金纳米晶体与硅纳米晶体二元超晶格的自组装及热稳定性
Self-Assembly and Thermal Stability of Binary Superlattices of Gold and Silicon Nanocrystals.
作者信息
Yu Yixuan, Bosoy Christian A, Smilgies Detlef-M, Korgel Brian A
机构信息
Department of Chemical Engineering, Texas Materials Institute and Center for Nano- and Molecular Science and Technology, The Univiersity of Texas at Austin, Austin, Texas, 78712-1062, United States.
出版信息
J Phys Chem Lett. 2013 Oct 14;4(21). doi: 10.1021/jz401964s.
Simple hexagonal (sh) AB binary superlattices (BSLs) of organic ligand-capped silicon (A; 5.40(±9.8%) nm diameter) and gold (B; 1.88(±10.1%) nm diameter) nanocrystals were assembled by evaporation of colloidal dispersions and characterized using transmission electron microscopy (TEM) and grazing incidence small-angle X-ray scattering (GISAXS). When deposited on tilted substrates by slow evaporation, the sh-AB superlattice contracts slightly towards the substrate with centered orthorhombic structure. Heating the BSL to 200°C in air led to gold coalescence and segregation to the surface of the assembly without disrupting the Si nanocrystal sublattice, thus creating a simple hexagonal superlattice of Si nanocrystals.
通过蒸发胶体分散体组装了由有机配体包覆的硅（A；直径5.40(±9.8%)纳米）和金（B；直径1.88(±10.1%)纳米）纳米晶体构成的简单六方（sh）AB二元超晶格（BSL），并使用透射电子显微镜（TEM）和掠入射小角X射线散射（GISAXS）对其进行了表征。当通过缓慢蒸发沉积在倾斜基板上时，sh-AB超晶格会朝着具有中心正交结构的基板轻微收缩。在空气中将BSL加热到200°C会导致金聚结并偏析到组件表面，而不会破坏硅纳米晶体亚晶格，从而形成硅纳米晶体的简单六方超晶格。
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