Abstract
Abstract A liquid-petroleum gas sensor has been developed with high selectivity and sensitivity based on an oxygen deficient spinel semiconductor, ZnGa2O4. The operating temperature of the sensor element has been optimised under different operating conditions. Palladium doped zinc gallate sensor, on exposure to LPG at about 320°C showed a change of 4–5 orders in the resistance. The response time also decreases from about 20 min in virgin ZnGa2O4 to less than 1 min in the palladium doped element. The electronic interaction between additive and semiconductor is proposed to account for the sensitisation effects in the sensor element.
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