Relevant bibliographies by topics / Porous anodic aluminium oxide

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Academic literature on the topic 'Porous anodic aluminium oxide'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Porous anodic aluminium oxide"

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Voon, Chun Hong, Mohd Nazree Derman, U. Hashim, Bee Ying Lim, and Sung Ting Sam. "Oxide Dissolution Treatment of Porous Anodic Alumina." Advanced Materials Research 1109 (June 2015): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.73.

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In this study, oxide dissolution treatment was used for the formation of well ordered porous anodic alumina. Porous anodic alumina was formed on mechanically polished high purity aluminium by anodizing at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. It is observed that the pore arrangement of as anodized porous anodic alumina was randomly distributed and showed no ordered hexagonal cell structure. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope. Pore arrangement of porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar to one another where no ordered periodic structures were formed. .When porous anodic alumina subjected to oxide dissolution treatment for three minutes, a perfect hexagonal pore arrangement was obtained.
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Voon, Chun Hong, Mohd Nazree Derman, Kai Loong Foo, M. Nuzaihan, and Uda Hashim. "Fast Fourier Transform Analysis of Images of Scanning Electron Microscope of Porous Anodic Alumina." Advanced Materials Research 1109 (June 2015): 69–72. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.69.

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In this study, Fast Fourier Transform (FFT) analysis was conducted on the images of scanning electron microscope of morphology of the porous anodic alumina formed on high purity aluminium. High purity aluminium substrates were anodized at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope and the images were analyzed using FFT. It was found that the FFT images of as anodized porous anodic alumina and porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar, which were disc shaped white forms, indicating no ordered periodic structures were formed. When porous anodic alumina subjected to oxide dissolution treatment for three minutes, FFT image showed six distinct spots at the edges of a hexagon, indicating a perfect hexagonal pore arrangement was obtained for porous anodic alumina subjected to oxide dissolution treatment for three minutes.
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Rozhdestvenska, Liudmyla, Kateryna Kudelko, Volodymyr Ogenko, and Menglei Chang. "MEMBRANE MATERIALS BASED ON POROUS ANODIC ALUMINIUM OXIDE." Ukrainian Chemistry Journal 86, no. 12 (January 15, 2021): 67–102. http://dx.doi.org/10.33609/2708-129x.86.12.2020.67-102.

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Anodized aluminum oxide (AOA) is applied in many technological areas such as formation of decorative or anticorrosive coating, hydrophobic and hydrophilic surfaces, development of functional micro- and nanomaterials. Due to unique properties of porous structure (most direct, regular and through pores with size in a narrow range) AOA films can be used for membrane separation. The morphological features of such films mainly depend on synthesis conditions. This review consists of the models of pore formation on the aluminum surface and the correlation parameters of films with anodizing conditions. Particular attention is paid to the influence of synthesis factors (electrolyte composition, voltage, temperature conditions, etc) on the porous structure of AOA and the film thickness that determines the mechanical strength of membranes. The optimal voltage values for the porous structure arraingment of anodized aluminum oxide were indicated for each electrolyte. It is noted formation of cylindrical shaped pores with controllable pore diameters, periodicity and density distribution can be produced during two-stage anodizing. The pre-treatment of the metal surface and stage of separation of the formed film from its surface are also considered. Modern research are mainly aimed to synthesis of porous AOA membranes in new anodizing electrolytes and determining pore formation factors on the aluminum surface. The new anodizing conditions in most popular electrolytes (oxalic, sulfuric, phosphoric acids) for obtaining of porous AOA with the required morphological features is also under investigation. Such conditions include, for example, a lower voltage or higher temperature in case for a particular electrolyte. To avoid of local heating the electrolytes with additional components, for example, organic additives is also studied. Some practical aspects of AOA membrane utilization obtained under certain conditions are considered.
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Wada, K., T. Shimohira, M. Yamada, and N. Baba. "Microstructure of porous anodic oxide films on aluminium." Journal of Materials Science 21, no. 11 (November 1986): 3810–16. http://dx.doi.org/10.1007/bf02431615.

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Hu, Naiping, Xuecheng Dong, Xueying He, Sandip Argekar, Yan Zhang, James F. Browning, and Dale W. Schaefer. "Interfacial morphology of low-voltage anodic aluminium oxide." Journal of Applied Crystallography 46, no. 5 (August 24, 2013): 1386–96. http://dx.doi.org/10.1107/s0021889813018219.

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X-ray reflectivity (XRR) and neutron reflectivity (NR), as well as ultra-small-angle X-ray scattering (USAXS), are used to examine the in-plane and surface-normal structure of anodic films formed on aluminium alloy AA2024 and pure aluminium. Aluminium and alloy films up to 3500 Å thick were deposited on Si wafers by electron beam evaporation of ingots. Porous anodic aluminium oxide (AAO) films are formed by polarizing at constant voltage up to 20 V noble to the open circuit potential. The voltage sweet spot (5 V) appropriate for constant-voltage anodization of such thin films was determined for both alloy and pure Al. In addition, a new concurrent voltage- and current-control protocol was developed to prepare films with larger pores (voltages higher than 5 V), but formed at a controlled current so that pore growth is slow enough to avoid stripping the aluminium substrate layer. USAXS shows that the pore size and interpore spacing are fixed in the first 10 s after initiation of anodization. Pores then grow linearly in time, at constant radius and interpore spacing. Using a combination of XRR and NR, the film density and degree of hydration of the films were determined from the ratio of scattering length densities. Assuming a chemical formula Al2O3·xH2O, it was found thatxvaries from 0.29 for the native oxide to 1.29 for AAO grown at 20 V under concurrent voltage and current control. The average AAO film density of the porous film at the air surface is 2.45 (20) g cm−3. The density of the `barrier' layer at the metal interface is 2.9 (4) g cm−3, which indicates that this layer is also quite porous.
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Cheng, Tsung-Chieh, and Chu-Chiang Chou. "The Electrical and Mechanical Properties of Porous Anodic 6061-T6 Aluminum Alloy Oxide Film." Journal of Nanomaterials 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/371405.

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The properties of the growth of the 6061-T6 aluminum alloy oxide were studied using sulfuric acid anodization. The parameters for the manufacturing process include electrolyte categories, electrolyte concentration, and operating voltages. The results showed that the aluminum oxides obtained by anodization process are mainly amorphous structure and the anodic current density is an important factor affecting the rate of response for oxygen and aluminum ions in barrier. In this experiment, polish process is very important to stable the anodic aluminum oxide film and then it will get the better properties of anodic film. Besides, when using sulfuric acid as the electrolyte, the increase of anodic voltage also increases the rate of reaction which increases the mechanical and electrical properties of anodic oxide film, but too large applied anodic voltage will reduce the mechanical and electrical properties of film because of the crack of the anodic oxide film.
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Li, Yi, Yuyan Qin, Zhiyuan Ling, Xing Hu, and Yanhua Shen. "Unique AAO films with adjustable hierarchical microstructures." RSC Advances 5, no. 1 (2015): 136–39. http://dx.doi.org/10.1039/c4ra13076f.

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Boytsova, Olga, Alexey Klimenko, Vasiliy Lebedev, Alexey Lukashin, and Andrey Eliseev. "Nanomechanical humidity detection through porous alumina cantilevers." Beilstein Journal of Nanotechnology 6 (June 16, 2015): 1332–37. http://dx.doi.org/10.3762/bjnano.6.137.

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We present here the behavior of the resonance frequency of porous anodic alumina cantilever arrays during water vapor adsorption and emphasize their possible use in the micromechanical sensing of humidity levels at least in the range of 10–22%. The sensitivity of porous anodic aluminium oxide cantilevers (Δf/Δm) and the humidity sensitivity equal about 56 Hz/pg and about 100 Hz/%, respectively. The approach presented here for the design of anodic alumina cantilever arrays by the combination of anodic oxidation and photolithography enables easy control over porosity, surface area, geometric and mechanical characteristics of the cantilever arrays for micromechanical sensing.
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Xamidov, Anvar, Farhodjon Hoshimov, Shavkat Mamatkulov, Khakimjan Butanov, Mirakhmat Yunusov, and Olim Ruzimuradov. "Catalytic Activity of Ni, Co, Mo Supported Anodic Aluminum Oxide Nanocomposites." Bulletin of Chemical Reaction Engineering & Catalysis 15, no. 3 (November 10, 2020): 845–52. http://dx.doi.org/10.9767/bcrec.15.3.8480.845-852.

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Nanostructured catalysts based on porous aluminum oxide (PAO) and some 3d metals, such as: nickel, cobalt, and molybdenum, have been obtained by anodic oxidation and impregnation. The synthesis of porous aluminum oxide with a highly ordered pore structure with pore sizes of 50 nm and a thickness of 50 µm is carried out by the method of two-stage anodic oxidation. The catalysts are obtained by impregnation of 3d metals into nanosized pores of aluminum oxide. The obtained catalysts based on nickel and porous Al2O3 are studied by scanning electron microscopy (SEM-EDX). The results of SEM-EDX analysis shows that a spongy structure with filament sizes of 100 nanometers containing particles of 3d metals formed on the surface of the aluminum oxide matrix. The results are presented on the activity of nickel and heterogenic cobalt and molybdenum nanoparticles in the reaction of hydrogenation of hexene to hexane. The results show that the yield temperature of the hexane is decreased and the yield of hexane is observed at 200 °C with Ni/Al2O3 catalysts, and a similar yield of hexane mass is achieved at temperatures higher than 250 °C with Co-Mo/Al2O3 and traditional nickel catalysts on kieselguhr. Copyright © 2020 BCREC Group. All rights reserved
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Juyana, A. Wahab, and Mohd Nazree Derman. "Characterization of Porous Anodic Aluminium Oxide Film on Aluminium Templates Formed in Anodizing Process." Advanced Materials Research 173 (December 2010): 55–60. http://dx.doi.org/10.4028/www.scientific.net/amr.173.55.

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A porous anodic aluminium oxide (AAO) films were successfully fabricated on aluminium templates by using anodizing technique. The anodizing process was done in the mixed acid solution of phosphoric acid and acetic acid. The growth, morphology and chemical composition of AAO film were investigated. During the anodizing process, the growth of the oxide pores was strictly influenced by the anodizing parameters. The anodizing was done by varying the voltage at 70 V to 130 V and temperature from 5 °C to 25 °C. The electrolyte concentration was remaining constant. In this study, all the samples were characterized using scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques. From this study, the optimum parameters to obtain porous AAO film with the mixture of phosphoric acid and acetic acid solution can be known.
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Dissertations / Theses on the topic "Porous anodic aluminium oxide"

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Oh, Jihun. "Porous anodic aluminum oxide scaffolds; formation mechanisms and applications." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59709.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Nanoporous anodic aluminium oxide (AAO) can be created with pores that self-assemble into ordered configurations. Nanostructured metal oxides have proven to be very useful as scaffolds for growth of nanowires and nanotubes with tunable diameters and with tight diameter distributions. For 50 years, field-assisted dissolution of the oxide has been cited as the mechanism that leads to pore formation in alumina, and by analogy, porous anodic TiO₂ and other functional metal oxides. We show that field-assisted dissolution models are consistent with the observed dependence of the Al₂O₃ dissolution rate on the electric field, as well as the existence of a critical field for pore initiation. However, we further show that the well-known ordered porous structure, which has a significantly different length scale, does not result from a field-induced instability, but is instead the result of a strain-induced instability with forced plastic deformation and flow of the oxide during further anodization. We demonstrate that these pore generation mechanisms can be controlled independently, even when they co-exist, by controlling the electric field across the oxide as well as the anodization conditions. We also show that mechanical confinement results in a dendritic pore structure. Through interpretation of these results we develop a generalized mechanism for ordered pore formation in AAO in analogy with cellular solidification. In addition, we report on abnormal behavior in anodic oxidation of Al in mechanically confined structures for formation of horizontal nanoporous anodic alumina oxide, H-AAO. Instead of smooth pore walls, periodic dendrite inner pore structures form, the growth rate is suppressed to 5 % of its value during bulk anodization under the same conditions, and a steady-state is never reached. These anomalies associated with formation of H-AAO originate from suppressed volume expansion and plastic flow of Al₂O₃ confined by the SiO₂ hard mask. By determining new anodization conditions leading to zero volume expansion, dendritic H-AAO can be avoided and kinetic retardation can be minimized. A new method for perforation of the AAO barrier layer has been developed, based on anodization of Al/W bilayer films on substrates. When Al/W bilayer films are anodized and pores approach the Al/W interface, tungsten oxide forms and penetrates the alumina barrier oxide, in part, due to enhanced plasticity of the alumina layer. By selectively etching the tungsten oxide, the barrier oxide can be removed and the base of the pores opened, without etching of the AAO. Finally, we further refined the selective barrier perforation process using the W interlayer to develop a methodology for fabrication of through-pore AAO scaffolds on any conducting substrate (AS) by anodizing an Al/W/AS tri-layer. Structural and kinetic study of the WO₃ extrusion revealed that the anodization of W consumes a fixed thickness of the W layer in acidic electrolytes under specific anodization conditions. Based on this study, the optimum thickness of the W interlayer in the Al/W/Au tri-layer was measured for various anodization conditions. Through-pore AAOs were fabricated on Au layers with exposure of the surface at the base of the pores, using the optimum W thickness without a violent O₂ evolution reaction and without changing the pore diameters. With scaffolds made using this methodology, vertically-aligned free-standing Au and Pt nanowires with diameters ranging from about 12 nm to about 120 nm were grown by electrodeposition on a gold substrate.
by Jihun Oh.
Ph.D.
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He, Xueying. "Characterization of Porous Anodic Aluminum Oxide Film by Combined Scattering Techniques." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1383645061.

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Lim, Jin-Hee. "Synthesis and Characterization of Nanostructures in Porous Anodic Aluminum Oxide Templates." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/455.

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In this study, template-based methods are used for the fabrication of various nanostructures such as nandots, nanorods, nanowires, nanotubes, and core-shell structures. Porous alumina membranes were employed as templates and metal nanostructures were synthesized in the templates by electrodeposition. By using lithography techniques, controlled patterned nanostructures were also fabricated on alumina templates. The magnetic properties of the various metal nanostructures were investigated. The pore size, interpore distance, and pore geometry highly affect magnetic properties of nanostructures grown in the templates. Hexagonally ordered porous alumina templates can be fabricated by two-step anodization. The pore diameters and interpore distances were readily controlled by appropriately changing anodization conditions and pore widening time. Alumina templates with various pore geometries were also successfully synthesized by changing applied voltage, increasing and decreasing, during a third anodization step. To understand magnetic properties of nanostructures with different aspect rations in the form of nanodots, nanorods, or nanowires, Fe nanostructures were fabricated in the templates by controlling of electrodeposition times. The coercivity of nanostructures increased with increasing aspect ratio. The anisotropy of the arrays was governed by the shape anisotropy of the magnetic objects with different aspect ratios. nanowires in mild-hard alumina and conventional alumina templates showed distinct differences in the squareness of hysteresis loops and coercivity both as a function of pore structure and magnetic component. Iron oxide nanotubes with a unique inner-surface were also fabricated by an electrodeposition method. β-FeOOH nanotubes were grown in alumina templates and transformed into hematite and magnetite structures during various heating processes. Hematite nanotubes are composed of small nanoparticles less than 20 nm diameters and the hysteresis loops and FC-ZFC curves show superparamagnetic properties without the Morin transition. In the case of magnetite nanotubes, which consist of slightly larger nanoparticles, hysteresis loops show ferromagnetism with weak coercivity at room temperature while FC-ZFC curves exhibit the Verwey transition at 125 K. For the patterning of nanowires, lithography techniques including nanosphere lithography and e-beam lithography were used. Nanosphere lithography used self-assembled PS spheres as a mask creates holes between spheres and the size of the holes is determined by the size and geometry of ordered PS spheres on the templates. This method can grow patterned nanowires arrays and also produce unique cup-shaped nanostructures with sizes ranging from micrometer down to several nanometers. E-beam lithography was also combined with template-based electrodeposition. Of these two lithographic methods, this one is the most powerful in the fabrication of patterned nanostructures with high aspect ratios. Various features and the sizes of patterned structures can be readily controlled. By the directing the pore diameters and interpore distances of the alumina template, the size and number of patterned nanowires are also adjustable.
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Chennell, Philip. "Préparation et caractérisation de surfaces poreuses ordonnées en polymères en vue d'applications médicales." Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAS005/document.

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Les stents urétéraux et les sondes de néphrostomie sont constitués de silicone ou de polyuréthane thermoplastique (TPU). Afin de limiter les risques infectieux lors de leur implantation, une modification topographique par création de pores permettrait de limiter l’adhésion des bactéries et de former des réservoirs pour une libération in situ de substances antiinfectieuses. Ce travail vise à préparer des surfaces en polymère ayant un motif poreux tubulaire ordonné. Une réplication en deux temps à partir de surfaces ordonnées poreuses d’oxyde d’aluminium (PAAO) préparées par 2 méthodes (double anodisation douce et double anodisation dure/douce) a été mise en œuvre pour reproduire le motif initial sur des surfaces en silicone et TPU. Pour le moule intermédiaire trois matériaux ont été testés (acrylonitrile butadiène styrène, polystyrène et résine polyacrylate). Les surfaces ont toutes été caractérisées par des techniques microscopiques et spectroscopiques. Les surfaces en PAAO préparées par double anodisation douce possédaient des pores d’environ 50 nm de diamètre et 100 nm de profondeur, alors que celles obtenues après mise au point de la méthode dure/douce étaient de taille supérieure, d’environ 125 nm de diamètre et ayant des profondeurs de quelques centaines de nanomètres. La surface du moule intermédiaire est constituée de picots. Une adhésion latérale de ceux-ci a été observée pour certaines conditions. La meilleure réplication du motif a été obtenue pour le TPU. Les surfaces ainsi obtenues pourront être utilisées et optimisées lors de l'étude ultérieure de l'adhésion du biofilm
Ureteral stents and nephrostomy catheters are made of silicone or thermoplastic polyurethane (TPU). A topographical modification creating an ordered porous surface could limit the infectious risks during their implantation, by reducing bacterial adhesion and creating a loading platform from which anti-infectious compounds could be released.In this work, a two-steps replication method was used to create ordered porous polymer surfaces (silicone or TPU) using porous anodic aluminium oxide (PAAO) as master template. The PAAO surfaces were prepared by double mild or double hard/mild anodization. Three intermediate mould materials were tested (acrylonitrile butadiene styrene, polystyrene, polyacrylate resin). The polymer material (silicone or TPU) was then moulded onto the intermediate mould surfaces that possessed freestanding pillar arrays, to imprint pores. The obtained surfaces were characterized by microscopic and spectroscopic methods. The initial PAAO surfaces prepared by double mild anodization possessed pores of about 50 nm diameter and 100 nm depth, whereas those prepared after development of the double hard/mild anodization method were bigger, of about 125 nm diameter and several hundred nanometers deep. The intermediate mould structure possessed freestanding arrays, but instabilities (lateral adhesion) were noted for certain conditions. The best pattern replication was observed for TPU. In conclusion, these novel porous polymeric surfaces could be optimized and tested for an anti-biofilm effect
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King, L. J. "Aligned nanorods of A1PO4-5 within the pores of anodic alumina : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Master of Science with Honours in Chemistry /." ResearchArchive@Victoria e-thesis, 2010. http://hdl.handle.net/10063/1289.

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Chintakula, Goutam. "SCHOTTKY DIODES ON COPPER PHTHALOCYANINE NANOWIRE ARRAYS EMBEDDED IN POROUS ALUMINA TEMPLATES." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/556.

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Vertically aligned nanowire arrays of copper phthalocyanine (CuPc) and CuPc-Al Schottky diodes, of controllable diameter and length were fabricated by cathodic electrodeposition of CuPc into anodized alumina (AAO) templates, followed by annealing at 300 ºC in Argon. AAO over Aluminum tape and that over ITO-glass were both used as starting templates for the device fabrication. Depending on the dimensions of the starting AAO template, diameters of CuPc nanowires ranged from 30 nm to 40 nm and the lengths ranged from 500 nm to 1 μm. The temperature dependence of the phase and the absorption spectrum of the nanowires are reported. The electrodeposited nanowires (as prepared) had the preferred crystallite orientation of the α-phase. ITO formed the ohmic contact and Schottky contacts were formed between CuPc and aluminum. Insertion of a thin layer of PEDOT:PSS between CuPc nanowires and the ITO electrode improved the contact and reduced the series resistance by an order of magnitude. Schottky diodes were characterized and analyzed at room temperature and at cryogenic temperatures.
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Moturu, Sri Harsha. "SYNTHESIS AND CHARACTERIZATION OF P-TYPE COPPER INDIUM DISELENIDE (CIS) NANOWIRES EMBEDDED IN POROUS ALUMINA TEMPLATES." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_theses/91.

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This work focuses on a simple template assisted approach for fabricating I-III-VI semiconductor nanowire arrays. Vertically aligned nanowires of p-CIS of controllable diameter and thickness are electrodeposited, from an acidic electrolyte solution, inside porous aluminum templates using a three electrode set up with saturated calomel electrode as the reference. AAO template over ITO-glass was used as starting template for the device fabrication. The deposited CIS is annealed at different temperatures in a reducing environment (95% Ar+ 5% H2) for 30 minutes. X-ray diffraction of the nanowires showed nanocrystalline cubic phase structures with a strong orientation in the <112> direction. The effective bandgap of the deposited CIS nanowires determined using the Near Infrared (NIR) Spectrometer was found to be 1.07eV. The type of CIS electrodeposited inside the porous alumina template is determined to be p-type from the Schottky diode obtained with ITO-CIS-Au structure. Schottky diodes were characterized and analyzed at room temperature.
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Yanamanagandla, Srikanth. "SYNTHESIS AND CHARACTERIZATION OF SCHOTTKY DIODES ON N-TYPE CdTe NANOWIRES EMBEDDED IN POROUS ALUMINA TEMPLATES." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/573.

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This work focuses on the growth of vertically aligned CdTe nanowire arrays of controllable diameter and length using cathodic electro deposition in anodized alumina templates. This step was followed by annealing at 250° C in a reducing environment (95% Ar + 5% H2). AAO template over ITO-glass was used as starting template for the device fabrication. The deposited nanowires showed nanocrystalline cubic phase structures with a strong preference in [111] direction. First gold (Au) was deposited into AAO using cathodic electro deposition. This was followed by CdTe deposition into the pore. Gold was deposited first as it aids the growth of CdTe inside AAO and it makes Schottky contact with the deposited n type CdTe. CdTe was determined to be n-type from the fact that back to back diode was obtained with Au-CdTe-Au test structure. Aluminum (Al) was sputtered on the top to make the ohmic contact to the n type CdTe deposited in AAO. Analysis of Schottky diodes yielded a diode ideality factor of 10.03 under dark and 10.08 under light and reverse saturation current density of 34.9μA/cm2 under dark and 39.7μA/cm2 under light.
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Ferro, Letícia Mariê Minatogau. "Fabricação de biossensor óptico de glicose em alumina anódica porosa." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/9002.

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Porous anodic alumina (PAA) has been used as platform for the manufacture of optical sensors. Itshows chemical resistance, thermal stability, hardness, biocompatibility, high surface area which facilitates interaction with the analyte and good morphological organization with the possibility to manipulate its pore size. Furthermore, PAA shows optical responses characterized by Fabry-Pérot interferences that can be obtained by photoluminescence and reflectance spectroscopy. Besides the surface of the AAP can be modified by Layer-by-Layer technique (LbL) in order to enhance optical sensors. Changes in Fabry-Pérot interferences can be monitored and analyzed as sensor responses. In this work, LbL film were deposited using hydrochloride polyallylamine (PAH) and glucose oxidase (GOx) for the purpose of manufacturing an optical biosensor for glucose detection. A protective bilayer of PAH and poly (vinyl sulfonic acid) (PVS) was assembled. The growth of the films were monitored by photoluminescence and total reflectance techniques. In addition, biosensor tests were carried out by immersing PAA in glucose solutions with different concentrations in order to check for changes in Fabry-Pérot oscillations. Analyzing the results, orderly growth of LbL film and biosensor response were verified. Results of the biosensor test were characterized by displacements of Fabry-Pérot interferences to shorter wavelengths and by multivariate analysis. Limit of detection determined by qualitative analysis of the Fabry-Pérot oscillations was 0.1 mol.L-1 to both PAA without surface modification and modified PAA. By using partial least squares (PLS) regression, it was possible to determine glucose from 0.1 mol.L-1 with PAA without modification and 0.01 mol.L-1 for PAA with LbL film. Furthermore, it was also verified the viability of using chemometrics to examine Fabry-Pérot interferences obtained with the PAA as an alternative method shown in the literature, which involves concepts of Fabry-Pérot equation.
A alumina anódica porosa (AAP) vem sendo utilizada como plataforma na fabricação de sensores ópticos por apresentar resistência química, estabilidade térmica, dureza, biocompatibilidade, grande área superficial que facilita a interação com o analito e boa organização morfológica com a possibilidade de se manipular as dimensões de seus poros. Além disso, a AAP apresenta respostas ópticas caracterizadas pelas interferências de FabryPérot, que podem ser obtidas por espectroscopia de fotoluminescência e de reflectância. A superfície da AAP ainda pode ser modificada pela técnica de deposição por camadas, Layerby-Layer (LbL), com o intuito de se aprimorar esses sensores ópticos, sendo que mudanças nas interferências de Fabry-Pérot podem ser acompanhadas e analisadas como resposta do sensor. Neste trabalho, houve a deposição de filmes LbL de polialilamina hidroclorada (PAH) e de glicose oxidase (GOx), contendo um colchão de PAH e de ácido poli(vinil sulfônico) (PVS), com a finalidade de fabricação de um biossensor óptico de glicose. O crescimento dos filmes foi acompanhado por fotoluminescência e reflectância total. Além disso, testes dos biossensores foram realizados imergindo a AAP em soluções de glicose com concentrações diferentes a fim de se verificar alterações nas oscilações apresentadas nos espectros. A partir dos resultados obtidos foram verificados o crescimento ordenado do filme LbL e a resposta do biossensor, que foi caracterizada pelo deslocamento das interferências de Fabry-Pérot para comprimentos de onda menores e por análise multivariada. O limite de detecção determinado através da análise qualitativa das oscilações de Fabry-Pérot foi de 0,1 mol.L-1 de glicose, tanto para a AAP sem modificação superficial, quanto para a modificada. Com o emprego da regressão por mínimos quadrados parciais (PLS, do inglês “partial least squares”) foi possível a determinação de glicose a partir de 0,1 mol.L-1 para a AAP sem modificação e de 0,01 mol.L-1 para a AAP com filme LbL. Além disso, foi verificada também a viabilidade de se utilizar a quimiometria para analisar as interferências de Fabry-Pérot obtidas com a AAP como um método alternativo do apresentado na literatura, que envolve conceitos da equação de Fabry-Pérot.
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Zhou, Fan. "Growth mechanism of porous anodic films on aluminium." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/growth-mechanism-of-porous-anodic-films-on-aluminium(4e5601b4-9a30-4438-bb19-c93c71e75ec7).html.

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Fundamental research on the growth of porous anodic alumina (PAA) films has been undertaken for many years because of the complexity of the processes involved and the wide range of commercial applications. In this study, a tungsten tracer approach has been used to determine the influences of current density and electrolyte temperature on the incorporation of the tracer and its distribution and consequently, the growth mechanisms of PAA films. The efficiencies of growth of PAA films, formed during anodizing at 5 mA cm-2 in the three major forming acids at 25°C, are ~60%, due to loss of outwardly migrating Al3+ ions at the film/electrolyte interface. Thus, only the inwardly migrating O2- ions contribute to formation of the anodic oxide at the film/metal interface. The pores are developed due to flow of alumina from beneath the pore base regions toward the cell walls, which is indicated by distortion of the incorporated Al-W alloy layers and retention of the tungsten species within the anodic films. PAA films formed at a low range of current densities (<2 mA cm-2) develop by a field-assisted dissolution mode, with significant losses of aluminium and tungsten species to the electrolyte, and low expansion factors of less than 1.2. Conversely, films formed at current densities ≥2 mA cm-2 grow by a flow mechanism: flow of film material transports the alumina oxide, including the incorporated tungsten tracers, from the barrier layer regions to the cell walls, resulting in relatively thicker films at higher current densities and retention of the tungsten within the films. The tungsten remains mainly within the inner cell region of the films, with a tungsten-free region present next to the pore wall. The efficiency of film growth increases from ~0.29 to ~0.73 with increase of current density from 0.5 to 30 mA cm-2, and from ~0.26 to ~0.88 with increasing current density between 0.5 and 50 mA cm-2 for anodizing in sulphuric and oxalic acids respectively.Comparatively, for PAA films formed at 15 mA cm-2 in oxalic acid, reduction of electrolyte temperature from 20 to 1°C gives rise to a slight increase of the anodizing efficiency from ~0.67 to ~0.74; the film expansion factor also increases from ~1.32 to ~1.43. The previous arises from reduced field-assisted ejection of Al3+ ions at the decreased electrolyte temperature.Anodizing of the aluminium substrates in phosphoric acid or neutral phosphate solution generates barrier anodic alumina films and the barrier layers of porous films respectively, which comprise phosphorus-containing outer regions and a phosphorus-free inner regions. The phosphorus-containing outer region accounts for ~0.67 of the barrier films and the ~0.80 of the barrier layer of the porous films. Further, the distributions of phosphorus species are not significantly affected by the incorporation of the tungsten tracer nanolayer into the films; the influence of the phosphorus species on the outward migration of the tungsten species is also negligible.This tungsten tracer study suggests a significant influence of the flow of alumina oxide, under the high electric field, on the formation of PAA films at current densities ≥2 mA cm-2.
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Books on the topic "Porous anodic aluminium oxide"

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El-Mashri, Saleh M. Structure of anodic-oxide and hydrated oxide films on pure aluminium. [s.l.]: typescript, 1985.

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Liu, Zhao Chao. AC electrodeposition of cadmium particles in porous anodic oxide films. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1993.

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Book chapters on the topic "Porous anodic aluminium oxide"

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Xu, Qiaoling, and Guowen Meng. "Porous Anodic Aluminum Oxide." In Springer Handbook of Nanomaterials, 859–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20595-8_23.

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Valeev, Rishat G., Alexander V. Vakhrushev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. "Porous Anodic Aluminum Oxide: Structure, Properties, and Application in Semiconductor Technology." In Nanostructured Semiconductors in Porous Alumina Matrices, 19–36. Includes bibliographical references and index.: Apple Academic Press, 2019. http://dx.doi.org/10.1201/9780429398148-2.

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Lee, Woo. "Structural Engineering of Porous Anodic Aluminum Oxide (AAO) and Applications." In Nanoporous Alumina, 107–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20334-8_4.

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Qiao, Bin, Zi Long Tang, Zhong Tai Zhang, and Rui Long Zong. "The Application of Porous Anodic Aluminum Oxide Membrane in Luminescence." In High-Performance Ceramics III, 505–8. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.505.

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Doménech-Carbó, Antonio. "Electrochemistry of Porous Metals and Anodic Metal Oxide Films." In Electrochemistry of Porous Materials, 113–30. 2nd ed. Names: Domeénech-Carboó, Antonio, author. Title: Electrochemistry of porous materials / Antonio Domeénech Carboó. Description: Second edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429351624-7.

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Hebert, Kurt R. "Mathematical Modeling of Self-Organized Porous Anodic Oxide Films." In Advances in Electrochemical Sciences and Engineering, 107–44. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527690633.ch4.

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Tsuchiya, Hiroaki, Jan M. Macak, Irina Sieber, and Patrik Schmuki. "Anodic Porous Zirconium Oxide Prepared in Sulfuric Acid Electrolytes." In Materials Science Forum, 205–10. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-996-2.205.

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Habib, Khaled, K. Al-Muhanna, F. Al-Sabti, and A. Al-Arbeed. "Measurement of Aluminium Oxide-Film Thickness: Barrier Oxide Film and Oxide Porous Layer." In Diffusion in Solids and Liquids III, 283–93. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-51-5.283.

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Forn, Antonio, Josep A. Picas, Maite T. Baile, Sergi Menargues, and V. G. García. "Anodic Oxide Layer Formation on A357 Aluminium Alloy Produced by Thixocasting." In Solid State Phenomena, 80–83. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-26-4.80.

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Holmquist, M., L. Hoffer, A. Kristoffersson, and R. Lundberg. "Aluminium Phosphate Bonded Oxide Fibre Reinforced Porous Mullite-Based Matrix Composites." In High Temperature Ceramic Matrix Composites, 627–32. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527605622.ch95.

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Conference papers on the topic "Porous anodic aluminium oxide"

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HOURDAKIS, E., and A. G. NASSIOPOULOU. "ELECTRONIC DEVICES USING POROUS ANODIC ALUMINUM OXIDE." In Proceedings of International Conference Nanomeeting – 2011. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814343909_0121.

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Hsieh, Cheng-Hsuan, Yung-Hsiang Lin, Chun-Wei Tseng, and Gong-Ru Lin. "Anti-Glare and Depolarized Nano-Porous Anodic Aluminum Oxide Film." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/acpc.2015.asu1a.6.

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Huang, Chen-Han, Hsing-Ying Lin, Chien-Hsiang Fan, Shihtse Chen, Chih-Yi Liu, Yonhua Tzeng, and Hsiang-Chen Chui. "Optical characteristics of porous anodic aluminium oxide films with varied pore sizes with embedded silver nanoparticles." In 2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim. IEEE, 2011. http://dx.doi.org/10.1109/iqec-cleo.2011.6194119.

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Ben-Chao Lau, Chih-Yi Liu, Hsing-Ying Lin, Chen-Han Huang, Cheng-Wen Huang, Hsiang-Chen Chui, and Yonhua Tzeng. "Optical switching of porous anodic aluminum oxide films embedded with silver nanoparticles." In 2010 IEEE 10th Conference on Nanotechnology (IEEE-NANO). IEEE, 2010. http://dx.doi.org/10.1109/nano.2010.5697752.

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Zahariev, Alexander Stefanov, Boriana Rangelova Tzaneva, Christian Assenov Girginov, and Svetozar Krastev Andreev. "Kinetics of reanodization of porous anodic oxide films on aluminium formed in pore-forming solutions of various acids." In 2017 XXVI International Scientific Conference "Electronics" (ET). IEEE, 2017. http://dx.doi.org/10.1109/et.2017.8124412.

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Teshima, Hiromasa, Kohei Kojima, and Yang Ju. "Fabrication of Anodic Aluminum Oxide Template and Cu Nanowire Surface Fastener." In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73125.

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There is an urgent need in surface mount technology (SMT) for a nontoxic, reusable and low temperature bonding technique which can afford good mechanical support as well as electrical contact. Meanwhile in the nanotechnology, many excellent and unique structure-related properties such as the high mechanical strength, the high conductivity and the adhesion ability of gecko feet have been studied. Our lab proposes a new patterned structure of Au nanowire array named nanowire surface fastener (NSF), which cold bonding for surface mount technology can be realized at room temperature. Then various methods have been developed to fabricate nanowire, such as arc discharge, catalytic CVD growth and template synthesis, and so on. Among these methods, the template method has been widely used for preparing one-dimensional nanostructures such as metals, semiconductors, polymers, and other materials by electrochemical, electroless deposition or sol-gel technique. Especially anodic aluminum oxide template assisted way has attached considerable attention due to its unique structure properties, such as controllable pore diameter, extremely narrow pore size distribution with high densities, high aspect ratios, and ideally cylindrical pore shape. The well arranged porous anodic aluminum oxide membrane is fabricated from aluminum film by two steps zM oxalic acid electrolytes. The anodic aluminum oxide membrane was investigated for features such as pore size, interpore distance, and thickness by 40 V. It is important for fabrication of porous anodic aluminum oxide template to find out elimination of the barrier layer of oxide and the pore extending rate by 0.5 M phosphoric acid. Morphologies of surface of aluminum film between anodization process and the anodic aluminum oxide barrier layer was researched by using atomic force microscope and scanning electron microscope. Results showed that the anodic aluminum oxide having the same diameter of the pore and the well arranged pore array without branching channel was obtained. The diameter of the pore before the pore extending treatment is 42 nm and the diameter of the pore after the pore extending treatment for 30 minutes is 86 nm. It was found that the diameter of the pore increased per 15 nm by the pore extending treatment for 10 minutes. We fabricated the through-hole anodic aluminum oxide template and made Cu nanowire by the template of our own making. By using Cu nanowire, we try to produce nanowire surface fastener and evaluate its properties.
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Abdollahzadeh, M., N. Parvaini-Ahmadi, and F. Nasirpouri. "The Effect of Duration of First and Second Anodization Steps on the Ordering of Nanopores in Anodic Aluminum Oxide Templates Achieved by Three Step Anodic Oxidation Process." In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70224.

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We report on the enhancement of naturally-occurred self ordering of nanopores in anodic aluminium oxide (AAO) membrane by performing three-step anodic oxidation process. Naturally-occurred self ordering of nanopores in anodic aluminium oxide (AAO) membrane has brought it into the applications of template for fabrication of nanoscale materials. Three-step anodic oxidation method was used to achieve self-ordering of nanopores. The effect of duration of first and second steps on the ordering of nanopores was investigated. The current-time curves recorded during anodization elucidate an almost same behavior for all three steps. Scanning electron micrographs (SEM) show hexagonally arranged 45 nm pores in a manner which contribute into the formation of highly ordered areas, called domains. Larger ones are clearly observed over the surface, for samples with longer first and second anodization steps.
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Ki Hyeon Kim, T. Kyotani, and M. Yamaguchi. "Effects of RF noise suppression by carbon coated permalloy nanorods array in porous anodic aluminum oxide." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1464313.

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Ajab Khan Kasi, Jafar Khan Kasi, Nitin Afzulpurkar, Erik Bohez, Adisorn Tuantranont, and Banchong Mahaisavariya. "Notice of Retraction: Fabrication of Anodic Aluminum Oxide (AAO) nano-porous membrane on both sides of aluminum sheet." In 2010 2nd International Conference on Mechanical and Electronics Engineering (ICMEE 2010). IEEE, 2010. http://dx.doi.org/10.1109/icmee.2010.5558475.

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Tu, J. P., Y. Jv, Z. Z. Xia, and S. Y. Guo. "Friction Properties of Array Films of Amorphous Carbon Nanorods Prepared by Dual-Catalyst Growth on Porous AAO Membrane." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63437.

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The array films of amorphous carbon nanorods were prepared by thermal catalytic pyrolysis of acetylene at 650°C on a porous anodic aluminum oxide (AAO) membrane with Co-Ni catalysts. The morphology and microstructure of the array films were examined by scanning electron microscopy (SEM) and Raman spectroscopy. The friction properties of array films of amorphous carbon nanorods were investigated using a ball-on-disk tribometer and a friction force microscopy (FFM) in ambient air. The friction coefficients of the array films were influenced by the graphitization degree of the amorphous carbon nanorods. The amorphous carbon film with high graphitization degree showed low friction coefficient.
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