Thick film gas sensors made from Mn doped zinc oxide nanorods for H2S gas

Abstract Nanorods of pure and Mn doped ZnO were synthesized by precipitation method. Thick films of synthesized materials were prepared by screen printing method. Structural and morphological characterizations were carried out by XRD, FESEM and EDAX. The gas sensing characteristics of prepared thick films were checked for different gases i.e. Hydrogen Sulfide (H2S), Carbon dioxide (CO2) and Liquefied Petroleum Gas (LPG). XRD analysis showed hexagonal wurtzite structure and high crystallalline nanorod of ZnO and Mn doped ZnO. The FE-SEM showed similar morphology. Mn doped ZnO thick films showed enhanced response to H2S gas than pure ZnO thick film for 600 ppm gas concentration. Among all Mn doped ZnO thick films, 6% Mn doped ZnO film showed good sensitivity and selectivity towards H2S as compared to the other test gases like CO2 and LPG.