A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film
An oxygen gas microsensor based on nanostructured sol-gel TiO2 thin films with a buried Pd layer was developed on a silicon substrate. The nanostructured titania thin films for O2 sensors were prepared by the sol-gel process and became anatase after heat treatment. A sandwich TiO2 square board with...
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| Format: | Article |
| Language: | English |
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MDPI AG
2014-09-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/14/9/16423 |
| _version_ | 1811186280961146880 |
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| author | Hairong Wang Lei Chen Jiaxin Wang Quantao Sun Yulong Zhao |
| author_facet | Hairong Wang Lei Chen Jiaxin Wang Quantao Sun Yulong Zhao |
| author_sort | Hairong Wang |
| collection | DOAJ |
| description | An oxygen gas microsensor based on nanostructured sol-gel TiO2 thin films with a buried Pd layer was developed on a silicon substrate. The nanostructured titania thin films for O2 sensors were prepared by the sol-gel process and became anatase after heat treatment. A sandwich TiO2 square board with an area of 350 μm × 350 μm was defined by both wet etching and dry etching processes and the wet one was applied in the final process due to its advantages of easy control for the final structure. A pair of 150 nm Pt micro interdigitated electrodes with 50 nm Ti buffer layer was fabricated on the board by a lift-off process. The sensor chip was tested in a furnace with changing the O2 concentration from 1.0% to 20% by monitoring its electrical resistance. Results showed that after several testing cycles the sensor’s output becomes stable, and its sensitivity is 0.054 with deviation 2.65 × 10−4 and hysteresis is 8.5%. Due to its simple fabrication process, the sensor has potential for application in environmental monitoring, where lower power consumption and small size are required. |
| first_indexed | 2024-04-11T13:42:49Z |
| format | Article |
| id | doaj.art-528c833bfc2e46a7a3ef2f290bd04a98 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:42:49Z |
| publishDate | 2014-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-528c833bfc2e46a7a3ef2f290bd04a982022-12-22T04:21:10ZengMDPI AGSensors1424-82202014-09-01149164231643310.3390/s140916423s140916423A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin FilmHairong Wang0Lei Chen1Jiaxin Wang2Quantao Sun3Yulong Zhao4State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University , Xi'an 710049, Shaanxi, ChinaState Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University , Xi'an 710049, Shaanxi, ChinaState Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University , Xi'an 710049, Shaanxi, ChinaState Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University , Xi'an 710049, Shaanxi, ChinaState Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University , Xi'an 710049, Shaanxi, ChinaAn oxygen gas microsensor based on nanostructured sol-gel TiO2 thin films with a buried Pd layer was developed on a silicon substrate. The nanostructured titania thin films for O2 sensors were prepared by the sol-gel process and became anatase after heat treatment. A sandwich TiO2 square board with an area of 350 μm × 350 μm was defined by both wet etching and dry etching processes and the wet one was applied in the final process due to its advantages of easy control for the final structure. A pair of 150 nm Pt micro interdigitated electrodes with 50 nm Ti buffer layer was fabricated on the board by a lift-off process. The sensor chip was tested in a furnace with changing the O2 concentration from 1.0% to 20% by monitoring its electrical resistance. Results showed that after several testing cycles the sensor’s output becomes stable, and its sensitivity is 0.054 with deviation 2.65 × 10−4 and hysteresis is 8.5%. Due to its simple fabrication process, the sensor has potential for application in environmental monitoring, where lower power consumption and small size are required.http://www.mdpi.com/1424-8220/14/9/16423O2 sensorssol-gelnanostructuredMEMS (Micro-Electro-Mechanical System)thin filmsTiO2 |
| spellingShingle | Hairong Wang Lei Chen Jiaxin Wang Quantao Sun Yulong Zhao A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film Sensors O2 sensors sol-gel nanostructured MEMS (Micro-Electro-Mechanical System) thin films TiO2 |
| title | A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film |
| title_full | A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film |
| title_fullStr | A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film |
| title_full_unstemmed | A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film |
| title_short | A Micro Oxygen Sensor Based on a Nano Sol-Gel TiO2 Thin Film |
| title_sort | micro oxygen sensor based on a nano sol gel tio2 thin film |
| topic | O2 sensors sol-gel nanostructured MEMS (Micro-Electro-Mechanical System) thin films TiO2 |
| url | http://www.mdpi.com/1424-8220/14/9/16423 |
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