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2D freestanding Janus gold nanocrystal superlattices

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Title: 2D freestanding Janus gold nanocrystal superlattices
Authors: Shi, Q
Gomez, DE
Dong, D
Sikdar, D
Fu, R
Liu, Y
Zhao, Y
Smilgies, D-M
Cheng, W
Item Type: Journal Article
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.
Issue Date: 12-Jul-2019
Date of Acceptance: 1-May-2019
URI: http://hdl.handle.net/10044/1/87996
DOI: 10.1002/adma.201900989
ISSN: 0935-9648
Publisher: Wiley
Start Page: 1
End Page: 6
Journal / Book Title: Advanced Materials
Volume: 31
Issue: 28
Copyright Statement: © 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the accepted version of the following article: Shi, Q., Gómez, D. E., Dong, D., Sikdar, D., Fu, R., Liu, Y., Zhao, Y., Smilgies, D.‐M., Cheng, W., 2D Freestanding Janus Gold Nanocrystal Superlattices. Adv. Mater. 2019, 31, 1900989, which has been published in final form at https://doi.org/10.1002/adma.201900989
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
freestanding
Janus
plasmonic
self-assembly
superlattices
ENHANCED RAMAN-SCATTERING
PLASMENE NANOSHEETS
EXCITATION WAVELENGTH
PARTICLES
SUPRAPARTICLES
ARRAYS
Janus
freestanding
plasmonic
self-assembly
superlattices
Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
freestanding
Janus
plasmonic
self-assembly
superlattices
ENHANCED RAMAN-SCATTERING
PLASMENE NANOSHEETS
EXCITATION WAVELENGTH
PARTICLES
SUPRAPARTICLES
ARRAYS
02 Physical Sciences
03 Chemical Sciences
09 Engineering
Nanoscience & Nanotechnology
Publication Status: Published
Article Number: ARTN 1900989
Online Publication Date: 2019-05-09
Appears in Collections:Chemistry