期刊
MATERIALS RESEARCH BULLETIN
卷 133, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2020.111050
关键词
alpha-Fe(2)O(3)mesocrystals; Reduced graphene oxide; Electrochemical sensor; Dopamine detection
资金
- National Natural Science Foundation of China [61703152]
- Natural Science Foundation of Hunan Province [2019JJ50127, 2018JJ3134, 2019JJ50137]
- Scientific Research Foundation of Hunan Provincial Education Department [19C0538, 18A273, 18C0522]
- Project of Foshan Engineering Research Centre [20172010018]
- Key Disciplines' Construction Opening Fund of Foshan University [CGS06021]
- Project of Science and Technology Plan in Zhuzhou [201707201806]
- Postgraduates Innovation Fund of School of Life Science and Chemistry in Hunan University of Technology
- Doctoral Program Construction of Hunan University of Technology
By developing a spindle-like α-Fe2O3/reduced-graphene-oxide composite modified glassy carbon electrode, a highly sensitive electrochemical detection method for DA has been established. The method shows high sensitivity, wide linear detection range, and successful detection of DA in real human serum samples.
In this study, spindle-like alpha-Fe2O3 mesocrystals/reduced-graphene-oxide composites modified glassy carbon electrode (alpha-Fe2O3/rGO/GCE) is developed for ultrasensitive electrochemical detection of DA. Morphologies and crystal structures of this composite are characterized by SEM, TEM, XRD, Raman spectrum, and XPS, respectively. The electrochemical behavior of DA on these electrodes are investigated by CV and EIS. The electrochemical conditions are optimized systematically. As results, the oxidation current of DA on alpha-Fe2O3/rGO/GCE is 38.13-fold increase than that on bare GCE. It is ascribed to the high catalytic activity of alpha-Fe2O3 mesocrystals and large electrochemical active area of rGO. Under the best voltammetric condition, wide linear detection range (from 1.0x10(-8) to 9.0x10(-4) mol/L) and low LOD of 3.26 nM (S/N=3) are obtained on the alpha-Fe2O3/rGO/GCE. Furthermore, this electrode is also used for DA detection in real human serums samples successfully. This alpha-Fe2O3/rGO/GCE provides a good example in design of other mesocrystals-based composite materials for electrochemical detection.
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