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Rationally designed particle-in-aperture hybrid arrays as large-scale, highly reproducible SERS substrates

Abstract

A large-scale, uniform array of particle-in-aperture (PIA) hybrid architectures for highly reproducible surface-enhanced Raman spectroscopy (SERS) is rationally designed and prepared via electrostatic self-assembly of Au nanospheres and vertical deposition of Ag. By controlling the thickness of the Ag coating, polarization-independent ring-shaped hot spots with tunable width can be created around individual nanospheres, offering far higher Raman enhancements than the bare Au nanosphere array and the flat Ag film do. Three PIA substrates with different Ag thicknesses and an identical nanosphere diameter of 58 nm were investigated. Consequently, it is found that a 28 nm Ag coating enables the wavelength matching between the plasmonic coupling band and the laser line, leading to an enhancement factor of up to 4.5 × 106. Meanwhile, remarkable reproducibility of SERS signals is realized by ruling out the impact of anomalous hot spots. To this end, three guidelines are faithfully followed, that are using monodisperse Au nanospheres, distributing the nanoring cavities evenly onto the substrate, and decoupling adjacent nanoparticles by isolating them far away from each other. This work offers a reliable strategy to fabricate high-performance SERS substrates in a simple, cost-effective and scalable manner, paving the way for practical sensing applications, such as quantitative SERS measurements.

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Publication details

The article was received on 05 Aug 2017, accepted on 12 Oct 2017 and first published on 12 Oct 2017


Article type: Paper
DOI: 10.1039/C7TC03527F
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Rationally designed particle-in-aperture hybrid arrays as large-scale, highly reproducible SERS substrates

    S. Ye, H. Wang, H. Wang, L. Chang, J. Zhang and B. Yang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03527F

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