Concurrent and Selective Determination of Dopamine and Serotonin with Flexible WS2/Graphene/Polyimide Electrode Using Cold Plasma
- Authors
- Kim, Hyeong-U; Koyappayil, Aneesh; Seok, Hyunho; Aydin, Kubra; Kim, Changmin; Park, Kyu-Young; Jeon, Nari; Kang, Woo Seok; Lee, Min-Ho; Kim, Taesung
- Issue Date
- Nov-2021
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- biosensors; dopamine; flexible electrodes; serotonin; WS; (2); graphene heterostructures
- Citation
- SMALL, v.17, no.45
- Journal Title
- SMALL
- Volume
- 17
- Number
- 45
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/50074
- DOI
- 10.1002/smll.202102757
- ISSN
- 1613-6810
1613-6829
- Abstract
- Makers of point-of-care devices and wearable diagnostics prefer flexible electrodes over conventional electrodes. In this study, a flexible electrode platform is introduced with a WS2/graphene heterostructure on polyimide (WGP) for the concurrent and selective determination of dopamine and serotonin. The WGP is fabricated directly via plasma-enhanced chemical vapor deposition (PECVD) at 150 degrees C on a flexible polyimide substrate. Owing to the limitations of existing fabrication methods from physical transfer or hydrothermal methods, many studies are not conducted despite excellent graphene-based heterostructures. The PECVD synthesis method can provide an innovative WS2/graphene heterostructure of uniform quality and sufficient size (4 in.). This unique heterostructure affords excellent electrical conductivity in graphene and numerous electrochemically active sites in WS2. A large number of uniform qualities of WGP electrodes show reproducible and highly sensitive electrochemical results. The synergistic effect enabled well-separated voltammetric signals for dopamine and serotonin with a potential gap of 188 mV. Moreover, the practical application of the flexible sensor is successfully evaluated by using artificial cerebrospinal fluid.
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