Papers by Keyword: Doping Method

Abstract: Nano crystalline SnO₂ was prepared by sol-gel with PEG surfactant. CuO was doped in the SnO₂ by mechanical mixture and reaction congelation from CuCl. The samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption isotherms (BET). The results indicated that the average crystal size of SnO2 at sintering temperature of 550 °C was 10 nm, the conglomeration size of SnO₂ was about 100 nm. The specific surface area of pure SnO₂, mechanical doping SnO₂ and reaction doping SnO₂ were 110, 84, 72 m²/g, respectively. The thick film gas sensors made from these samples were examined. SnO₂ doped by different methods had different electrical and gas-sensing properties. The sensors based on CuO doped SnO₂ films exhibited less sensitive to ethanol gas but extremely higher sensitivity to H₂S gas than that of pure SnO₂.