Abstract
A facile hydrothermal-calcination process was employed to fabricate Fe3O4/α-Fe2O3 heterogeneous nanosheets utilizing NH4H2PO4 as the restricted growth agent and FeCl3 as the iron source. The morphologies and properties of the obtained nanomaterials were investigated by SEM, XRD, VSM, and TEM techniques. In the hydrothermal process, an H2PO4− concentration of 1.44 mM, Fe3+ concentration of 20 mM, a hydrothermal temperature of 220 °C, and a hydrothermal time of 24 h were selected as the optimal conditions for α-Fe2O3 nanosheets, their average diameter and thickness of the resulting nanosheets were approximately 150 and 53 nm. Subsequently, glucose was utilized as a reducing agent to partially reduce the precursor of α-Fe2O3 to Fe3O4, thereby forming Fe3O4/α-Fe2O3 heterogeneous nanosheets. During the calcination process, the effects of calcination time, calcination temperature, and glucose content on the morphology and properties of the nanosheets were investigated. The morphology and size of the prepared nanosheets did not change significantly during the calcination process, while the magnetic properties of the products underwent significant changes. When the product was calcined at 600 °C for 4 h with a mass ratio of precursor to glucose was 1:12, the saturation magnetization of as-prepared Fe3O4/α-Fe2O3 heterogeneous nanosheets reached the largest of 80 emu/g. The results indicated that the Fe3O4/α-Fe2O3 heterogeneous nanosheets with satisfactory saturation magnetization were successfully fabricated with glucose as the reductant.
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Acknowledgements
The authors wish to thank the Jiangsu Provincial Postgraduate Scientific Practice and Innovation Project (Grant No. SJCX21_1722) and the Science and Technology Innovation Project of CHN Energy (Grant No. GJNY-20-109).
Funding
This work was supported by the Jiangsu Provincial Postgraduate Scientific Practice and Innovation Project (Grant No. SJCX21_1722) and the Science and Technology Innovation Project of CHN Energy (Grant No. GJNY-20-109).
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JW conducted material preparation, data acquisition and analysis, and wrote the first draft of the paper. HO made substantial contributions to the conception or designed of the study and interpretation of data in the study. YN participated in the writing of the first draft of the paper, and the conception and operation of the experimental designed. NH and YY reviewed, revised and edited the article. DZ designed and guided the experimental operation, and put forward rectification suggestions for the article. YL supervised the entire experimental study.
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Wang, J., Ouyang, H., Ni, Y. et al. A Hydrothermal-Calcination Process with Ammonium Dihydrogen Phosphate as Restricted Growth Agent for the Fabrication of Magnetic Fe3O4/α-Fe2O3 Heterogeneous Nanosheets. J Inorg Organomet Polym 34, 1015–1027 (2024). https://doi.org/10.1007/s10904-023-02879-3
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DOI: https://doi.org/10.1007/s10904-023-02879-3