Sub 5 nm magnetite nanoparticles: Synthesis, microstructure, and magnetic properties
Sub 5 nm magnetite nanoparticles: Synthesis, microstructure, and magnetic properties
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DOI：
10.1016/j.matlet.2006.11.032
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发表时间：
2007-06
影响因子：
3
通讯作者：
Junhua Wu;S. Ko;Hong Ling Liu;Sangsig Kim;Jae-seon Ju;Young Keun Kim
中科院分区：
文献类型：
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作者：
Junhua Wu;S. Ko;Hong Ling Liu;Sangsig Kim;Jae-seon Ju;Young Keun Kim
通过经济的、生物相容的化学共沉淀路线合成了2-4 nm的磁铁矿颗粒，其尺寸由反应温度调节。采用X射线衍射（XRD）和高分辨透射电子显微镜（HRTEM）表征了纳米粒子的微观结构和形貌，采用振动样品磁强计（VSM）和超导量子干涉仪（SQUID）研究了纳米粒子的磁性能。结果发现，纳米粒子表现出良好定义的超顺磁性行为制备和退火后。观察到明显的晶格，这表明这种超小颗粒的高结晶度，并通过分析相应的微观结构和磁性揭示了有限尺寸效应。
Magnetite particles of 2–4 nm were synthesized by an economic, biocompatible chemical coprecipitation route, with their size tuned by the reaction temperature. The microstructure and morphology of the nanoparticles were characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), whereas the magnetic properties were investigated by vibrating sample magnetometry (VSM) and superconducting quantum interference device (SQUID). It is found that the nanoparticles demonstrate well-defined superparamagnetic behavior as prepared and after annealing. Distinct lattices were observed which manifest the high crystallinity of such ultrasmall particles and the finite-size effect was revealed by analyzing the corresponding microstructure and magnetism.