Faceted Colloidal Au/Fe3O4 Binary Supracrystals Dictated by Intrinsic Lattice Structures and Their Collective Optical Properties,The Journal of Physical Chemistry C

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Faceted Colloidal Au/Fe3O4 Binary Supracrystals Dictated by Intrinsic Lattice Structures and Their Collective Optical Properties
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-06-24 , DOI: 10.1021/acs.jpcc.0c02984
Jinjie Hao ₁ , Yanzhao Yang _{1,

2} , Fenghua Zhang ₁ , Zhijie Yang _{1,

3} , Jingjing Wei ₁

Affiliation

Although self-assembly of binary nanocrystal mixtures into long-range ordered crystalline films with tunable lattice structures are well-known, it would be interesting to shape these binary nanocrystal supracrystals into faceted assemblies because it potentially provides the shape-dependent optical, electronic, and catalytic properties. Herein, we report the self-assembly of binary nanocrystal supracrystals with faceted morphologies from Fe₃O₄ and Au binary mixtures. The asymmetric crystal parameters in AlB₂-type structure, a = b > c, favors one-dimensional (1D) self-assembly along the ⟨001⟩ direction, resulting in the formation of supraspindles and suprarods with 20 facets. For the symmetric cubic lattice system, like NaCl-type and NaZn₁₃-type structures, truncated cube/octahedron with preferential exposed facets of (100) and (111) are produced. By contrast, for another cubic lattice of bcc-AB₆, in which large nanocrystals are ordered into body-centered-cubic (bcc) structure, truncated rhombic dodecahedra enclosed with (110) and (100) are made. The shape-controlled assembly of binary nanocrystal supracrystals composed of plasmonic Au nanocrystals enables engineering the plasmonic near field coupling in binary nanocrystal supracrystals dispersed in water.

中文翻译：

本征晶格结构决定的刻面胶体Au / Fe ₃ O ₄二元超晶体及其集体光学性质

尽管将二元纳米晶体混合物自组装为具有可调晶格结构的长程有序晶体膜是众所周知的，但将这些二元纳米晶体超晶体成型为多面组装将是有趣的，因为它可能提供与形状有关的光学，电子和催化性能。在此，我们报道了由Fe ₃ O ₄和Au二元混合物的多面形态的二元纳米晶体超晶体的自组装。AlB ₂型结构的非对称晶体参数，a = b > c，倾向于沿⟨001方向进行一维（1D）自组装，从而形成具有20个小平面的超主轴和超杆。对于对称立方晶格系统，如NaCl型和NaZn ₁₃型结构，会生成具有（100）和（111）优先暴露面的截头立方体/八面体。相比之下，对于另一种bcc -AB ₆立方晶格，其中大的纳米晶体被排列成体心立方（bcc）结构，制成了被（110）和（100）包围的截头菱形十二面体。由等离子Au纳米晶体组成的二元纳米晶体超晶体的形状控制组装使得能够工程化分散在水中的二元纳米晶体超晶体中的等离激元近场耦合。

更新日期：2020-07-09

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