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2015 ; 5
(3
): 417-31
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Aluminum Nanoholes for Optical Biosensing
#MMPMID26184330
Barrios CA
; Canalejas-Tejero V
; Herranz S
; Urraca J
; Moreno-Bondi MC
; Avella-Oliver M
; Maquieira Á
; Puchades R
Biosensors (Basel)
2015[Jul]; 5
(3
): 417-31
PMID26184330
show ga
Sub-wavelength diameter holes in thin metal layers can exhibit remarkable optical
features that make them highly suitable for (bio)sensing applications. Either as
efficient light scattering centers for surface plasmon excitation or metal-clad
optical waveguides, they are able to form strongly localized optical fields that
can effectively interact with biomolecules and/or nanoparticles on the nanoscale.
As the metal of choice, aluminum exhibits good optical and electrical properties,
is easy to manufacture and process and, unlike gold and silver, its low cost
makes it very promising for commercial applications. However, aluminum has been
scarcely used for biosensing purposes due to corrosion and pitting issues. In
this short review, we show our recent achievements on aluminum nanohole platforms
for (bio)sensing. These include a method to circumvent aluminum
degradation--which has been successfully applied to the demonstration of aluminum
nanohole array (NHA) immunosensors based on both, glass and polycarbonate compact
discs supports--the use of aluminum nanoholes operating as optical waveguides for
synthesizing submicron-sized molecularly imprinted polymers by local
photopolymerization, and a technique for fabricating transferable aluminum NHAs
onto flexible pressure-sensitive adhesive tapes, which could facilitate the
development of a wearable technology based on aluminum NHAs.
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