Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde
In the present study, the development of a conductometric gas sensor based on Al,Ca-doped zinc oxide composite which is finalized to the detection of formaldehyde (HCHO) at a low concentration in air is investigated. The electrical and sensing properties of the composite based on ZnO doped with diff...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/19/7465 |
| _version_ | 1797476913913004032 |
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| author | Simona Crispi Giovanni Neri |
| author_facet | Simona Crispi Giovanni Neri |
| author_sort | Simona Crispi |
| collection | DOAJ |
| description | In the present study, the development of a conductometric gas sensor based on Al,Ca-doped zinc oxide composite which is finalized to the detection of formaldehyde (HCHO) at a low concentration in air is investigated. The electrical and sensing properties of the composite based on ZnO doped with different loadings of Al and/or Ca (from 0 up to 5 at%) were evaluated. The gas-sensing mechanism of Al,Ca-doped zinc oxide nanocomposite-based sensors was also discussed. The optimized 3%Al,3%Ca-ZnO sensor displayed a formaldehyde response of 3.5 (@ 4 ppm HCHO/air) and an experimental low detection limit of 125 ppb HCHO/air, at the operating temperature of 400 °C. The sensor was also shown to be selective to HCHO with respect to many interferent indoor gases, but NO<sub>2</sub> changed the baseline resistance in an opposite way compared to the target gas. The developed device for monitoring HCHO in indoor and workplace environments has the advantage of a simple planar structure and can be easily fabricated for mass production by using low-cost materials and easy fabrication methods. |
| first_indexed | 2024-03-09T21:10:31Z |
| format | Article |
| id | doaj.art-d789af5268314202850027f3a78478fd |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T21:10:31Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-d789af5268314202850027f3a78478fd2023-11-23T21:49:38ZengMDPI AGSensors1424-82202022-10-012219746510.3390/s22197465Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of FormaldehydeSimona Crispi0Giovanni Neri1Department of Engineering, University of Messina, 98122 Messina, ItalyDepartment of Engineering, University of Messina, 98122 Messina, ItalyIn the present study, the development of a conductometric gas sensor based on Al,Ca-doped zinc oxide composite which is finalized to the detection of formaldehyde (HCHO) at a low concentration in air is investigated. The electrical and sensing properties of the composite based on ZnO doped with different loadings of Al and/or Ca (from 0 up to 5 at%) were evaluated. The gas-sensing mechanism of Al,Ca-doped zinc oxide nanocomposite-based sensors was also discussed. The optimized 3%Al,3%Ca-ZnO sensor displayed a formaldehyde response of 3.5 (@ 4 ppm HCHO/air) and an experimental low detection limit of 125 ppb HCHO/air, at the operating temperature of 400 °C. The sensor was also shown to be selective to HCHO with respect to many interferent indoor gases, but NO<sub>2</sub> changed the baseline resistance in an opposite way compared to the target gas. The developed device for monitoring HCHO in indoor and workplace environments has the advantage of a simple planar structure and can be easily fabricated for mass production by using low-cost materials and easy fabrication methods.https://www.mdpi.com/1424-8220/22/19/7465zinc oxideZnO compositeformaldehydeconductometric sensorindoor quality airworkplace pollution |
| spellingShingle | Simona Crispi Giovanni Neri Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde Sensors zinc oxide ZnO composite formaldehyde conductometric sensor indoor quality air workplace pollution |
| title | Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde |
| title_full | Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde |
| title_fullStr | Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde |
| title_full_unstemmed | Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde |
| title_short | Development of a Conductometric Sensor Based on Al,Ca-Doped ZnO for the Detection of Formaldehyde |
| title_sort | development of a conductometric sensor based on al ca doped zno for the detection of formaldehyde |
| topic | zinc oxide ZnO composite formaldehyde conductometric sensor indoor quality air workplace pollution |
| url | https://www.mdpi.com/1424-8220/22/19/7465 |
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