2D Freestanding Janus Gold Nanocrystal Superlattices

Shi, Q, Gomez, D, Dong, D, Sikdar, D, Fu, R, Liu, Y, Zhao, Y, Smilgies, D and Cheng, W 2019, '2D Freestanding Janus Gold Nanocrystal Superlattices', Advanced Materials, vol. 31, no. 28, pp. 1-6.

Document type: Journal Article
Collection: Journal Articles

Title 2D Freestanding Janus Gold Nanocrystal Superlattices
Author(s) Shi, Q
Gomez, D
Dong, D
Sikdar, D
Fu, R
Liu, Y
Zhao, Y
Smilgies, D
Cheng, W
Year 2019
Journal name Advanced Materials
Volume number 31
Issue number 28
Start page 1
End page 6
Total pages 6
Publisher Wiley - VCH Verlag GmbH & Co. KGaA
Abstract 2D freestanding nanocrystal superlattices represent a new class of advanced metamaterials in that they can integrate mechanical flexibility with novel optical, electrical, plasmonic, and magnetic properties into one multifunctional system. The freestanding 2D superlattices reported to date are typically constructed from symmetrical constituent building blocks, which have identical structural and functional properties on both sides. Here, a general ligand symmetry-breaking strategy is reported to grow 2D Janus gold nanocrystal superlattice sheets with nanocube morphology on one side yet with nanostar on the opposite side. Such asymmetric metallic structures lead to distinct wetting and optical properties as well as surface-enhanced Raman scattering (SERS) effects. In particular, the SERS enhancement of the nanocube side is about 20-fold of that of the nanostar side, likely due to the combined hot spot + lightening-rod effects. This is nearly 700-fold of SERS enhancement as compared with the symmetric nanocube superlattices without Janus structures.
Subject Nanomaterials
Physical Chemistry of Materials
Nanofabrication, Growth and Self Assembly
Keyword(s) freestanding
DOI - identifier 10.1002/adma.201900989
Copyright notice © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 0935-9648
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