Liquid-state quantitative SERS analyzer on self-ordered metal liquid-like plasmonic arrays

Li Tian, Mengke Su, Fanfan Yu, Yue Xu, Xiaoyun Li, Lei Li, Honglin Liu () and Weihong Tan ()
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Li Tian: Hefei University of Technology
Mengke Su: Hefei University of Technology
Fanfan Yu: Hefei University of Technology
Yue Xu: Hefei University of Technology
Xiaoyun Li: Chinese Academy of Sciences
Lei Li: Hefei University of Technology
Honglin Liu: Hefei University of Technology
Weihong Tan: Hunan University

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract Liquid interfacial plasmonic platform is emerging for new sensors, catalysis, and tunable optical devices, but also promises an alternative for practical applications of surface-enhanced Raman spectroscopy (SERS). Here we show that vigorous mixing of chloroform with citrate-capped gold nanorod sols triggers the rapid self-assembly of three-dimensional plasmonic arrays at the chloroform/water (O/W) interface and produces a self-healing metal liquid-like brilliant golden droplet. The O phase itself generates stable SERS fingerprints and is a good homogeneous internal standard for quantitative analysis. This platform presents reversible O/W encasing in a common cuvette determined just by surface wettability of the container. Both O-in-W and W-in-O platforms exhibit excellent SERS sensitivity and reproducibility for different analytes by the use of a portable Raman device. It paves the way toward a practical and quantitative liquid-state SERS analyzer, likened to a simple UV–Vis spectrometer, that is far superior to typical solid substrate-based or nanoparticle sol-based analysis.

Date: 2018
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DOI: 10.1038/s41467-018-05920-z

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