Ultra-large-scale syntheses of monodisperse nanocrystals
Ultra-large-scale syntheses of monodisperse nanocrystals
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DOI：
10.1038/nmat1251
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发表时间：
2004-12-01
期刊：
影响因子：
41.2
通讯作者：
Hyeon, T
中科院分区：
文献类型：
--
作者：
Park, J;An, KJ;Hyeon, T
纳米晶体的发展一直在积极追求，不仅是因为它们的基本科学利益，而且还因为许多技术应用。单分散纳米晶体（尺寸变化<5%）的合成是非常重要的，因为这些纳米晶体的性质强烈依赖于它们的尺寸。例如，基于半导体纳米晶体的光学器件的颜色清晰度强烈依赖于纳米晶体的均匀性，和单分散磁性纳米晶体是下一代多太比特磁存储介质的关键。为了使用这些单分散纳米晶体，需要开发经济的大规模生产方法。然而，不幸的是，在迄今为止报道的大多数合成中，仅产生亚克量的单分散纳米晶体。采用胶体化学合成方法制备了尺寸均匀的CdSe（参考文献，）和Au（参考文献，）纳米晶体。此外，还采用多种合成方法合成了单分散磁性纳米晶Fe（refs，）、Co（refs -）、γ-Fe_2O_3（refs，）和Fe_3O_4（refs，）。在这里，我们报告的单分散纳米晶体的超大规模合成使用廉价和无毒的金属盐作为反应物。我们能够合成多达40克的单分散纳米晶体在一个单一的反应，没有一个大小排序过程。此外，可以简单地通过改变实验条件来控制颗粒尺寸。目前的合成程序是非常普遍的，许多过渡金属氧化物的纳米晶体使用非常相似的程序成功地合成。
The development of nanocrystals has been intensively pursued, not only for their fundamental scientific interest, but also for many technological applications,,. The synthesis of monodisperse nanocrystals (size variation <5%) is of key importance, because the properties of these nanocrystals depend strongly on their dimensions. For example, the colour sharpness of semiconductor nanocrystal-based optical devices is strongly dependent on the uniformity of the nanocrystals,,,, and monodisperse magnetic nanocrystals are critical for the next-generation multi-terabit magnetic storage media,,. For these monodisperse nanocrystals to be used, an economical mass-production method needs to be developed. Unfortunately, however, in most syntheses reported so far, only sub-gram quantities of monodisperse nanocrystals were produced. Uniform-sized nanocrystals of CdSe (refs ,) and Au (refs ,) have been produced using colloidal chemical synthetic procedures. In addition, monodisperse magnetic nanocrystals such as Fe (refs ,), Co (refs –), γ-Fe2O3(refs ,), and Fe3O4(refs ,) have been synthesized by using various synthetic methods. Here, we report on the ultra-large-scale synthesis of monodisperse nanocrystals using inexpensive and non-toxic metal salts as reactants. We were able to synthesize as much as 40 g of monodisperse nanocrystals in a single reaction, without a size-sorting process. Moreover, the particle size could be controlled simply by varying the experimental conditions. The current synthetic procedure is very general and nanocrystals of many transition metal oxides were successfully synthesized using a very similar procedure.