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CuO nanocrystalline powder was synthesized by a sol-gel auto combustion route with different amounts of the cetyltrimethylammonium bromide (CTAB) used as cationic surfactant. The samples were characterized by XRD, FESEM, and TEM techniques. The electrical properties of the samples without and with different CTAB concentration and the response to ammonia gas at room temperature have been investigated. The CTAB appears to influence the morphology and the properties of CuO powder. The lattice constant values of the samples indicate monoclinic structure. TEM indicate the crystallite size around 7 nm for the CuO with 0.5M CTAB. The addition of surfactant results in an increase in the response of CuO thick films for ammonia at room temperature.

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The present paper describes the alcohol sensing characteristics of spin coated SnO 2 thin film deposited by using sol-gel process. The sensitivity of the film was measured at different temperatures and different concentrations of alcohol at ppm level. Alcohol detection result shows peak sensitivity at 623 K. The variation of sensitivity and ethanol concentration has shown a linear relationship up to 1150 ppm and after that it saturates. The response time measurement of the sensor was also observed and it was found that the response time is 30 sec. The results obtained favour the sol-gel process as a low cost method for the preparation of thin films with a high sensing characteristic.