Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al
Humidity sensitivity is evaluated for chemically synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al devices. We succeeded in synthesizing the ZnAl<sub>2</sub>O<sub>4</sub>/Al device by applying chemical techniques only. Hydrothermal treatment for the anodize...
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MDPI AG
2022-08-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/16/6194 |
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| author | Takayuki Nakane Takashi Naka Minako Nakayama Tetsuo Uchikoshi |
| author_facet | Takayuki Nakane Takashi Naka Minako Nakayama Tetsuo Uchikoshi |
| author_sort | Takayuki Nakane |
| collection | DOAJ |
| description | Humidity sensitivity is evaluated for chemically synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al devices. We succeeded in synthesizing the ZnAl<sub>2</sub>O<sub>4</sub>/Al device by applying chemical techniques only. Hydrothermal treatment for the anodized aluminum (AlO<i><sub>x</sub></i>/Al) gives us the device of the ZnAl<sub>2</sub>O<sub>4</sub>/Al structure. All fabrication processes were conducted under 400 °C. The key was focusing on ZnAl<sub>2</sub>O<sub>4</sub> as the sensing material instead of MgAl<sub>2</sub>O<sub>4</sub>, which is generally investigated as the humidity sensor. The evaluation of this ZnAl<sub>2</sub>O<sub>4</sub>/Al device clarified its effectiveness as a sensor. Both electrical capacitance, <i>C</i><sub>p</sub>, and the resistivity, <i>R</i><sub>p</sub>, measured by an LCR meter, obviously responded to the humidity with good sensitivity and appreciable repeatability. Our synthesis technique is possible in principle to improve on the process for the device with a complex structure providing a large surface area. These characteristics are believed to expand the application study of spinel aluminate devices as the sensor. |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-09T12:37:12Z |
| publishDate | 2022-08-01 |
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| series | Sensors |
| spelling | doaj.art-b9c20c080ce04f18834eb7d7bea2e2412023-11-30T22:23:44ZengMDPI AGSensors1424-82202022-08-012216619410.3390/s22166194Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/AlTakayuki Nakane0Takashi Naka1Minako Nakayama2Tetsuo Uchikoshi3Fine Particles Engineering Group, Research Center for Functional Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Ibaraki, JapanFine Particles Engineering Group, Research Center for Functional Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Ibaraki, JapanFine Particles Engineering Group, Research Center for Functional Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Ibaraki, JapanFine Particles Engineering Group, Research Center for Functional Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Ibaraki, JapanHumidity sensitivity is evaluated for chemically synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al devices. We succeeded in synthesizing the ZnAl<sub>2</sub>O<sub>4</sub>/Al device by applying chemical techniques only. Hydrothermal treatment for the anodized aluminum (AlO<i><sub>x</sub></i>/Al) gives us the device of the ZnAl<sub>2</sub>O<sub>4</sub>/Al structure. All fabrication processes were conducted under 400 °C. The key was focusing on ZnAl<sub>2</sub>O<sub>4</sub> as the sensing material instead of MgAl<sub>2</sub>O<sub>4</sub>, which is generally investigated as the humidity sensor. The evaluation of this ZnAl<sub>2</sub>O<sub>4</sub>/Al device clarified its effectiveness as a sensor. Both electrical capacitance, <i>C</i><sub>p</sub>, and the resistivity, <i>R</i><sub>p</sub>, measured by an LCR meter, obviously responded to the humidity with good sensitivity and appreciable repeatability. Our synthesis technique is possible in principle to improve on the process for the device with a complex structure providing a large surface area. These characteristics are believed to expand the application study of spinel aluminate devices as the sensor.https://www.mdpi.com/1424-8220/22/16/6194gas sensorhumidityZnAl<sub>2</sub>O<sub>4</sub>hydrothermal synthesisanodizationoxide |
| spellingShingle | Takayuki Nakane Takashi Naka Minako Nakayama Tetsuo Uchikoshi Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al Sensors gas sensor humidity ZnAl<sub>2</sub>O<sub>4</sub> hydrothermal synthesis anodization oxide |
| title | Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al |
| title_full | Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al |
| title_fullStr | Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al |
| title_full_unstemmed | Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al |
| title_short | Humidity Sensitivity of Chemically Synthesized ZnAl<sub>2</sub>O<sub>4</sub>/Al |
| title_sort | humidity sensitivity of chemically synthesized znal sub 2 sub o sub 4 sub al |
| topic | gas sensor humidity ZnAl<sub>2</sub>O<sub>4</sub> hydrothermal synthesis anodization oxide |
| url | https://www.mdpi.com/1424-8220/22/16/6194 |
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