Size- and shape-controlled magnetic (Cr, Mn, Fe, Co, Ni) oxide nanocrystals via a simple and general approach
Size- and shape-controlled magnetic (Cr, Mn, Fe, Co, Ni) oxide nanocrystals via a simple and general approach
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DOI：
10.1021/cm049221k
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发表时间：
2004-10-05
影响因子：
8.6
通讯作者：
Peng, XG
中科院分区：
文献类型：
--
作者：
Jana, NR;Chen, YF;Peng, XG
一个通用的，可重复的，和简单的策略，使用通用的化学品被引入用于控制氧化物纳米晶体的尺寸，形状和尺寸分布。反应体系通常由金属脂肪酸盐、相应的脂肪酸和烃溶剂组成。该方法基于金属脂肪酸盐的热解，金属脂肪酸盐是与非水溶液相容的最常见金属化合物。在一个大的尺寸范围内（3-50 nm）的近单分散的Fe 3 O 4纳米晶体的合成开发作为模型系统。该方法进一步应用于第四行中的其他磁性金属的氧化物纳米晶体的生长-Cr2 O3、MnO、Co 3 O 4和NiO纳米晶体。通过改变前体的反应性和浓度来实现纳米晶体的尺寸和形状控制。通过改变配体脂肪酸的链长和浓度来调节反应性。当给定的金属脂肪酸盐在选定的反应条件下没有足够的活性时，醇或伯胺可用作活化试剂。
A general, reproducible, and simple strategy using generic chemicals is introduced for controlling the size, shape, and size distribution of oxide nanocrystals. The reaction system was generally composed of the metal fatty acid salts, the corresponding fatty acids, and a hydrocarbon solvent. The method is based on the pyrolysis of metal fatty acid salts, the most common metal compounds compatible with nonaqueous solutions. Synthesis of nearly monodisperse Fe3O4 nanocrystals in a large size range (3-50 nm) was developed as the model system. The method was further applied for the growth of oxide nanocrystals of the other magnetic metals in the fourth row-Cr2O3, MnO, Co3O4, and NiO nanocrystals. The size and shape control of the nanocrystals were achieved by varying the reactivity and concentration of the precursors. The reactivity was tuned by changing the chain length and concentration of the ligands, the fatty acids. Alcohols or primary amines could be used as the activation reagents when a given metal fatty acid salt was not sufficiently active under selected reaction conditions.