Enhancement of hydrothermally Co3O4 thin films as H2S gas sensor by loading yttrium element

الملخص EN

The gas sensing properties of Co3O4 and Co3O4:Y nano structures were investigated.

The films were synthesized using the hydrothermal method on a seeded layer.

The XRD, SEM analysis and gas sensing properties were investigated for Co3O4 and Co3O4:Y thin films.

XRD analysis shows that all films are polycrystalline in nature, having a cubic structure, and the crystallite size is (11.7)nm for cobalt oxide and (9.3)nm for the Co3O4:10%Y.

The SEM analysis of thin films obviously indicates that Co3O4 possesses a nanosphere-like structure and a flower-like structure for Co3O4:Y.

The sensitivity, response time and recovery time to a H2S reducing gas were tested at different operating temperatures.

The resistance changes with exposure to the test gas.

The results reveal that the Co3O4:10%Y possesses the highest sensitivity around 80% at a 100oC operating temperature when exposed to the reducing gas H2S with 0.8sec for both recovery and response times.