Abstract
Gallia–ZnO nanohybrid sensors are fabricated and their response to ethanol, CO, methane, acetone and toluene are investigated. Gallia–ZnO samples containing 0–50wt% Ga2O3 were prepared via a facile co-precipitation method using zinc chloride and gallium nitrate aqueous solutions without any template and calcined at 500°C. The samples were characterized by XRD, EDX, SEM, PL and BET surface area measurement techniques. The samples with up to 5wt% gallia show hexagonal; wurtzite structure of ZnO, while those containing 10wt% gallia present additional weak ZnGa2O4 reflexes amplified for the samples with higher gallia contents. The highest responses of 177.3 and 44.3–300ppm ethanol and CO are observed for the sensors containing 1 and 0wt% Ga2O3, respectively. The sensor containing 3wt% Ga2O3–ZnO with a response of 120 is selective to ethanol in presence of CO, acetone, toluene and methane at 300°C. Also, the sensor containing 50wt% Ga2O3 is selective to ethanol and show negligible responses to 300ppm of CO, acetone, toluene and 1% methane at the same temperature.
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