高温液相还原法制备钴纳米晶及其二维有序阵列

由于小尺寸效应，纳米晶具有独特的电、磁、光学和结构性质，因而在材料领域具有广阔的应用前景，例如，利用磁性金属和半导体纳米晶对尺寸敏感的特性进行超高密度信息磁存储及微电子技术的应用研究．但表面原子的巨大剩余成键能力使其倾向于相互团聚并长大，只有实现纳

Synthesis of Cobalt Nanocrystals by High Temperature Solution Phase Reducing Method and Their Two-dimensional Ordered Superlattices

The monodisperse magnetic cobalt nanocrystals(NCs) of 7 nm in diameter were prepared by using high temperature solution phase reducing method. The UV-Vis spectrum showed that the cobalt NCs was stable. The structure of the cobalt NCs were determined by XRD. The results showed that each of the cobalt nanoparticles is a single crystal with a complex cubic structure relating to the β phase of manganese. The XPS spectra indicate that the surface of Co nanoparticles was not oxidized or formed other compound. Two-dimensional order superlattices of the Co nanoparticles were formed by self-assembly technique.