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Fabrication of SERS substrates containing dense “hot spots” by assembling star-shaped nanoparticles on superhydrophobic surfaces

Abstract

In this work, efficient SERS substrates containing dense hot spots were fabricated by assembling AuNS@Ag on SMCSL superhydrophobic platforms, based on evaporation assembly technique. The scanning electron microscopy images and Raman images reveals that the star-shaped nanoparticles were closely packed on the SMCSL surfaces, giving rise to high density of hot spots. The as-prepared AuNS@Ag/SMCSL substrates exhibited higher SERS enhancement than AuNPs/SMCSL substrates. Furthermore, the SERS substrates showed low detection limits to Nile blue A (10-12 M) with high analytical enhancement factor of 6×109, and excellent signal reproducibility (RSD ~6.3%). Moreover, the results of simulated electric field distribution also proved higher SERS enhancement of the SERS substrates based on star-shaped particles. Additionally, ultrasensitive detection of OPD, 6-TG, and HGB demonstrated that the AuNS@Ag/SMCSL substrates possess the capability of trace detection for realistic molecule.

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Supplementary files

Publication details

The article was received on 19 Jan 2017, accepted on 01 May 2017 and first published on 02 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00226B
Citation: New J. Chem., 2017, Accepted Manuscript
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    Fabrication of SERS substrates containing dense “hot spots” by assembling star-shaped nanoparticles on superhydrophobic surfaces

    L. Tan, C. Liu, Y. Wang, J. Sun, J. Dong and W. Qian, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00226B

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