Highly Selective and Sensitive Detection of Acetone by ZnWO4-WO3 Hetero-composite Spheres
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ZnWO4-WO3 hetero-composite microspheres were prepared by ultrasonic spray pyrolysis of a solution containing Zn and W cations,followed by heat treatment at 600oC. The gas-sensing characteristics of 5 at% of Zn-added WO3 (5Zn-WO3; ZnWO4-WO3 hetero-composite) microspheres to 1 ppm acetone, ethanol, 20 ppm hydrogen (H2), 5 ppm carbon monoxide (CO), 25 ppb toluene, and 5 ppm ammonia (NH3) were measured at 325–400oC under 80% relative humidity (RH). The sensor using 5Zn-WO3 microspheres exhibited highlyselective and sensitive gas-sensing properties to acetone at 375oC even under high humidity conditions. These superior gas-sensing properties were attributed to the increased resistance (electronic sensitization) through n-n heterojunction formation between WO3 and ZnWO4phases and the acidic property of WO3, which exhibited a low gas response to interfering ethanol gas. The superior acetone gas-sensingcharacteristics of the 5Zn-WO3 sensor can be utilized in breath acetone analyzers for rapid, real-time ketogenic diet monitoring.
Abstract
ZnWO4-WO3 hetero-composite microspheres were prepared by ultrasonic spray pyrolysis of a solution containing Zn and W cations,followed by heat treatment at 600oC. The gas-sensing characteristics of 5 at% of Zn-added WO3 (5Zn-WO3; ZnWO4-WO3 hetero-composite) microspheres to 1 ppm acetone, ethanol, 20 ppm hydrogen (H2), 5 ppm carbon monoxide (CO), 25 ppb toluene, and 5 ppm ammonia (NH3) were measured at 325–400oC under 80% relative humidity (RH). The sensor using 5Zn-WO3 microspheres exhibited highlyselective and sensitive gas-sensing properties to acetone at 375oC even under high humidity conditions. These superior gas-sensing properties were attributed to the increased resistance (electronic sensitization) through n-n heterojunction formation between WO3 and ZnWO4phases and the acidic property of WO3, which exhibited a low gas response to interfering ethanol gas. The superior acetone gas-sensingcharacteristics of the 5Zn-WO3 sensor can be utilized in breath acetone analyzers for rapid, real-time ketogenic diet monitoring.
참고문헌 (19)
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