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Self-assembly of Au@Ag core–shell nanocuboids into staircase superstructures by droplet evaporation

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Abstract

Plasmonic nanomaterials, along with their assemblies, provide numerous applications due to their profound optical properties. In this work, we report the 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 is composed of a uniform well-aligned monolayer of NCs. The gap distance between NCs can be greatly shrunk to boost the corresponding surface-enhanced Raman scattering (SERS) performance using an ethanol wash method. The SERS performance of the assembled NCs is calculated by finite-difference time-domain (FDTD) simulation, and studied against the step number using 4-mercaptobenzoic acid as a Raman reporter molecule. The increasing EF with the increase of layer number proves that the plasmon mode propagates well in our uniformly aligned assemblies.

Graphical abstract: Self-assembly of Au@Ag core–shell nanocuboids into staircase superstructures by droplet evaporation

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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, 2018, Advance Article
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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, 2018, Advance Article , DOI: 10.1039/C7NR05767A

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