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Α‐Fe2O3 nanostructures: Bridging morphology with magnetic and antimicrobial properties
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Type
Article
Citation
Krishna, A. M. S., George, N., Lavanya, V., Kumar, D., Chaurasiya, A., Hasibur Rahaman, Piramanayagam, S. N., Rawat, R. S., Dalapati, G. K., Ball, W. B., Ghosh, S., & Chakrabortty, S. (2025). Α‐Fe2O3 nanostructures: Bridging morphology with magnetic and antimicrobial properties. ChemNanoMat. Advance online publication. https://doi.org/10.1002/cnma.202500066
Author
Krishna, Ambati Mounika Sai
•
George, Nilja
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Lavanya, Vadupu
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Kumar, Durgesh
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Chaurasiya, Avinash
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Hasibur Rahaman
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Piramanayagam, S. N.
•
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Dalapati, Goutam Kumar
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Ball, Writoban Basu
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Ghosh, Siddhartha
•
Chakrabortty, Sabyasachi
Abstract
Highly crystalline hematite (α-Fe2O3) nanostructures (NSs) with distinct morphology hold vital significance, not only for fundamental knowledge of magnetic properties but also offering potential applications from biomedical to data storage to semiconductor industry etc. α-Fe2O3 NSs with various shapes were examined to reveal the intrinsic relationship between the shape anisotropy and magnetic properties. In this study, we synthesized different morphologies of α-Fe2O3 NSs, such as spherical, cubic, plate-like, rhombohedral, and hexagonal bipyramid, by controlled hydrothermal method. We analysed the impact of shape and size on the optical and structural characteristics through UV-Visible absorption spectroscopy and X-ray diffraction (XRD). Advanced nanomaterial techniques such as Transmission electron microscopy (TEM) is utilized to explore and confirm the morphology and size of NSs. Subsequently magnetic properties of the α-Fe2O3 NSs, such as magnetic saturation (Ms), coercivity (Hc) and remanent magnetization (Mr), were measured. Careful analysis of magnetic data reveal Morin transition around 200 K for cubic, plate-like & rhombohedral samples, whereas the spherical and hexagonal bi-pyramid samples illustrate the superparamagnetic behaviour in the temperature range of 150 K to 300 K. Finally, we investigated the antibacterial characteristics of NSs against Escherichia coli (E. coli) using microplate reader for monitoring the bacterial growth.
Date Issued
2025
Publisher
Wiley
Journal
ChemNanoMat