Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process
Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process
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DOI：
10.1021/ja016812s
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发表时间：
2001-12-26
影响因子：
15
通讯作者：
Bin Na, H
中科院分区：
文献类型：
--
作者：
Hyeon, T;Lee, SS;Bin Na, H
报道了高结晶度且单分散的γ - Fe₂O₃纳米微晶的合成。在油酸存在下，于100℃热分解五羰基铁制备的铁 - 油酸金属配合物，经300℃高温陈化后生成单分散的铁纳米粒子。使用三甲胺氧化物作为温和氧化剂，通过可控氧化将所得铁纳米粒子转化为单分散的γ - Fe₂O₃纳米微晶。通过控制实验参数，粒子尺寸可在4到16纳米之间变化。粒子的透射电子显微镜图像显示了粒子的二维和三维组装，证明了这些纳米粒子的均匀性。纳米粒子的电子衍射、X射线衍射以及高分辨率透射电子显微镜（TEM）图像表明了γ - Fe₂O₃结构的高结晶性。在油酸存在下，以三甲胺氧化物作为氧化剂直接氧化五羰基铁，也可生成粒径为13纳米的单分散γ - Fe₂O₃纳米微晶。
The synthesis of highly crystalline and monodisperse gamma -Fe2O3 nanocrystallites is reported. High-temperature (300 degreesC) aging of iron-oleic acid metal complex, which was prepared by the thermal decomposition of iron pentacarbonyl in the presence of oleic acid at 100 degreesC, was found to generate monodisperse iron nanoparticles. The resulting iron nanoparticles were transformed to monodisperse gamma -Fe2O3 nanocrystallites by controlled oxidation by using trimethylamine oxide as a mild oxidant. Particle size can be varied from 4 to 16 nm by controlling the experimental parameters. Transmission electron microscopic images of the particles showed 2-dimensional and 3-dimensional assembly of particles, demonstrating the uniformity of these nanoparticles. Electron diffraction, X-ray diffraction, and high-resolution transmission electron microscopic (TEM) images of the nanoparticles showed the highly crystalline nature of the gamma -Fe2O3 structures. Monodisperse gamma -Fe2O3 nanocrystallites with a particle size of 13 mn also can be generated from the direct oxidation of iron pentacarbonyl in the presence of oleic acid with trimethylamine oxide as an oxidant.