Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals
Understanding the surface chemistry of target gases on sensing materials is essential for designing high-performance gas sensors. Here, we report the effect of Pt-loading on the sensing of volatile organic compounds (VOCs) with ZnO gas sensors, demonstrated by diffuse reflection infrared Fourier tra...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-08-01
|
| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/22/16/6277 |
| _version_ | 1797431689295691776 |
|---|---|
| author | Takeshi Shinkai Keigo Masumoto Masaru Iwai Yusuke Inomata Tetsuya Kida |
| author_facet | Takeshi Shinkai Keigo Masumoto Masaru Iwai Yusuke Inomata Tetsuya Kida |
| author_sort | Takeshi Shinkai |
| collection | DOAJ |
| description | Understanding the surface chemistry of target gases on sensing materials is essential for designing high-performance gas sensors. Here, we report the effect of Pt-loading on the sensing of volatile organic compounds (VOCs) with ZnO gas sensors, demonstrated by diffuse reflection infrared Fourier transform (DRIFT) spectroscopy. Pt-loaded ZnO nanocrystals (NCs) of 13~22 nm are synthesized using the hot soap method. The synthesized powder is deposited on an alumina substrate by screen-printing to form a particulate gas sensing film. The 0.1 wt% Pt-loaded ZnO NC sensor shows the highest sensor response to acetone and ethanol at 350 °C, while the responses to CO and H<sub>2</sub> are small and exhibit good selectivity to VOCs. The gas sensing mechanism of ethanol with Pt-ZnO NCs was studied by in situ DRIFT spectroscopy combined with online FT-IR gas analysis. The results show that ethanol reacts with small Pt-loaded ZnO to produce intermediate species such as acetaldehyde, acetate, and carbonate, which generates a high sensor response to ethanol in air. |
| first_indexed | 2024-03-09T09:49:56Z |
| format | Article |
| id | doaj.art-5e8a1e3e759f4878a66c5cb543b845ed |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T09:49:56Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-5e8a1e3e759f4878a66c5cb543b845ed2023-12-02T00:17:45ZengMDPI AGSensors1424-82202022-08-012216627710.3390/s22166277Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO NanocrystalsTakeshi Shinkai0Keigo Masumoto1Masaru Iwai2Yusuke Inomata3Tetsuya Kida4Department of Material Science and Applied Chemistry, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, JapanDepartment of Material Science and Applied Chemistry, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, JapanDepartment of Material Science and Applied Chemistry, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, JapanDivision of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, JapanDivision of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, JapanUnderstanding the surface chemistry of target gases on sensing materials is essential for designing high-performance gas sensors. Here, we report the effect of Pt-loading on the sensing of volatile organic compounds (VOCs) with ZnO gas sensors, demonstrated by diffuse reflection infrared Fourier transform (DRIFT) spectroscopy. Pt-loaded ZnO nanocrystals (NCs) of 13~22 nm are synthesized using the hot soap method. The synthesized powder is deposited on an alumina substrate by screen-printing to form a particulate gas sensing film. The 0.1 wt% Pt-loaded ZnO NC sensor shows the highest sensor response to acetone and ethanol at 350 °C, while the responses to CO and H<sub>2</sub> are small and exhibit good selectivity to VOCs. The gas sensing mechanism of ethanol with Pt-ZnO NCs was studied by in situ DRIFT spectroscopy combined with online FT-IR gas analysis. The results show that ethanol reacts with small Pt-loaded ZnO to produce intermediate species such as acetaldehyde, acetate, and carbonate, which generates a high sensor response to ethanol in air.https://www.mdpi.com/1424-8220/22/16/6277semiconductor gas sensorPt-loadingZnOethanolDRIFTcatalytic activity |
| spellingShingle | Takeshi Shinkai Keigo Masumoto Masaru Iwai Yusuke Inomata Tetsuya Kida Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals Sensors semiconductor gas sensor Pt-loading ZnO ethanol DRIFT catalytic activity |
| title | Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals |
| title_full | Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals |
| title_fullStr | Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals |
| title_full_unstemmed | Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals |
| title_short | Study on Sensing Mechanism of Volatile Organic Compounds Using Pt-Loaded ZnO Nanocrystals |
| title_sort | study on sensing mechanism of volatile organic compounds using pt loaded zno nanocrystals |
| topic | semiconductor gas sensor Pt-loading ZnO ethanol DRIFT catalytic activity |
| url | https://www.mdpi.com/1424-8220/22/16/6277 |
| work_keys_str_mv | AT takeshishinkai studyonsensingmechanismofvolatileorganiccompoundsusingptloadedznonanocrystals AT keigomasumoto studyonsensingmechanismofvolatileorganiccompoundsusingptloadedznonanocrystals AT masaruiwai studyonsensingmechanismofvolatileorganiccompoundsusingptloadedznonanocrystals AT yusukeinomata studyonsensingmechanismofvolatileorganiccompoundsusingptloadedznonanocrystals AT tetsuyakida studyonsensingmechanismofvolatileorganiccompoundsusingptloadedznonanocrystals |