Abstract
In this work, magnetoresistive nanomagnetite@polyaniline (Fe3O4@PANI) composites with a core-shell structure were prepared by in situ polymerization method with KH-550 as coupling agent. All the samples demonstrated the positive MR, and compared with PANI composites reinforced with small (diameter 80 nm) size or large (diameter 450 nm) size of Fe3O4, the PANI composites reinforced with medium (diameter 220 nm) size of Fe3O4 exhibit the largest MR (8.41%) when the MK-F loading is 60 wt%. Moreover, the size effect of Fe3O4 particles on the electrical conductivity and MR behavior was analyzed by the Mott VRH model and wave functional shrinkage model. The MR value of Fe3O4@PANI composites with different loading and size of Fe3O4 particles mainly depends on localization length, density of state at Fermi level, and average hopping length. Moreover, the Fe3O4@PANI composites were systematically characterized by SEM, TEM, XRD, and FT-IR. This work could provide the guidance for fabrication of magnetic field sensors and information memory storage devices.
Graphical Abstract
The core-shell structured magnetite/polyaniline nanocomposites with tunable magnetoresistance by changing the size of magnetite nanoparticle.
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Acknowledgements
The authors extend their appreciation to the Deanship of Scientific Research at Northern Border University, Arar, KSA, for funding this research work through the project number (NBU-FPEJ-2024-540-01).
Funding
This work is supported by the Natural Science Foundation of China (grant no. 62304126; 51972200; U23B2084), the Natural Science Basic Research Program of Shaanxi (program no. 2022JQ-441; 2022JM-285), Foreign Expert Project of Ministry of Science and Technology of China (Program no. G2023041005L), the Key Scientific Research Program of Shaanxi Province Education Department (No. 23JY011), and the Research Foundation for Thousand Young Talent Plan of Shaanxi province of China.
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Shaohua Xi synthesized the materials and conducted most of the measurements and data analysis. Jiang Guo conceived the idea, wrote the paper, and coordinated the overall project. Yukun Sun and Wenhao Dong contributed to the data analysis. Yazeed M. Asiri, Nawal D. Alqarni, and Mohamed H. Helal revised the paper. Fujian Zhou reviewed and revised the manuscript. Jianfeng Zhu provided supervision and resources. All authors reviewed the manuscript.
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Guo, J., Xi, S., Sun, Y. et al. Size effect of nanomagnetite on magnetoresistance of core-shell structured polyaniline nanocomposites. Adv Compos Hybrid Mater 7, 62 (2024). https://doi.org/10.1007/s42114-024-00868-9
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DOI: https://doi.org/10.1007/s42114-024-00868-9