Controlling the crystal structure of Ni nanoparticles by the use of alkylamines
Controlling the crystal structure of Ni nanoparticles by the use of alkylamines
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DOI：
10.1016/j.jmmm.2009.03.076
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发表时间：
2009-09-01
影响因子：
2.7
通讯作者：
Kalogirou, O.
中科院分区：
文献类型：
--
作者：
Mourdikoudis, S.;Simeonidis, K.;Kalogirou, O.
在长链胺类溶剂和还原剂的共同作用下，通过四水合乙酸镍的热分解制备了镍纳米粒子。通过调节反应温度，得到了具有hcp和fcc晶体结构的镍纳米结构。原则上，较高的温度有利于hcp纳米颗粒的形成。采用额外的表面活性剂，如1-金刚烷羧酸和三辛基精氨酸氧化物促进调整的颗粒的生长极限。颗粒的尺寸在5和120 nm之间变化。fcc-Ni纳米颗粒的磁性特征与相应的“块状”纳米颗粒非常相似。另一方面，hcp-Ni颗粒表现出弱磁性特征，反映了低磁化强度值，饱和磁化强度的情况下，并通过阻塞温度低于室温。(C)2009，Elsevier B. V.保留所有权利。
Ni nanoparticles were prepared via thermal decomposition of nickel acetate tetrahydrate in the presence of long-chain amines, which acted as both solvents and reducing agents. By tuning the reaction temperature, Ni nanostructures with either hcp of fcc crystal structure were obtained. In principle, higher temperatures favored the formation of hcp nanoparticles. The employment of additional surfactants such as 1-adamantanecarboxylic acid and trioctylphosine-oxide facilitated the tuning of the particle's growth limit. The size of the particles varied between 5 and 120 nm. The magnetic features of fcc-Ni nanoparticles were quite similar to the corresponding 'bulk' ones. On the otherhand, the hcp-Ni particles showed weak magnetic features, reflected by low magnetization values, the absence of saturation magnetization and by blocking temperatures for below room temperature. (C) 2009, Elsevier B.V. All rights reserved.