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Tailoring a periodic metal nanoantenna array using low cost template-assisted lithography

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Abstract

Recently, great effort has been invested into nanofabrication approaches that allow fast, reproducible and parallel surface patterning over a large area at the nanoscale. Here, a simple and reproducible approach for the fabrication of a large area highly ordered array of metal nanostructures by nanosphere lithography (NSL) is presented. Based on the self-assembly of close-packed polystyrene (PS) particles, at the air/water interface, this cost-effective approach enables the fabrication of a large-area and transferrable colloidal mask with a high quality crystal-like structure. An interesting tool based on optical diffraction for non-invasive inspection of the monolayer quality to perform in situ monitoring of the colloid packing at the air/water interface before deposition onto solid substrates was developed. Exploiting the interstitial geometry of the colloidal mask, a periodic array of plasmonic nanostructures was easily prepared. Tailoring the optical response of metal nanoparticle assemblies by controlling their morphology to route and manipulate light at the nanoscale is a key topic in the field of nano-optics; to this aim, exploitation of a low-cost nanofabrication technique, allowing a dynamic tunability either in morphology and periodicity arrangement, can be of remarkable added value in a cost-effectiveness evaluation. Here, the versatility of the NSL technique, coupled to a proper annealing post-processing is demonstrated to meet the above needs, allowing parallel surface patterning of large area metal assemblies in a hexagonal periodic configuration and morphology tuning from three dimensional nanoprisms to zero dimensional nanodot profiles. Related optical properties were monitored by UV-vis spectroscopy investigations and compared with proper theoretical analysis and numerical simulation.

Graphical abstract: Tailoring a periodic metal nanoantenna array using low cost template-assisted lithography

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Publication details

The article was received on 08 Jul 2019, accepted on 08 Oct 2019 and first published on 09 Oct 2019


Article type: Paper
DOI: 10.1039/C9TC03701B
J. Mater. Chem. C, 2019, Advance Article

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    Tailoring a periodic metal nanoantenna array using low cost template-assisted lithography

    A. Colombelli, D. Lospinoso, A. Taurino and M. G. Manera, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC03701B

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