High Sensitivity Of Tin Oxide Sensor by Sol-Gel Method

Safety as a main parameter on the industry activates leads to work on the smoke detection sensors. In this paper, fabrication steps of a gas sensor based on the Sol-Gel method and also the industrial application of the fabricated sensor for smoke detection is investigated. A system called\\\" Spinner\\\" at temperature 4000C-- is employed to fabricate a thinner sensitive sensor. To produce a thin layer of \\\"Tin Oxide\\\", lean Decoloured (sncl2) is deposited, and glass is used as the base substrate. A process called \\\" spin Coating \\\" several times are tried on the \\\" Spinner \\\" to find an optimal speed of fabrication. The thickness of layers depends on the speed of spinner thus different thicknesses of layers according to different types of the spinner speed can be fabricated. In this research the electrical resistance and sensitivity graphs according to the spinner speed is presented in the response of different temperatures for CO2 gas. Our research after analyzing the obtained data and comparing them together indicate that, the suitable sensitivity of the samples can be achieved by the Sol-Gel technique. Also EDX graph (chart), indicates that this method compared to the other methods such as the electrochemical method, performs higher level of purity. In addition based on the fabrication analyze an optimal speed- of the spinner around (1500 rpm) is reported.-----