Ellipsometric analysis of porous anodized aluminum oxide films

Jung, Y. W.; Byun, Jeoung-Woo; Woo, Deok Ha; Kim, Y.D.

doi:10.1016/j.tsf.2008.12.051

Cited by 17 publications

(12 citation statements)

References 14 publications

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“…Spectroscopic ellipsometry has been one of the effective, contactless, and nondestructive methods used for the determination of the RI of NAA [187][188][189]. The advantages of ellipsometry mainly stem from the fact that ellipsometry gives a direct measurement of the dielectric response from two experimental parameters (ψ, ∆), without the need of Kramers-Kronig transformation [190]. Moreover, ellipsometry provides high precision Å level resolution even with the multilayer structures.…”

Section: Naa As a Host Materialsmentioning

confidence: 99%

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

et al. 2022

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The fabrication of a thick oxide layer onto an aluminum surface via anodization has been a subject of intense research activity for more than a century, largely due to protective and decorative applications. The capability to create well-defined pores via a cost-effective electrochemical oxidation technique onto the surface has made a major renaissance in the field, as the porous surfaces exhibit remarkably different properties compared to a bulk oxide layer. Amongst the various nanoporous structures being investigated, nanoporous anodic alumina (NAA) with well-organized and highly ordered hexagonal honeycomb-like pores has emerged as the most popular nanomaterial due to its wide range of applications, ranging from corrosion resistance to bacterial repelling surfaces. As compared to conventional nanostructure fabrication, the electrochemical anodization route of NAA with well-controlled pore parameters offers an economical route for fabricating nanoscale materials. The review comprehensively reflects the progress made in the fabrication route of NAA to obtain the material with desired pore properties, with a special emphasis on self-organization and pore growth kinetics. Detailed accounts of the various conditions that can play an important role in pore growth kinetics and pore parameters are presented. Further, recent developments in the field of controlling optical properties of NAA are discussed. A critical outlook on the future trends of the fabrication of NAA and its optical properties on the emerging nanomaterials, sensors, and devices are also outlined.

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Section: Naa As a Host Materialsmentioning

confidence: 99%

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

et al. 2022

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“…Mechanically stable anodized membranes are usually thick , resulting in very high aspect ratios that significantly compromise on efficient mass flow across the membrane, hindering its potential as separation media. The successful anodization of metallic films deposited on Si wafers and even glass has been reported, which increases the versatility of anodized materials since it expands the processing catalog to conventional silicon technologies. The fabrication process reported by Okada et al .…”

Section: Anodizationmentioning

confidence: 99%

Fabrication techniques enabling ultrathin nanostructured membranes for separations

Mireles

Gaborski

2017

Electrophoresis

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The fabrication of nanostructured materials is an area of continuous improvement and innovative techniques that fulfill the demand of many fields of research and development. The continuously decreasing size of the smallest patternable feature has expanded the catalog of methods enabling the fabrication of nanostructured materials. Several of these nanofabrication techniques have sprouted from applications requiring nanoporous membranes such as molecular separations, cell culture, and plasmonics. This review summarizes methods that successfully produce through-pores in ultrathin films exhibiting an approximate pore size to thickness ratio of one, which has been shown to be beneficial due to high permeability and improved separation potential. The material reviewed includes large-area, parallel, and affordable approaches such as self-organizing polymers, nanosphere lithography, anodization, nanoimprint lithography as well as others such as solid phase crystallization and nanosphere lens lithography. The aim of this review is to provide a set of inexpensive fabrication techniques to produce nanostructured materials exhibiting pores ranging from 10 to 350 nm and exhibiting a pore size to thickness ratio close to one. The fabrication methods described in this work have reported the successful manufacture of nanoporous membranes exhibiting the ideal characteristics to improve selectivity and permeability when applied as separation media in ultrafiltration.

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“…For angle dependent reections, one would need to take into account individual polarization components 39 and the anisotropy of the AAO layer. 36,40,41 The reection attenuation from the entire system can be found by calculating the ratio of the electric elds E 0À /E 0+ at the rst surface z 0 ¼ 0, using matching and propagation matrices. 42 Each spectrum contains multiple attenuation maxima (Fig.…”

Section: Spectral Propertiesmentioning

confidence: 99%

Optical properties of thin metal films with nanohole arrays on porous alumina–aluminum structures

et al. 2015

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A multilayer system is formed by deposition of 10-35 nm thin Au or Ag film with 18-25 nm diameter holes on 75-280 nm thick layers of porous anodized aluminum oxide (AAO) supported by a bulk sheet aluminum. We present a detailed study of system parameters, which influence the optical response, including porosity, metal layer thickness and crystallographic orientation of Al substrate. The spectral properties are mainly governed by interference of reflections from the Al substrate and the thin metal film separated by the AAO layer. Enhanced plasmonic attenuation component near 650 nm for Au films with holes can be observed when interferometric anti-reflection condition is fulfilled close to this particular wavelength.

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Ellipsometric analysis of porous anodized aluminum oxide films

Cited by 17 publications

References 14 publications

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

Fabrication techniques enabling ultrathin nanostructured membranes for separations

Optical properties of thin metal films with nanohole arrays on porous alumina–aluminum structures

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