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Self-Assembly of Au@Ag Core-Shell Nanocuboids into Staircase Superstructures by Droplet Evaporation

Abstract

Plasmonic nanomaterials, along with their assemblies, provide numerous applications due to their profound optical properties. In this work, we report self-assembly of Au@Ag core–shell nanocuboids (NCs) into staircase superstructures in both vertical and horizontal orientations through two-stage droplet evaporation. Each stair composes a uniform well-aligned monolayer NCs. The gap distance between NCs can be greatly shrunk to boost corresponding surface-enhanced Raman scattering (SERS) performance using ethanol wash method. The SERS performance of the assembled NCs is calculated by finite-difference time-domain (FDTD) simulation, and studied against step number using 4-mercaptobenzoic acid as Raman reporter molecule. The increasing EF with the increase of layer number proves plasmon mode propagates well in our uniformly aligned assemblies.

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Publication details

The article was received on 04 Aug 2017, accepted on 27 Oct 2017 and first published on 31 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05767A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Self-Assembly of Au@Ag Core-Shell Nanocuboids into Staircase Superstructures by Droplet Evaporation

    X. Yang, J. Li, Y. Zhao, J. Yang, L. Zhou, Z. Dai, X. Guo, S. Mu, Q. Liu, C. Jiang, M. Sun, J. Wang and W. Liang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR05767A

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