Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, USA.
J Phys Chem B. 2012 May 24;116(20):6017-26. doi: 10.1021/jp3015436. Epub 2012 May 10.
Hexagonally ordered close-packed monolayers of sterically stabilized FePt nanocrystals were deposited on substrates using the Langmuir-Blodgett technique. Monolayers of nanocrystals were also stacked by sequential Langmuir-Blodgett transfer. The structures of the nanocrystal monolayers and multilayer stacks were examined with scanning electron microscopy (SEM) and grazing-incidence small-angle scattering (GISAXS). An analytical model derived from the quasikinematic approximation provides a convenient description of the GISAXS data of the stacked layers. The transferred monolayers showed good in-plane hexagonal order, even for trilayers. Bilayers exhibited spatial registry with the top layer positioned above the 3-fold coordinated sites of the bottom layer. Trilayers, on the other hand, exhibited significant disorder.
采用 Langmuir-Blodgett 技术在基底上沉积了具有六方有序密堆积结构的、受空间位阻稳定的 FePt 纳米晶单层膜。通过顺序的 Langmuir-Blodgett 转移也可以将纳米晶单层膜堆叠起来。利用扫描电子显微镜（SEM）和掠入射小角散射（GISAXS）对纳米晶单层膜和多层堆叠结构进行了研究。准动力学近似得出的解析模型可以方便地描述堆叠层的 GISAXS 数据。即使对于三层堆叠，转移的单层膜也表现出良好的面内六方有序性。双层膜表现出与底层的三配位位置在顶部的空间配准。然而，三层膜则表现出明显的无序性。
