Gram-scale synthesis, thermal stability, magnetic properties, and microwave absorption application of extremely small Co-C core-shell nanoparticles
Gram-scale synthesis, thermal stability, magnetic properties, and microwave absorption application of extremely small Co-C core-shell nanoparticles
复制标题
极小Co-C核壳纳米粒子的克级合成、热稳定性、磁性能及微波吸收应用
DOI：
10.1088/2053-1591/aa7ad3
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发表时间：
2017
影响因子：
2.3
通讯作者：
Wang Shiliang
中科院分区：
文献类型：
--
作者：
Kuang Daitao;Hou Lizhen;Yu Bowen;Liang Bingbing;Deng Lianwen;Huang Han;Ma Songshan;He Jun;Wang Shiliang
Co-C核-壳纳米颗粒已经通过金属有机化学气相沉积以分析用乙酰丙酮钴（III）作为前体大量合成（以克计）。根据沉积区域，获得了平均核直径为3 nm且壳厚度为1- 2nm的极小纳米颗粒，以及平均核直径为23 nm且壳厚度为5-20 nm的相对大的纳米颗粒。3 nm的Co纳米核在空气气氛中热稳定至200 ℃，并且在室温下暴露于空气180 d后没有表现出可见的结构和形态变化。极小的核-壳纳米粒子表现出典型的超顺磁性行为，具有5 Oe的小磁致伸缩性，而相对较大的纳米粒子是典型的铁磁材料，具有1.5 Oe的高磁致伸缩性。
Co–C core–shell nanoparticles have been synthesized in large quantity (in grams) by metal-organic chemical vapor deposition with analytical cobalt (III) acetylacetonate as precursor. Extremely small nanoparticles with an average core diameter of 3 nm and a shell thickness of 1–2 nm, and relatively large nanoparticles with an average core diameter of 23 nm and a shell thickness of 5–20 nm were obtained, depending on the deposition regions. The 3 nm Co nanocores are thermally stable up to 200 C in air atmosphere, and do not exhibit visible structural and morphological changes after exposure to air at room temperature for 180 d. The extremely small core–shell nanoparticles exhibit typical superparamagnetic behaviors with a small coercivity of 5 Oe, while the relative large nanoparticles are a typical ferromagnetic material with a high coercivity of