Formation of self-assembled gold nanoparticle supercrystals with facet-dependent surface plasmonic coupling

被引：68

作者：

Bian, Kaifu ^{[1
]}

Schunk, Hattie ^{[1
]}

Ye, Dongmei ^{[1
]}

Hwang, Austin ^{[1
]}

Luk, Ting Shan ^{[1
]}

Li, Ruipeng ^{[2
]}

Wang, Zhongwu ^{[3
]}

Fan, Hongyou ^{[1
,4
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87123 USA

[2] Brookhaven Natl Labs, NSLS 2, Upton, NY 11973 USA

[3] Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

[4] Univ New Mexico, Dept Chem & Biol Engn, Albuquerque, NM 87106 USA

来源：

NATURE COMMUNICATIONS | 2018年 / 9卷

关键词：

COLLOIDAL CRYSTALS; NANOCUBE SUPERLATTICES; ENTROPY DIFFERENCE; NANOCRYSTALS; CRYSTALLIZATION; FORCES;

D O I：

10.1038/s41467-018-04801-9

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Metallic nanoparticles, such as gold and silver nanoparticles, can self-assemble into highly ordered arrays known as supercrystals for potential applications in areas such as optics, electronics, and sensor platforms. Here we report the formation of self-assembled 3D faceted gold nanoparticle supercrystals with controlled nanoparticle packing and unique facetdependent optical property by using a binary solvent diffusion method. The nanoparticle packing structures from specific facets of the supercrystals are characterized by small/wideangle X-ray scattering for detailed reconstruction of nanoparticle translation and shape orientation from mesometric to atomic levels within the supercrystals. We discover that the binary diffusion results in hexagonal close packed supercrystals whose size and quality are determined by initial nanoparticle concentration and diffusion speed. The supercrystal solids display unique facet-dependent surface plasmonic and surface-enhanced Raman characteristics. The ease of the growth of large supercrystal solids facilitates essential correlation between structure and property of nanoparticle solids for practical integrations.

引用

页数：7

共 37 条

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