Sensing behavior of CdS nanoparticles to SO2, H2S and NH3 at room temperature

Abstract The sensors based on the semiconductor CdS nanoparticles were fabricated in spray technology. The properties of the sensors response to SO 2 , H 2 S, NH 3 , NO 2 , water vapor and some organic solvent vapors were studied systematically. The sensors exhibited a good response to SO 2 , H 2 S and NH 3 at room temperature. The sensor based on CdS prepared with Na 2 S at 353 K displayed a linear response to NH 3 from 0.3 to 6.0% and to SO 2 from 0.5 to 1.7%. The sensor based on CdS prepared with H 2 S at 353 K displayed a linear response to NH 3 from 0.08 to 1.1% and to SO 2 from 0.25 to 1.5%. All the sensor response and recovery times were less than 54 s and 70 s respectively. Temperature and operating voltage significantly affected the response of the sensor.