Two-dimensional self-assembled network structure of Co3O4 quantum-dot-decorated ZnO nanobeads for ppb-level acetone sensors
- Authors
- Cho, Chang Hee; Oh, Jin Young; Lee, Tae Il
- Issue Date
- 1-May-2022
- Publisher
- Elsevier
- Keywords
- Acetone sensor; Co3O4; Metal oxide; Self-assembly; ZnO
- Citation
- Materials Letters, v.314
- Journal Title
- Materials Letters
- Volume
- 314
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83832
- DOI
- 10.1016/j.matlet.2022.131826
- ISSN
- 0167-577X
- Abstract
- A two-dimensional self-assembled network structure of ZnO nanobeads (NBs) decorated with Co3O4 quantum dots (QDs) was fabricated by an alcohol-assisted Langmuir–Blodgett method for a highly sensitive acetone sensor. Owing to the formation of a p–n junction between the Co3O4 QDs and ZnO NBs and the catalytic activity of Co3O4 QDs for acetone oxidation, the operating temperature of the sensor decreased from 350 to 250 °C, and the response to 1 ppm acetone increased from 5.3 to 7.2. The response was 1.5 even to 40 ppb acetone. Furthermore, the sensor was applied to a commercial breath analyzer, and ppb-levels of acetone were successfully detected in the exhalation of an adult. © 2022 Elsevier B.V.
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