Conductometric ppb-level acetone gas sensor based on one-pot synthesized Au @Co3O4 core-shell nanoparticles
- Authors
- Lee, Ha Young; Bang, Jae Hoon; Majhi, Sanjit Manohar; Mirzaei, Ali; Shin, Ka Yoon; Yu, Dong Jae; Oum, Wansik; Kang, Sukwoo; Lee, Min Lyul; Kim, Sang Sub; Kim, Hyoun Woo
- Issue Date
- May-2022
- Publisher
- Elsevier B.V.
- Keywords
- Acetone; Au@Co3O4; Core-shell nanoparticles; Gas sensor; Sensing mechanism
- Citation
- Sensors and Actuators B: Chemical, v.359, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors and Actuators B: Chemical
- Volume
- 359
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/138717
- DOI
- 10.1016/j.snb.2022.131550
- ISSN
- 0925-4005
- 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.
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