Conductometric ppb-level acetone gas sensor based on one-pot synthesized Au @Co3O4 core-shell nanoparticles
- Title
- Conductometric ppb-level acetone gas sensor based on one-pot synthesized Au @Co3O4 core-shell nanoparticles
- Author
- 김현우
- Keywords
- Acetone; Au@Co3O4; Core-shell nanoparticles; Gas sensor; Sensing mechanism
- Issue Date
- 2022-05
- Publisher
- Elsevier B.V.
- Citation
- Sensors and Actuators B: Chemical, v. 359, article no. 131550, Page. 1-12
- Abstract
- Detection of acetone is of paramount significance in many fields including self-medical diagnosis, indoor air quality monitoring and other industries. In this study, we assess the acetone sensing capability of novel Au@Co3O4 core-shell nanoparticles (NPs) fabricated using a simple, low temperature (70 °C), in-situ, self-assembly process. The fabricated core-shell nanostructure was sized 70–180 nm, with pomegranate-type morphology and consisted of multi-core Au NPs (5–10 nm in size) inside the Au@Co3O4 core-shell system. P-type Au@Co3O4 core-shell NPs sensor indicated a high response of 27.05–10 ppm acetone at 250 °C. The Au@Co3O4 core-shell NPs sensor also possessed excellent selectivity towards acetone among other interfering gases. The influence of varying levels of relative humidity (RH) on the Au@Co3O4 core-shell NPs were examined, rendering a 60% of response to 2 ppm acetone at 80% RH, and no significant reduction in response at 10–40% RH. The sensor also displayed a low limit of detection (20 ppb), the concentration which is much below the detectable range (1.8 ppm) for a type-I diabetic patient. The Au@Co3O4 core-shell NP sensor developed in this study is considered to open the doors for preparation of other varieties of metal-oxide core-shell systems sensors in a facile approach.
- URI
- https://www.sciencedirect.com/science/article/pii/S0925400522001927?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/178169
- ISSN
- 0925-4005;0925-4005
- DOI
- 10.1016/j.snb.2022.131550
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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