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Multi-layer nanoarrays sandwiched by anodized aluminium oxide membranes: approach to inexpensive, reproducible, highly sensitive SERS substrate

Abstract

A large-scale sub-5 nm nanofabrication technique is developed based on double layer anodized aluminium oxide (AAO) porous membranes masking. This technique also provides a facile way to form multilayer nano-arrays (metal nanoarrays sandwiched by AAO membranes), which is very challenging by other techniques. Normally the AAO mask is to be sacrificed, yet in this work it is preserved as a part of the nanostructure. The preserved AAO layers as the support for second/third layer of metal arrays provide high-refractive index background for the multilayer metal arrays. This background concentrates local E-field more significantly and results in a much higher Surface-Enhanced Raman Spectroscopy (SERS) signal than single layer metal array. This technique may lead to the advent of inexpensive, reproducible, highly sensitive SERS substrate. Moreover,the physical essence of the plasmonic enhancement is unveiled by finite element method based numerical simulations. Enhancements from the gaps and the multilayer nanostructure agree very well with the experiments. Calculated layer-by-layer electric field distribution determines the contribution from different layers and provides more insights into the 3D textured structure.

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Publication details

The article was accepted on 01 Aug 2018 and first published on 07 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR05875J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Multi-layer nanoarrays sandwiched by anodized aluminium oxide membranes: approach to inexpensive, reproducible, highly sensitive SERS substrate

    C. Zhao, Y. Zhu, L. Chen, S. Zhou, Y. Q. Su, X. Ji, A. Chen, X. Gui, Z. Tang and Z. Liu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR05875J

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