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ZnO-CuO Core-Hollow Cube Nanostructures for Highly Sensitive Acetone Gas Sensors at the ppb Level
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- Authors
- Jae Eun Lee, Chan Kyu Lim, Hyung Ju Park, Hyunjoon Song, Sung-Yool Choi, Dae-Sik Lee
- Issue Date
- 2020-08
- Citation
- ACS Applied Materials & Interfaces, v.12, no.31, pp.35688-35697
- ISSN
- 1944-8244
- Publisher
- American Chemical Society (ACS)
- Language
- English
- Type
- Journal Article
- Project Code
- 20JR1100, Development of a Mobile Diet-monitoring Technology based on Multiple Biomarkers, Dae-Sik Lee
- Abstract
- This paper presents a ZnO-CuO p-n heterojunction chemiresistive sensor that comprises CuO hollow nanocubes attached to ZnO spherical cores as active materials. These ZnO-CuO core-hollow cube nanostructures exhibit a remarkable response of 11.14 at 1 ppm acetone and 200 °C, which is a superior result to those reported by other metal-oxide-based sensors. The response can be measured up to 40 ppb, and the limit of detection is estimated as 9 ppb. ZnO-CuO core-hollow cube nanostructures also present high selectivity toward acetone against other volatile organic compounds and demonstrate excellent stability for up to 40 days. The outstanding gas-sensing performance of the developed nanocubes is attributed to their uniform and unique morphology. Their core-shell-like structures allow the main charge transfer pathways to pass the interparticle p-p junctions, and the p-n junctions in each particle increase the sensitivity of the reactions to gas molecules. The small grain size and high surface area of each domain also enhance the surface gas adsorption.
- KSP Keywords
- Active materials, Charge transfer, Chemiresistive sensor, Gas adsorption, Gas molecules, Highly sensitive, Limit of detection, Metal-oxide(MOX), P-N junction, Petri net(PN), Small grain size