High sensitivity ethanol gas sensors

Highly sensitive thick film ethanol gas sensors based on a nanocrystalline were fabricated by painting method on alumina substrates. The crystal structure of the powder was characterised by XRD analysis. The microstructure of the films were characterised using FE-SEM. The experimental results of the ethanol gas sensing characteristics indicated that the undoped thick film has a high sensitivity. The sensitivity of the film heat treated at for 2 hrs. was as high as 32.73 at an operating temperature of to 1000 ppm ethanol gas in air.