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Nanostructural Engineering of Nanoporous Anodic Alumina for Biosensing Applications

Nano-electronic and Photonic Systems Group, Universitat Rovira i Virgili, Avinguda Països Catalans, 26, Tarragona 43007, Spain
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Materials 2014, 7(7), 5225-5253; https://doi.org/10.3390/ma7075225
Received: 16 April 2014 / Revised: 1 July 2014 / Accepted: 10 July 2014 / Published: 18 July 2014
(This article belongs to the Special Issue Advanced Nanomaterials for Biosensors)
Modifying the diameter of the pores in nanoporous anodic alumina opens new possibilities in the application of this material. In this work, we review the different nanoengineering methods by classifying them into two kinds: in situ and ex situ. Ex situ methods imply the interruption of the anodization process and the addition of intermediate steps, while in situ methods aim at realizing the in-depth pore modulation by continuous changes in the anodization conditions. Ex situ methods permit a greater versatility in the pore geometry, while in situ methods are simpler and adequate for repeated cycles. As an example of ex situ methods, we analyze the effect of changing drastically one of the anodization parameters (anodization voltage, electrolyte composition or concentration). We also introduce in situ methods to obtain distributed Bragg reflectors or rugate filters in nanoporous anodic alumina with cyclic anodization voltage or current. This nanopore engineering permits us to propose new applications in the field of biosensing: using the unique reflectance or photoluminescence properties of the material to obtain photonic barcodes, applying a gold-coated double-layer nanoporous alumina to design a self-referencing protein sensor or giving a proof-of-concept of the refractive index sensing capabilities of nanoporous rugate filters. View Full-Text
Keywords: nanoporous anodic alumina; nanoengineering; pore modulation; RIfS; photonic barcodes; rugate filters; distributed Bragg reflectors; biosensing nanoporous anodic alumina; nanoengineering; pore modulation; RIfS; photonic barcodes; rugate filters; distributed Bragg reflectors; biosensing
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Ferré-Borrull, J.; Pallarès, J.; Macías, G.; Marsal, L.F. Nanostructural Engineering of Nanoporous Anodic Alumina for Biosensing Applications. Materials 2014, 7, 5225-5253.

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