Bowl-shaped graphene oxide/Fe3O4 composites on Au-PCB electrode for electrochemical detection of dopamine
- Authors
- Zhong, Linlin; Xu, Hui; Yu, Zhifen; Yun, Kyusik
- Issue Date
- Aug-2020
- Publisher
- SPRINGER HEIDELBERG
- Keywords
- Fe3O4; Graphene oxide; Electrochemistry; Dopamine
- Citation
- IONICS, v.26, no.8, pp.4171 - 4181
- Journal Title
- IONICS
- Volume
- 26
- Number
- 8
- Start Page
- 4171
- End Page
- 4181
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/68819
- DOI
- 10.1007/s11581-020-03532-6
- ISSN
- 0947-7047
- Abstract
- A novel bowl-shaped GO/Fe3O4 composite with large specific surface area was prepared by cold quenching. Remarkably, bowl-shaped GO/Fe3O4 composites on gold printed circuit board (Au-PCB) electrode exhibited a high electrochemical activity towards the detection of dopamine, which displayed an oxidation peak at 0.45 V due to the oxidation of dopamine to dopamine-o-quinone and a reduction peak at 0.37 V derived from the reduction of dopamine-o-quinone to dopamine. The interaction between GO/Fe3O4 composites and dopamine can be strengthened via pi-pi stacking forces and electrostatic interactions due to the aromatic rings of graphene oxide (GO) and H-bonding via the functional groups of dopamine. The lower limit of detection (LOD) for dopamine was found to be about 0.023 mu\M. The GO/Fe3O4 composite showed excellent sensitivity in dopamine detection in the presence of ascorbic acid and uric acid. Therefore, the GO/Fe3O4 composite modified Au-PCB electrode for the detection of dopamine could be achieved in practical applications.
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