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. 2019 Mar 13;9(3):426. doi: 10.3390/nano9030426

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Schematic illustrations (A1–A4) and optical images (B1,B2) of self-assembly of Au NP arrays at the liquid interface for SERS platform and microscope images (B3–B5) of self-assembly process of the large-scale interfacial Au NP arrays.