Abstract
Studies demonstrate the selective gas sensing characteristics of Co-Ni-Zn ferrite thick film towards oxidizing gases over reducing gases. The Co0.3Ni0.3Zn0.4Fe2O4 ferrite was prepared by combustion method and characterized for its phase purity, nanodimension and valence state by analytical techniques, includes X-ray diffraction, Raman spectroscopy, Transmission Electron Microscopy and X-ray photoelectron spectroscopy, respectively. The Co0.3Ni0.3Zn0.4Fe2O4 gas sensor was fabricated in the form of thick film by screen printing method, and the response of film towards selected oxidizing gases and the reducing gases were investigated. It was found that Co0.3Ni0.3Zn0.4Fe2O4 thick film is highly active towards oxidizing gases at 200 °C, whereas almost negligible response was observed for reducing gases at all temperatures ranging from RT to 300 °C. The Oxygen adsorption - desorption mechanism is proposed for sensing of NO2 and Cl2 gases, and stated to be favored by n to p type conductivity transition on the surface of sensor film at 200 °C.
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