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...
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MDPI AG
2022-08-01
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Online Access: | https://www.mdpi.com/1424-8220/22/16/6277 |
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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. |
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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 |
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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 |
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