Atomic structure and crystalline order of graphene-supported ir nanoparticle lattices.
Atomic structure and crystalline order of graphene-supported ir nanoparticle lattices.
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DOI：
10.1103/physrevlett.110.065503
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发表时间：
2013-02
影响因子：
8.6
通讯作者：
D. Franz;S. Runte;C. Busse;S. Schumacher;T. Gerber;T. Michely;M. Mantilla;V. Kilic;J. Zegenhagen;A. Stierle
中科院分区：
文献类型：
--
作者：
D. Franz;S. Runte;C. Busse;S. Schumacher;T. Gerber;T. Michely;M. Mantilla;V. Kilic;J. Zegenhagen;A. Stierle
我们介绍了在石墨烯/Ir（111）上生长的半高直径为1.5 nm和三层平均高度的Ir纳米颗粒的原子结构。利用表面X射线衍射，我们证明了石墨烯/Ir（111）上的Ir纳米颗粒形成了高度完美的晶体超晶格。超晶格排列使我们能够获得有关纳米颗粒本身原子结构的详细信息，例如尺寸，形状，内部层堆叠和应变。我们的实验揭示了纳米颗粒外延地位于Ir（111）上的石墨烯莫尔结构的顶部，导致显著的横向压缩颗粒内应变。垂直入射X射线驻波实验提供了关于颗粒形成诱导的石墨烯层重构的额外信息。
We present the atomic structure of Ir nanoparticles with 1.5 nm diameter at half height and three layers average height grown on graphene/Ir(111). Using surface x-ray diffraction, we demonstrate that Ir nanoparticles on graphene/Ir(111) form a crystallographic superlattice with high perfection. The superlattice arrangement allows us to obtain detailed information on the atomic structure of the nanoparticles themselves, such as size, shape, internal layer stacking and strain. Our experiments disclose that the nanoparticles reside epitaxially on top of the graphene moiré structure on Ir(111), resulting in significant lateral compressive intraparticle strain. Normal incidence x-ray standing wave experiments deliver additional information on the particle formation induced restructuring of the graphene layer.