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首页> 外文期刊>Crystal growth & design >Increasing the size of Fe3-delta O4 Nanoparticles by Performing a Multistep Seed-Mediated Growth Approach
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Increasing the size of Fe3-delta O4 Nanoparticles by Performing a Multistep Seed-Mediated Growth Approach

机译：通过进行多步骤种子介导的生长方法增加Fe3-Delta O4纳米颗粒的大小

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摘要

Iron oxide nanoparticles were synthesized by an original multistep seed-mediated growth approach. The thermal decomposition of an iron stearate precursor was performed successively up to 5 times to produce nanoparticles with a narrow size distribution from 6.4 to 15.0 nm. The chemical composition and crystal structure of each set of nanoparticles was characterized by TEM, FT-IR, XRD, and Mossbauer spectrometry. Each layer was successively grown at the surface of a pristine Fe3-delta O4 nanoparticle by epitaxial relationship and resulted in a single crystal structure. An intermediate wash after each thermal decomposition step resulted in the surface oxidation of each layer. Therefore, the maghemite phase increased relative to the magnetite phase as the nanoparticle expanded. Finally, the study of the magnetic properties by SQUID magnetometry showed the trend of the magnetic anisotropy energy to increase as a function of the nanoparticle size. In contrast, the coercive field and the magnetization saturation display nonmonotonic variations that may result from the interplay of intrinsic and collective properties.
机译：通过原始多步种子介导的生长方法合成氧化铁纳米颗粒。铁硬脂酸盐前体的热分解连续进行高达5次以产生纳米颗粒，尺寸分布的纳米颗粒分布从6.4-15.0nm。每组纳米颗粒的化学成分和晶体结构的特征在于TEM，FT-IR，XRD和Mossbauer光谱法。通过外延关系连续地在原始Fe3-ΔO4纳米粒子的表面上连续生长每层，并导致单晶结构。每个热分解步骤后的中间洗涤导致每层的表面氧化。因此，随着纳米颗粒的膨胀，Maghemite相对于磁铁矿相增加。最后，通过鱿鱼磁体对磁性的研究显示磁各向异性能量的趋势随着纳米颗粒尺寸的函数而增加。相反，矫顽场和磁化饱和度显示出可能由内在和集体特性的相互作用产生的非单调变化。

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  • 来源
    《Crystal growth & design》 |2020年第3期|共11页
  • 作者

    Sartori Kevin; Gailly Diane; Bouillet Corinne; Greneche Jean-Marc; Duenas-Ramirez Paula; Begin-Colin Sylvie; Choueikani Fadi; Pichon Benoit P.;

  • 作者单位

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS F-67000 Strasbourg France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS F-67000 Strasbourg France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS F-67000 Strasbourg France;

    Univ Maine IMMM UMR CNRS 6283 F-72085 Le Mans France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS F-67000 Strasbourg France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS F-67000 Strasbourg France;

    Synchrotron SOLEIL F-91192 Gif Sur Yvette France;

    Univ Strasbourg Inst Phys &

    Chim Mat Strasbourg UMR 7504 CNRS F-67000 Strasbourg France;

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  • 正文语种 eng
  • 中图分类 晶体学;
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