STUDY OF H_2S GAS SENSING PROPERTIES OF ZINC OXIDE NANORODS

Dr. Mahendra Kumar

Volume : V, Issue : X, October - 2015

STUDY OF H_2S GAS SENSING PROPERTIES OF ZINC OXIDE NANORODS

Dr. Mahendra Kumar

Abstract :

Zinc Oxide nanorods have been synthesized and studied as the sensing element for the detection of H2 S. For gas sensors, nanostructures have advantages of improved gas–sensing characteristics. In this paper, ZnO nanostructures have been prepared by hydrothermal methods. Oxide semiconductors sense gases by their interaction with adsorbed oxygen on the surface. Adsorbed oxygen traps electrons from bulk of semiconductor and interaction with various reducing (H2 S, NH3 , H2 etc.) and oxidizing gases (NO,O3 ) results in change in concentration of trapping centers. The results show that nanorods of pure and anneal ZnO are highly sensitive for Maximum operating temperature (~330 0 ) detection of H2 S. These ZnO nanostrcutres were characterized by SEM and Photoluminescence (PL). ZnO nanostructure synthesized by this method can be used as a promising material for semiconductor gas sensor to detect poisonous gas like H2 S at room temperature with high sensitivity and selectivity