Synthesis of Hexagonal Close-Packed Cobalt Nanoparticles From Thermolysis of Cobalt Carbonyl

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Kyohei Takahashi;Hiroshi Ito;Isao Kanada;Hiroyuki Matsumoto
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Abstract

Magnetic materials with low magnetic loss are required to realize both a high-frequency support and a miniaturization of radio frequency components. Hexagonal close-packed cobalt (hcp-Co) nanoparticles are considered suitable for high frequencies due to their nanoparticle morphology and high magnetocrystalline anisotropy. However, the face-centered cubic (fcc) or the ϵ phase with low magnetocrystalline anisotropy is fabricated in the synthetization of Co nanoparticles with a size of less than a few hundred nanometers. In this letter, we investigate the synthesis of Co nanoparticles by the thermolysis of dicobalt octacarbonyl at various temperatures for obtaining Co particles with a single hcp phase. Although Co nanoparticles synthesized at 453 K exhibited a mixture of hcp and fcc phases with an hcp phase ratio of 25%, Co nanoparticles almost achieved the hcp phase ratio of 100% by decreasing the thermolysis temperature to 333 K or lower. Furthermore, we evaluated the permeability spectrum of the composite with Co particles of 10 vol% dispersed in polystyrene. Although the real part of the permeability in the composite containing Co nanoparticles with the mixed phase of fcc and hcp monotonously decreased with frequency, the composite contained Co nanoparticles with a single phase with a suitable constant value up to 3 GHz for high-frequency applications.
羰基钴热裂解制备六角紧密堆积钴纳米粒子
需要具有低磁损耗的磁性材料来实现射频部件的高频支撑和小型化。六角紧密堆积的钴(hcp-Co)纳米颗粒由于其纳米颗粒形态和高磁晶各向异性而被认为适用于高频。然而,在合成尺寸小于几百纳米的Co纳米颗粒的过程中,制备了具有低磁晶各向异性的面心立方(fcc)或ε相。在这封信中,我们研究了通过在不同温度下热解八羰基二钴来合成Co纳米颗粒,以获得具有单一hcp相的Co颗粒。尽管在453K下合成的Co纳米颗粒表现出hcp和fcc相的混合物,hcp相比率为25%,但通过将热解温度降低到333K或更低,Co纳米颗粒几乎实现了100%的hcp相比例。此外,我们评估了具有分散在聚苯乙烯中的10体积%的Co颗粒的复合材料的渗透光谱。尽管含有具有fcc和hcp混合相的Co纳米颗粒的复合材料中的磁导率的实部随着频率单调降低,但对于高频应用,该复合材料含有具有高达3GHz的合适恒定值的单相Co纳米颗粒。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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