Anodic Aluminum Oxide-Based Chemi-Capacitive Sensor for Ethanol Gasopen access
- Authors
- Lim, Gi-Hwan; Kim, In-Yea; Park, Ji-Young; Choa, Yong-Ho; Lim, Jae-Hong
- Issue Date
- Jan-2024
- Publisher
- MDPI
- Keywords
- sensor; AAO; capacitive sensor; surface modification
- Citation
- NANOMATERIALS, v.14, no.1
- Journal Title
- NANOMATERIALS
- Volume
- 14
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/90381
- DOI
- 10.3390/nano14010070
- ISSN
- 2079-4991
2079-4991
- Abstract
- Alcohol ingested by humans can be analyzed via breath tests; however, approximately 1% can be excreted via the skin. In this paper, we present a capacitive sensor using hydrophobically treated anodic aluminum oxide (AAO) capable of detecting alcohol excreted through the epidermis. The degree of hydrophobicity based on the duration of exposure to 3-aminopropyltriethoxysilane vapor comprising a small number of Si-NH2 functional groups on the AAO surface was confirmed and the optimal exposure time was confirmed to be 60 min. The hydrophobized AAO showed a 4.8% reduction in sensitivity to moisture. Simultaneously, the sensitivity of the sensor to ethanol decreased by only 12%. Lastly, the fabricated sensor was successfully operated by attaching it to an ankle-type breathalyzer.
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