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이찬우,노용래,정종식,백성기 ( Chanwoo lee,Yongrae Roh,Jongshik Chung,Sunggi Baik ) 한국센서학회 1996 센서학회지 Vol.5 No.3
We developed SAW gas sensor for monitoring SOx gas with high sensitivity. It was fabricated as a microsensor for detecting SOx gas by depositing sensing material on SAW device. As a detecting layer material, CdS was selected. Deposition of CdS in the form of thin films was carried out by the ultrasonic spray pyrolysis method using ultrasonic spray nozzle. Thin films with the uniform and large surface area for sensors were deposited. The stable pyrolysis environment provided by uniform and fine droplets formed by spray nozzle made it possble to obtain thin films with excellent quality. The minimum grain size of the CdS thin films was about 50 nm when deposited at 300℃. SAW gas sensors showed reasonable sensitivity and reproducibility. Further studies are required to investigate the interference of other gases to SOx gas detection.