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Synthesis and characterization of ultra-small magnetic FeNi/G and NiCo/G nanoparticles

机译：超小磁性FeNi / G和NiCo / G纳米粒子的合成与表征

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摘要

Ultra-small magnetic nanoparticles consisting of NiCo and FeNi alloys enclosed within graphitic shells (NiCo/G and FeNi/G) have been synthesized. The particles, which retained the face centered cubic (fcc) symmetry of the original bulk metals, together with the graphitic coating were characterized by means of aberration corrected scanning transmission electron microscopy (STEM), obtaining mean particle sizes of 2.6nm and 6.2nm for NiCo/G and FeNi/G, respectively. Due to the enhancement of the thermal stability by the graphite shell, the graphite coated FeNi and NiCo were stable under oxygen atmosphere up to 170°C. The effectiveness of the graphite shell was confirmed when unprotected bimetallic FeNi and NiCo were prepared and chemical characterization revealed that more than 60at.% of the samples was oxygen due to the massive oxidation of the bimetallic nanoparticles.
机译：合成了由包裹在石墨壳中的NiCo和FeNi合金组成的超小磁性纳米颗粒（NiCo / G和FeNi / G）。通过像差校正扫描透射电子显微镜（STEM）表征保留了原始大块金属的面心立方（fcc）对称性以及石墨涂层的颗粒，得到的平均粒径为2.6nm和6.2nm。 NiCo / G和FeNi / G。由于石墨壳增强了热稳定性，因此涂覆石墨的FeNi和NiCo在高达170°C的氧气气氛中稳定。当制备未保护的双金属FeNi和NiCo时，石墨壳的有效性得到了证实，化学特征表明，由于双金属纳米颗粒的大量氧化，超过60at。％的样品是氧气。

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