Tin Dioxide Thin Films As Carbon Monoxide Sensor

Abstract

Abstract : This research aims to create SnO2 thin films that have the size of micrometers to nanometers for detecting CO gas. The method used in this research is a sol-gel method where all precursors such as tin dichloride, distilled water, ethanol, and ammonium fluoride 5%-10% (w/w) are mixed together to form a colloidal system . The colloidal systems with the addition of palladium are precipitated on a glass substrate. The substrate is heated at the temperature of 70 o C and 100 o C. Then the resistance value is determined using the avometer. The SnO 2 thin films are characterized by SEM and XRD. The result of this research is that SnO 2 thin films show the best sensitivity in colloidal systems with the addition of ammonium fluoride 10% (w/w). The result of the characterization of SEM and XRD concludes that SnO 2 thin films can be obtained by a sol-gel method with a nanometer-scale size and it can respond to the CO gas. Keywords: carbon monoxide, metal oxides, sol-gel method, thin films