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A facile solvent mediated self-assembly silver nanoparticle mirror substrate for quantitatively improved surface enhanced Raman scattering

Abstract

Abstract Herein, a facile solvent mediated silver nanoparticle (AgNP) mirror was introduced as a reproducible and sensitive surface-enhanced Raman scattering (SERS) substrate. The AgNP mirror was fabricated based on commercially available citrate coated AgNP via a facile and unique water-solvent interface assembly method without using any electrical equipment. By dropwise adding 0.2 mg/ml citrate coated AgNP into a mediating solvent, self-assembled AgNP mirrors were formed instantly and gradually setting down in the bottom. The mediating solvent is the key for this fabrication, which should contain a mixture of a non-polar (e.g. hexane, cyclohexane, and iso-octane) and a polar (e.g., acetonitrile, acetone, methanol, and ethanol) organic solvents that have a lower density than water. The fabricated AgNP mirror showed a uniform monolayer arrangement which produced highly reproducible and sensitive signals. The coefficient of variance (i.e., percentage relative standard deviation) for AgNP mirror was 7.3%, as compared to 33.0% for AgNP aggregates). A lower limit of detection (0.008 ppm) and a higher coefficient of determination (0.9981) for the detection of the fonofos pesticide was also obtained from the AgNP mirror as compared to that from the AgNP aggregates. The practical applications of this nanoscale AgNP mirror sensing substrate were also confirmed by its accurate quantification of 0.5 ppm fonofos in apple juice and green tea (i.e., 105.06% and 106.16% recovery value, respectively). Keywords: self-assembly, interface fabrication, SERS, reproducibility, improved quantification, facile fabrication, monolayer, nanoparticles, nanoscale sensor

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Publication details

The article was received on 11 May 2017, accepted on 31 Aug 2017 and first published on 01 Sep 2017


Article type: Paper
DOI: 10.1039/C7AN00784A
Citation: Analyst, 2017, Accepted Manuscript
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    A facile solvent mediated self-assembly silver nanoparticle mirror substrate for quantitatively improved surface enhanced Raman scattering

    Y. Qu, C. Tan, Z. Zhang and L. He, Analyst, 2017, Accepted Manuscript , DOI: 10.1039/C7AN00784A

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