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3D hierarchical hollow hydrangea-like Fe3+@ɛ-MnO2 microspheres with excellent electrochemical performance for
Haiyan Song1, Hui Zhao2, Xianfa Zhang2
1Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China; Laboratory of Test Center, Jilin Agricultural Science and Technology College, Jilin 132101, China.
Abstract:
Construction a sensor to accurately detect dopamine (DA) and hydrogen peroxide (H2O2) is meaningful due to their close relation to the health of organisms. In this work, one-step hydrothermal method was employed to synthesize hierarchical hollow hydrangea-like Fe3+@ɛ-MnO2 microspheres constructed by interconnected nanosheets, and the growth mechanism of the microspheres (nFe/nMn = 0.6) was also investigated in detail. The material was used to construct an electrochemical sensor for DA and H2O2 detection with the linear range of 0.02-78 μmoL-1 and 0.000133-5.19 mmoL-1, respectively. The detection limit and sensitivity for DA and H2O2 are 5 and 50 nmoL-1 (S/N = 3), 7034.1 and 242.6 µA m(mol·L-1)-1 cm-2, respectively. Furthermore, the sensor was successfully applied to the detection of DA and H2O2 in serum and urine samples, indicating a potential value of this work in the pharmaceutical and environmental fields.
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