Versatile chemical sensors using oligosaccharides on cleanable PDMS/graphene hybrids for monitoring environmentally hazardous substances
- Authors
- Bae J.; Hwang Y.; Ha J.-H.; Kwon O.S.; Jang A.; Kim H.J.; An J.; Lee C.-S.; Park S.-H.
- Issue Date
- Mar-2020
- Publisher
- Elsevier B.V.
- Keywords
- Chemical sensor; Cyclodextrin; Graphene; Inclusion complex; Oligosaccharide; Poly(dimethylsiloxane)
- Citation
- Applied Surface Science, v.507
- Journal Title
- Applied Surface Science
- Volume
- 507
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/35606
- DOI
- 10.1016/j.apsusc.2019.145139
- ISSN
- 0169-4332
- Abstract
- A versatile chemical sensor possessing a nontoxic sensing medium was produced for the detection of chemical environmental hazards. Poly(dimethylsiloxane) (PDMS)/graphene (GR) hybrids were employed as sensor substrates owing to their high electrical conductivity. The PDMS/GR hybrid substrates exhibited a significant change in electrical threshold above 1.2 wt% GR loading. Oligosaccharides, such as beta-cyclodextrin (beta-CD), were introduced and used as sensing media for the detection of potentially hazardous molecules. The successful introduction of the sensing medium was confirmed by a variety of instrumental analyses. The sensor signal generated by addition of target analyte originated from charge transport associated with the formation of beta-CD-analyte inclusion compounds, which were monitored by ultraviolet (UV) spectroscopy. The performance of this sensor system was examined using various concentrations of a model analyte, methyl paraben (MePRB), and yielded a limit of detection of approximately 10 nM. © 2019
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