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Chemosensors 2019, 7(1), 13; https://doi.org/10.3390/chemosensors7010013

Long- and Short-Range Ordered Gold Nanoholes as Large-Area Optical Transducers in Sensing Applications

1
Institute for Microelectronics and Microsystems IMM-CNR, Campus Ecotekne, 73100 Lecce, Italy
2
Deparmento of Mathematics and Physics “Ennio De Giorgi”, University of Salento, via Arnesano, 73100 Lecce, Italy
*
Authors to whom correspondence should be addressed.
Received: 14 February 2019 / Revised: 9 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Hierarchical Nanostructures for Gas Sensors)
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Abstract

Unconventional lithography (such as nanosphere lithography (NSL) and colloidal lithography (CL)) is an attractive alternative to sequential and very expensive conventional lithography for the low-cost fabrication of large-area nano-optical devices. Among these, nanohole (NH) arrays are widely studied in nanoplasmonics as transducers for sensing applications. In this work, both NSL and CL are implemented to fabricate two-dimensional distributions of gold NHs. In the case of NSL, highly ordered arrays of gold NHs distributed in a hexagonal lattice onto glass substrates were fabricated by a simple and reproducible approach based on the self-assembling of close-packed 500 nm diameter polystyrene particles at an air/water interface. After the transfer onto a solid substrate, the colloidal masks were processed to reduce the colloidal size in a controllable way. In parallel, CL was implemented with short-range ordered gold NH arrays onto glass substrates that were fabricated by electrostatically-driven self-assembly of negatively charged colloids onto a polydiallyldimethylammonium (PDDA) monolayer. These distributions were optimized as a function of the colloidal adsorption time. For both approaches, controllable and reproducible procedures are presented and discussed. The optical responses of the NH structures are related to the short-range ordering level, and their good performances as refractive index transducers are demonstrated. View Full-Text
Keywords: unconventional lithography; ordered nanoholes; short-range ordered nanoholes; spectral response; nanoplasmonics; refractometric sensing unconventional lithography; ordered nanoholes; short-range ordered nanoholes; spectral response; nanoplasmonics; refractometric sensing
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Cesaria, M.; Colombelli, A.; Lospinoso, D.; Taurino, A.; Melissano, E.; Rella, R.; Manera, M.G. Long- and Short-Range Ordered Gold Nanoholes as Large-Area Optical Transducers in Sensing Applications. Chemosensors 2019, 7, 13.

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