Nanoporous Anodic Alumina Barcodes: Toward Smart Optical Biosensors

Santos, Abel; Balderrama, Víctor S.; Alba, María; Formentı́n, Pilar; Ferré‐Borrull, Josep; Pallarès, Josep; Marsal, Lluís F.

doi:10.1002/adma.201104490

Cited by 109 publications

(117 citation statements)

References 33 publications

Supporting

Mentioning

115

Contrasting

Order By: Relevance

“…[22][23][24][25][26][27][28] Recently, some of these approaches have been used to produce numerous NAA-based photonic structures, including rugate filters, optical microcavities, FabryPerót interferometers and distributed Bragg reflectors. [29][30][31][32][33][34][35][36][37][38][39] The development of optical platforms based on NAA has spread the use of this nanomaterial, typically used as a nanoporous template to grow other nanostructures such as nanowires and nanotubes 15 , towards more relevant applications such as optical sensing systems, drug delivery chips and photonic tags. [40][41][42][43][44][45][46][47][48][49][50][51] In this study, we present an innovative and rationally designed pulse anodisation approach, so called pseudo-stepwise pulse anodisation (PSPA), which enables the fabrication of nanoporous anodic alumina optical bandpass filters (NAABPFs) with advanced optical properties (Fig.…”

Section: Introductionmentioning

confidence: 99%

Rational engineering of nanoporous anodic alumina optical bandpass filters

et al. 2016

Self Cite

View full text Add to dashboard Cite

Herein, we present a rationally designed advanced nanofabrication approach aiming at producing a new type of optical bandpass filters based on nanoporous anodic alumina photonic crystals. The photonic stop band of nanoporous anodic alumina (NAA) is engineered in depth by means of a pseudo-stepwise pulse anodisation (PSPA) approach consisting in pseudostepwise asymmetric current density pulses. This nanofabrication method makes it possible to tune the transmission bands of NAA at specific wavelengths and bandwidths, which can be broadly modified across the UV-visible-NIR spectrum through the anodisation period (i.e. time between consecutive pulses). First, we establish the effect of the anodisation period as a means of tuning the position and width of the transmission bands of NAA across the UV -visible-NIR spectrum. To this end, a set of nanoporous anodic alumina bandpass filters (NAA-BPFs) are produced with different anodisation periods, ranging from 500 to 1200 s, and their optical properties (i.e. characteristic transmission bands and interferometric colours) are systematically assessed. Then, we demonstrate that the rational combination of stacked NAABPFs consisting of layers of NAA produced with different PSPA periods can be readily used to create a set of unique and highly selective optical bandpass filters with characteristic transmission bands, the position, width and number of which can be precisely engineered by this rational anodisation approach. Finally, as a proof-of-concept, we demonstrate that the superposition of stacked NAA-BPFs produced with slight modifications of the anodisation period enables the fabrication of NAA-BPFs with unprecedented broad transmission bands across the UV-visible-NIR spectrum. The results obtained from our study constitute the first comprehensive rationale towards advanced NAA-BPFs with fully controllable photonic properties. These photonic crystal structures could become a promising alternative to traditional optical bandpass filters based on glass and plastic.

show abstract

Section: Introductionmentioning

confidence: 99%

Rational engineering of nanoporous anodic alumina optical bandpass filters

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…As discussed above, the number, intensity and position of the PL oscillations depend on the thickness (L AAO ), pore diameter (D p ), and the nature of effective medium. By exploiting these features, the authors demonstrated that their barcode system can be used as optical biosensors for solvochromic oxazine molecules and glucose [123].…”

Section: Pore Wideningmentioning

confidence: 98%

“…Santos and coworkers [123,124] put forward the Fabry-Pérot effect to develop an optical encoding system based on the PL spectra of porous AAOs in the UV-Visible range (Fig. 4.9).…”

Section: Pore Wideningmentioning

confidence: 99%

Structural Engineering of Porous Anodic Aluminum Oxide (AAO) and Applications

Lee

2015

Nanoporous Alumina

View full text Add to dashboard Cite

Porous anodic aluminum oxide (AAO) films can be conveniently produced by anodization of aluminum. Porous oxide layer formed on aluminum contains a large number of mutually parallel pores. Each cylindrical nanopore and its surrounding oxide constitute a hexagonal cell aligned normal to the metal surface. Under proper conditions, the oxide cells are self-organized to form a hexagonally close-packed structure. The novel and tunable structural features of porous AAOs have been intensively exploited for templated synthesis of a variety of functional nanostructures and also for fabrication of nanodevices. On the other hand, porous AAOs with modulated pores may provide an additional degree of freedom in templated synthesis. In addition, they can be used as model systems for systematically investigating structure-property relations of nanostructured materials. Based on the anodization techniques developed recently, one can fabricate porous AAOs with tailor-made internal pore structures. This chapter is devoted to conveying the most recent advances in structural engineering of porous AAOs and nanotechnology applications. In order to provide context, a brief description is given of the general structure and fundamental electrochemical processes associated with pore formation. Subsequently, two common anodizing techniques (i.e., mild and hard anodizations) that have been explored for nanotechnology applications are discussed. Next, various nanostructuring approaches for custom-designed porous AAOs are reviewed. The chapter covers the properties of porous AAOs derived from structural engineering and their applications to various nanotechnology researches and finally presents the challenges and future prospects.

show abstract

“…This happens because of two main factors: (i) its porous structure is adequate for integrating the necessary fluidic circuits with the optical setup and (ii) its great surface-to-volume ratio permits a great amplification factor of the changes in the surface, even for small amounts of the species to be detected. Nevertheless, optical properties of p-AAO are also the basis of other applications not directly related to sensing, as for instance the extraction of light from LEDs [79,96] (where the p-AAO nanostructure serves as a texturizing template for the LED surface), the generation of laser emission [76] (where the self-arrangement of pores contributes to create cavity modes to amplify laser light emitted by a gain material infiltrated within the pores), to texturize surfaces and interfaces of photovoltaic cells to improve light absorption or charge collection in the energy conversion process [97], or even to create unique photonic barcodes for labeling applications [98]. Doing an extensive review of all the applications based on the optical properties would require a much longer extent than this chapter.…”

Section: Photonic Properties: Interaction Of Light With P-aao Nanostrmentioning

confidence: 99%

Optical Properties of Nanoporous Anodic Alumina and Derived Applications

et al. 2015

Self Cite

View full text Add to dashboard Cite

Inexpensive formation of periodically ordered structures with periodicities and feature sizes lower than 100 nm has triggered a vast amount or research in recent years. Of particular interest in nanotechnology is the nanoporous alumina, which can be produced with a self-organized arrangement of pores in the adequate anodization conditions. Most of the interest of this material is based in its outstanding physical and chemical and properties, and more specifically in its optical properties. The interaction of light with the nanostructured porous alumina gives rise to a wealth of optical properties that have their interest both in research level and also in application. In this work we aim at giving an extensive review of the published research on the optical properties of nanoporous alumina. The review will account for the different studied optical properties of this material such as the existence of a photonic stop band originated from its quasi-random nanostructure, the interferometric and light guiding properties that can be applied to biosensing, the structure nanoengineering to achieve more complex photonic behaviour such as distributed-Bragg reflectors or rugate filters, and the photoluminescence properties. In a second part, a summary of the different applications proposed on the basis of these properties, such as in biotechnology or energy will be given. IntroductionAmong the different features and properties of porous anodic alumina (p-AAO), its optical properties are of special interest and have been the subject of very intensive research. The interaction of light with p-AAO can be analyzed from different points of view: the material interaction, the porous structure interaction or the relation of geometrical features of the nanostructure (periodicity or quasi-periodicity, distance

show abstract

Nanoporous Anodic Alumina Barcodes: Toward Smart Optical Biosensors

Cited by 109 publications

References 33 publications

Rational engineering of nanoporous anodic alumina optical bandpass filters

Rational engineering of nanoporous anodic alumina optical bandpass filters

Structural Engineering of Porous Anodic Aluminum Oxide (AAO) and Applications

Optical Properties of Nanoporous Anodic Alumina and Derived Applications

Contact Info

Product

Resources

About