Engineering optical properties of metal/porous anodic alumina films for refractometric sensing

Wang, Lanfang; Qin, Xiufang; Ji, Dengxin; Parry, James P.; Zhang, Jinqiong; Deng, Chenhua; Ding, Guqiao; Gan, Qiaoqiang; Zeng, Hao; Xu, Xin

doi:10.1016/j.apsusc.2015.07.087

Cited by 14 publications

(10 citation statements)

References 42 publications

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“…The reflectance was found to depend on the thickness of AAO films and, significantly, on the interpore distance . Moreover, a strong dependence of the reflectance on the anodization electrolyte was found in the UV region, leading to the observation that the chemical composition plays an important role. , For metal-AAO–Al nanostructures, it is well established that the colors are tuned by the thickness of AAO films. ,,,, Moreover, some studies have reported that the color is tuned by the pore diameter , or porosity; ,, however, some controversy still exists due to the fact that in these studies the pore diameter and the porosity are changing at the same time since a chemical etching is performed to modify the pore diameter. To date, the complete influence of AAO films’ morphological parameters on color has not been determined.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Color and Effective Refractive Index of Metal-Anodic Aluminum Oxide (AAO)–Al Nanostructures: Morphology of AAO

et al. 2017

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Metal-anodic aluminum oxide (AAO)–Al nanostructures have been deposited by using sputtering for the metal layer deposition and a two-step anodization process in different electrolytes to produce self-ordered anodic aluminum oxide films. The effect of the morphological parameters of AAO films (such as thickness, pore diameter, interpore distance, and porosity) on the optical properties was studied. The UV–vis reflectance properties as a function of the thickness for the different electrolytes of metal-AAO–Al films were analyzed in order to obtain the color diagrams and the effective refractive indexes of the films. The effective refractive index was found to depend on the thickness and porosity of AAO films. The change in color observed in metal-AAO–Al nanostructures is due to the thickness and porosity of the AAO films. In order to verify the experimental results, UV–vis reflectance spectra of AAO–Al films were simulated using commercially available finite element simulation software.

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Section: Introductionmentioning

confidence: 99%

Controlling the Color and Effective Refractive Index of Metal-Anodic Aluminum Oxide (AAO)–Al Nanostructures: Morphology of AAO

et al. 2017

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“…At the end of the 1990s, the self-ordering behavior of porous alumina was reported via anodizing under optimal electrochemical conditions, including the anodizing voltage, temperature, and solution concentration, due to the rearrangement of the porous alumina during long-term anodizing [5][6][7][8]. High-aspect-ratio and highly ordered porous alumina with an ideal honeycomb structure can be easily fabricated via self-ordered anodizing and has been widely used by many researchers as a template and membrane for various nanotechnologies [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing

Akiya

Kikuchi

Natsui

et al. 2016

Electrochimica Acta

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Self-ordered periodic porous alumina with an undiscovered cell diameter was fabricated via electrochemical anodizing in a new electrolyte, phosphonic acid (H 3 PO 3 ). High-purity aluminum plates were anodized in phosphonic acid solution under various operating conditions of voltage, temperature, concentration, and anodizing time. Phosphonic acid anodizing at 150-180 V caused the self-ordering behavior of porous alumina, and an ideal honeycomb nanostructure measuring 370-440 nm in cell diameter was successfully fabricated on the aluminum substrate. Conversely, disordered porous alumina grew at below 140 V, and anodizing at above 190 V caused local thickening due to oxide burning. Two-step phosphonic acid anodizing allows the fabrication of high aspect ratio ordered porous alumina. HPO 3 2-anions originated from the electrolyte were incorporated into the porous oxide during anodizing. Consequently, a double-layered porous alumina consisting of a thick outer layer containing incorporated HPO 3 2-anions, and a thin inner layer without anions was constructed via phosphonic acid anodizing.

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“…Examples of devices for applications are chemical sensors, biosensors, optical waveguide sensors, distributed-Bragg reflectors or rugate filters, etc. [1][2][3]. The porous anodic alumina (PAA) is formed when aluminum (Al) samples are electrochemically anodized in an acidic medium under specified anodization conditions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…There is an increasing attention towards optical characterization of different kinds of PAA [1][2][3][4]. The optical reflectance of the thin film is dependent on its refractive index, porosity, and the film thickness.…”

Section: Introductionmentioning

confidence: 99%

Optical reflectance from anodized Al-0.5 wt % Cu thin films: Porosity and refractive index calculations

Abd‐Elnaiem

Asafa

Trivinho‐Strixino

et al. 2017

Journal of Alloys and Compounds

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Porous anodic alumina (PAA) films with periodically arranged horizontal and vertical nanopores have been applied as templates or platforms upon which optical sensors can be based.While the porosity and the refractive index of these 3D PAA can be tuned by varying the anodization parameters, estimating them from reflectance data has not been explored. In this study, we estimated the porosity and refractive index of thin anodized Al-0.5 wt% Cu from the alumina film thickness and the interference pattern composed of the incident and reflected light beam in the alumina film. The 3D PAA films were prepared by anodization of Al-0.5 wt% Cu thin film deposited on TiN/Si substrate. Anodization was performed in three electrolytes at different concentrations (1 M sulfuric acid, 0.3 M oxalic acid and 0.75 M phosphoric acid) within the voltage range of 10-90 V. The structural characteristics showed that both pore size and inter-pore distance increased with increased anodization voltage and time while the pore density decreases exponentially. The results from reflectance spectra clearly showed that the effective refractive index of the samples decreased with voltage and anodization time, while porosity (total, vertical and horizontal) increased. Also, the density of PAA samples is estimated and shows an inverse proportionality with the porosity.

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Engineering optical properties of metal/porous anodic alumina films for refractometric sensing

Cited by 14 publications

References 42 publications

Controlling the Color and Effective Refractive Index of Metal-Anodic Aluminum Oxide (AAO)–Al Nanostructures: Morphology of AAO

Controlling the Color and Effective Refractive Index of Metal-Anodic Aluminum Oxide (AAO)–Al Nanostructures: Morphology of AAO

Self-ordered Porous Alumina Fabricated via Phosphonic Acid Anodizing

Optical reflectance from anodized Al-0.5 wt % Cu thin films: Porosity and refractive index calculations

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