铁纳米颗粒在MCM - 41介孔二氧化硅内的高度各向异性分布。

Highly anisotropic distribution of iron nanoparticles within MCM-41 Mesoporous Silica.

作者信息

Moreno M Sergio, Weyland Matthew, Midgley Paul A, Bengoa José F, Cagnoli Marta V, Gallegos Norma G, Alvarez Ana M, Marchetti Sergio G

机构信息

Materials Department, Centro Atómico Bariloche, 8400 San Carlos de Bariloche, Argentina.

出版信息

Micron. 2006;37(1):52-6. doi: 10.1016/j.micron.2005.06.003. Epub 2005 Jul 14.

DOI:10.1016/j.micron.2005.06.003

PMID:16084103

Abstract

Electron microscopy techniques are used to visualize the spatial distribution of iron nanoparticles inside a mesoporous MCM-41 molecular sieve. Direct observation of the iron oxide nanoparticles by STEM-HAADF imaging reveals a highly non-uniform spatial distribution inside the mesopores. These particles are retained in the pores after a reduction treatment unlike the behavior found in other similar systems. It is found that thermal treatments induce changes in its morphology, creating nanowires from particle strings.

摘要

电子显微镜技术用于观察介孔MCM-41分子筛内铁纳米颗粒的空间分布。通过扫描透射电子显微镜的高角度环形暗场成像（STEM-HAADF）对氧化铁纳米颗粒进行直接观察，结果显示介孔内的空间分布极不均匀。与其他类似体系不同，经过还原处理后，这些颗粒仍保留在孔内。研究发现，热处理会使其形态发生变化，由颗粒串形成纳米线。