The influences of gas concentration, working temperature, water vapor in testing air on NO_2 sensing performance of the ZnO sensors were studied. ZnO sensors showed a good sensitivity and selectivity to NO_2 at an optimal working temperature.