Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors
The sensing properties of adsorption/combustion-type microsensors using 5 wt% Pt-loaded aluminas, which consist of two kinds of alumina (α-Al<sub>2</sub>O<sub>3</sub> and γ-Al<sub>2</sub>O<sub>3</sub>), as sensing (catalytic) materials for ethanol and...
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2025-01-01
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| author | Takeo Hyodo Yuma Matsuura Genki Inao Takahiko Sasahara Yasuhiro Shimizu Taro Ueda |
| author_facet | Takeo Hyodo Yuma Matsuura Genki Inao Takahiko Sasahara Yasuhiro Shimizu Taro Ueda |
| author_sort | Takeo Hyodo |
| collection | DOAJ |
| description | The sensing properties of adsorption/combustion-type microsensors using 5 wt% Pt-loaded aluminas, which consist of two kinds of alumina (α-Al<sub>2</sub>O<sub>3</sub> and γ-Al<sub>2</sub>O<sub>3</sub>), as sensing (catalytic) materials for ethanol and toluene, were investigated in air, and the mixing effects of α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> on the dynamic and static responses of the sensors were discussed in this study. The mixing of 50 wt% α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> was the most effective in enhancing the dynamic responses to ethanol, which originated from the flash combustion behavior of ethanol and/or their partially decomposed products adsorbed on the sensing films from 150 °C to 450 °C, while further mixing of α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> tended to increase the dynamic responses to toluene. On the other hand, the static responses to both ethanol and toluene, which arise from their catalytic combustion at elevated temperatures (450 °C), mainly increased with an increase in the addition of α-Al<sub>2</sub>O<sub>3</sub> in the 5 wt% Pt-loaded aluminas. These results indicate that the synergistic effects of the catalytic activity and the thermal conductivity of the 5 wt% Pt-loaded aluminas are the most important for the sensing properties of these sensors to ethanol and toluene. |
| format | Article |
| id | doaj-art-b5bb0d382247402fb14dceb1d2b0183a |
| institution | Kabale University |
| issn | 2227-9040 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Chemosensors |
| spelling | doaj-art-b5bb0d382247402fb14dceb1d2b0183a2025-01-24T13:26:53ZengMDPI AGChemosensors2227-90402025-01-01131910.3390/chemosensors13010009Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type MicrosensorsTakeo Hyodo0Yuma Matsuura1Genki Inao2Takahiko Sasahara3Yasuhiro Shimizu4Taro Ueda5Graduate School of Integrated Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Nagasaki, JapanGraduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Nagasaki, JapanGraduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Nagasaki, JapanGas Equipment R&D Center, Yazaki Energy System Corporation, 23 Minami Kajama, Futamata-cho, Tenryu-ku, Hamamatsu-shi 431-3393, Shizuoka, JapanGraduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Nagasaki, JapanGraduate School of Integrated Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Nagasaki, JapanThe sensing properties of adsorption/combustion-type microsensors using 5 wt% Pt-loaded aluminas, which consist of two kinds of alumina (α-Al<sub>2</sub>O<sub>3</sub> and γ-Al<sub>2</sub>O<sub>3</sub>), as sensing (catalytic) materials for ethanol and toluene, were investigated in air, and the mixing effects of α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> on the dynamic and static responses of the sensors were discussed in this study. The mixing of 50 wt% α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> was the most effective in enhancing the dynamic responses to ethanol, which originated from the flash combustion behavior of ethanol and/or their partially decomposed products adsorbed on the sensing films from 150 °C to 450 °C, while further mixing of α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> tended to increase the dynamic responses to toluene. On the other hand, the static responses to both ethanol and toluene, which arise from their catalytic combustion at elevated temperatures (450 °C), mainly increased with an increase in the addition of α-Al<sub>2</sub>O<sub>3</sub> in the 5 wt% Pt-loaded aluminas. These results indicate that the synergistic effects of the catalytic activity and the thermal conductivity of the 5 wt% Pt-loaded aluminas are the most important for the sensing properties of these sensors to ethanol and toluene.https://www.mdpi.com/2227-9040/13/1/9adsorption/combustion-type gas sensorMEMSdynamic responsestatic responsethermal conductivitycatalytic activity |
| spellingShingle | Takeo Hyodo Yuma Matsuura Genki Inao Takahiko Sasahara Yasuhiro Shimizu Taro Ueda Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors Chemosensors adsorption/combustion-type gas sensor MEMS dynamic response static response thermal conductivity catalytic activity |
| title | Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors |
| title_full | Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors |
| title_fullStr | Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors |
| title_full_unstemmed | Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors |
| title_short | Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors |
| title_sort | effects of base materials α alumina and or γ alumina on volatile organic compounds vocs sensing properties of adsorption combustion type microsensors |
| topic | adsorption/combustion-type gas sensor MEMS dynamic response static response thermal conductivity catalytic activity |
| url | https://www.mdpi.com/2227-9040/13/1/9 |
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