講演・口頭発表等

国際会議
2021年7月22日

VOC-sensing properties of semiconductor type gas sensors: effects of CuO loading onto porous SnO2

Materials Challenges in Alternative & Renewable Energy 2021 (MCARE 2021)
  • Soichiro Torai
  • ,
  • Taro Ueda
  • ,
  • Kai Kamada
  • ,
  • Takeo Hyodo
  • ,
  • Yasuhiro Shimizu

開催年月日
2021年7月19日 - 2021年8月22日
記述言語
英語
会議種別
口頭発表(一般)
主催者
The American Ceramic Society
開催地
Virtual Event
国・地域
アメリカ合衆国

Exhaled breath of the patients contains a higher concentration of specific volatile organic compounds (VOCs) than those of healthy people. Especially, the patients suffering from lung cancer and diabetes release a high concentration of acetone and toluene, respectively. Therefore, the highly sensitive and selective detection of these gases enables diagnoses of these diseases non invasively.
In this study, spherical porous (pr-)SnO2 based particles were prepared by ultrasonic spray pyrolysis employing home-made PMMA microspheres (typical particle size: 70 nm in diameter), and their VOC-sensing properties were examined. Thick film sensors were fabricated by screen printing employing spherical SnO2-based particles obtained (dense SnO2, pr SnO2, and x wt% CuO-loaded pr SnO2 ((pr xCuO/SnO2), x: 0.5, 1.0 and 2.0), and their sensing properties to 20–100 ppm acetone and toluene were measured at 300–500°C in air. The introduction of well-developed porous structures into the spherical SnO2 particles was quite effective in enhancing the VOC-sensing properties. In addition, the loading of CuO onto the spherical pr SnO2 particles improved their VOC responses in the temperature range of 300‒450°C. Among all the sensors tested in this study, the pr 2.0CuO/SnO2 sensor showed the largest responses to acetone and toluene at 350°C and 300°C, respectively.