Incorporation of hydrogel as a sensing medium for recycle of sensing material in chemical sensors
- Authors
- Hwang, Yunjung; Park, Jeong Yong; Kwon, Oh Seok; Joo, Seokwon; Lee, Chang-Soo; Bae, Joonwon
- Issue Date
- 31-Jan-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Hydrogel; Polypyrrole; Aptamer; Sensor; Agarose; Dopamine
- Citation
- APPLIED SURFACE SCIENCE, v.429, pp.258 - 263
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 429
- Start Page
- 258
- End Page
- 263
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/4144
- DOI
- 10.1016/j.apsusc.2017.06.243
- ISSN
- 0169-4332
- Abstract
- A hydrogel, produced with agarose extracted from seaweed, was introduced as a reusable medium in ultrasensitive sensors employing conducting polymer nanomaterials and aptamers. A basic dopamine (DA) sensor was constructed by placing a hydrogel, containing a sensing material composed of aptamerlinked carboxylated polypyrrole nanotubes (PPy-COOH NTs), onto a micropatterned gold electrode. The hydrogel provided a benign electrochemical environment, facilitated specific interactions between DA and the PPy-COOH NT sensing material, and simplified the retrieval of PPy-COOH NTs after detection. It was demonstrated that the agarose hydrogel was successfully employed as a sensing medium for detection of DA, providing a benign environment for the electrode type sensor. PPy-COOH NTs were recovered by simply heating the hydrogel in water. The hydrogel also afforded stable signal intensity after repeated use with a limit of detection of 1 nmol and a clear, stable signal up to 100 nmol DA. This work provides relevant information for future research on reusable or recyclable sensors. (C) 2017 Elsevier B.V. All rights reserved.
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