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Tuning crystal structure and magnetic property of dispersible FePt intermetallic nanoparticles

单分散FePt金属间化合物纳米颗粒的可调化学结构和磁性能

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Abstract

Dispersible FePt intermetallic nanoparticles (NPs) with tunable composition were synthesized by thermal annealing of MgO coated Al-FePt (or Al-FePt-Fe3O4) NPs followed by an acid treatment to remove MgO. High-temperature annealing facilitates the conversion of FePt from disordered alloy to ordered intermetallics. Under the protection of MgO, the diffusion of Fe and Pt atoms was limited, making it possible for the atom reconstruction in the lattice to give discrete FePt intermetallic NPs after a facile acid etching process. FePt intermetallic NPs formed face-centered cubic and face-centered tetragonal structures with their magnetic properties tuned by composition. The saturation magnetization was adjusted from 8 to 52 emu g−1 by increasing the Fe concentration, while the coercivity reached a maximum of 33 kOe when Fe concentration was 44%. After surface modifications by hydrophilic or hydrophobic molecules containing thiol groups, FePt intermetallic NPs could be dissolved into water or hydrocarbon solvents. The hydrophilic L10-FePt intermetallic NPs were applied as contrast agents for magnetic resonance imaging, showing a high transverse relaxivity of 328.6 mmol−1 L s−1, which indicated the great potential of FePt intermetallic NPs as molecular probes for cancer diagnosis.

摘要

具有可调组分的单分散FePt金属间化合物纳米颗粒由MgO包覆的Al-FePt(或者Al-FePt-Fe3O4)经过热退火, 再通过酸处理除去MgO制备得到. 高温退火有助于FePt从无序合金转变为有序金属间化合物. 在MgO的保护下, Fe和Pt的扩散受到限制, 因而晶格中的Fe、 Pt原子能够重构形成FePt金属间化合物, 再通过简单的酸腐蚀可得到分散的纳米颗粒. FePt金属间化合物纳米颗粒形成面心立方和面心四方结构, 通过组分调节可以改变其磁性能. 随着铁含量的增加, 其饱和磁化强度从8 emu g−1提高到52 emu g−1, 在铁含量为44%时, 矫顽力达到最大值33 kOe. 利用含巯基分子对纳米颗粒表面进行亲水或疏水性改性, FePt金属间化合物纳米颗粒可以溶于水和烃类溶剂. 亲水的L10-FePt金属间化合物纳米颗粒可作为磁共振成像造影剂, 表现出高的横向弛豫率(328.6 mmol−1 L s−1), 这表明FePt金属间化合物纳米颗粒有望用于肿瘤诊断的分子探针.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51602285, 51590882, 51631001, 51672010 and 81421004), the National Key R&D Program of China (2017YFA0206301), the Key Laboratory of Biomedical Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and technology, Chinese Academy of Sciences (NSKF201607).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China

    Jing Yu  (余靓), Weiliang Gao  (高伟良), Fan Zhao  (赵帆) & Shenglei Che  (车声雷)

  2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China

    Jing Yu  (余靓), Fei Liu  (刘飞), Yanmin Ju  (鞠艳敏), Ziyu Yang  (杨子煜), Xin Chu  (储鑫) & Yanglong Hou  (侯仰龙)

  3. Department of Materials Science and Engineering, Iowa State University of Science and Engineering, Ames, 50011, USA

    Fei Liu  (刘飞)

Authors
  1. Jing Yu  (余靓)
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  2. Weiliang Gao  (高伟良)
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  3. Fei Liu  (刘飞)
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  6. Ziyu Yang  (杨子煜)
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  7. Xin Chu  (储鑫)
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  8. Shenglei Che  (车声雷)
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  9. Yanglong Hou  (侯仰龙)
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Correspondence to Fei Liu  (刘飞), Shenglei Che  (车声雷) or Yanglong Hou  (侯仰龙).

Additional information

Jing Yu received her PhD degree in advanced materials and mechanics from Peking University in 2015. She is now a faculty in the College of Materials Science and Engineering, Zhejiang University of Technology. Her current research focuses on the synthesis and biomedical applications of nanoparticles.

Fei Liu received his PhD degree in advanced materials and mechanics from Peking University in 2015. He is now a postdoctoral researcher in the Department of Materials Science and Engineering, Iowa State University of Science and Engineering. His current research focuses on the synthesis and self-assembly of nanoparticles.

Shenglei Che received his PhD degree in inorganic materials from Tokyo Institute of Technology, Japan, in 1997. He is now a chair professor in the College of Materials Science and Engineering, Zhejiang University of Technology. His research interests include powder, bulk and composite materials for magnetic and electronic uses.

Yanglong Hou received his PhD in materials science from Harbin Institute of Technology in 2000. After a short postdoctoral training at Peking University, he worked at the University of Tokyo from 2002–2005 as JSPS foreign special researcher and also at Brown University from 2005–2007 as postdoctoral researcher. He joined Peking University in 2007, and now is a professor of materials science. His research interests include the design and chemical synthesis of functional nanoparticles, and their biomedical and energy related applications.

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Yu, J., Gao, W., Liu, F. et al. Tuning crystal structure and magnetic property of dispersible FePt intermetallic nanoparticles. Sci. China Mater. 61, 961–968 (2018). https://doi.org/10.1007/s40843-017-9203-9

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  • DOI: https://doi.org/10.1007/s40843-017-9203-9

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