Fabrication and characterization of single layer and multi-layer anodic alumina membranes

Shawaqfeh, Ahmad T.; Baltus, Ruth E.

doi:10.1016/s0376-7388(98)00314-7

Cited by 40 publications

(30 citation statements)

References 20 publications

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“…The hexagonal self-order of the pores can be explained by the repulsive forces due to the volume expansion associated with the anodization process (14). By appropriate selection of the process conditions, films with pore diameters between Ͻ10 nm up to 2 m, pore density between 10 8 and 10 11 pores cm Ϫ2 , and film thickness up to 200 m can be prepared (16).…”

Section: Introductionmentioning

confidence: 99%

“…Well-polished aluminum should present a shiny/mirror-like surface; accurate polishing is crucial for obtaining high-quality aluminum oxide membranes. The pre-treated aluminum is then anodized potentiostatically or galvanostatically in a thermostatically controlled bath (14,16,21). Potentials from 10 to 160 V and current densities from 10 to 30 mA cm Ϫ2 are usually applied; however, for high pore spacing, voltages as high as 700 V have been used (22).…”

Section: Introductionmentioning

confidence: 99%

“…The thickness of the porous aluminum oxide increases linearly with 16.2 Template Deposition of Metals 679 (17). b In 10% sulfuric acid, reference (17).…”

Section: Introductionmentioning

confidence: 99%

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Template Deposition of Metals

Ugo

Moretto

2007

Handbook of Electrochemistry

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Template synthesis is a relatively simple and easy procedure which has made the fabrication of rather sophisticated nanomaterials accessible to almost any laboratory. Template synthesis requires access to instrumentation capable of metal sputtering and electrochemical deposition. The characterization of the fabricated nanostructures can be done using instrumental techniques including spectrophotometry, voltammetry, optical microscopy, atomic force microscopy, and electronic microscopies (scanning electron microscopy (SEM) and transmission electron microscopy (TEM)).The method is based on the simple but effective idea that the pores of a host material can be used as a template to direct the growth of new materials. Historically, template synthesis was introduced by Possin (1) and refined by Williams and Giordano (2) who prepared different metallic nanowires with widths as small as 10 nm within the pores of etched nuclear damaged tracks in mica. It was further developed by Martin's group (3-5) and followed by others (6) with the number of examples and applications (7) continually increasing. The nanoporous membranes usually employed as templates are alumina or track-etched polymeric membranes which are widely used as ultrafiltration membranes. Recently, metal nanostructures have also been obtained using the pores created by self-assembly in block copolymer structures under the influence of electric fields and high temperatures (8, 9).The first part of this section focuses on the main characteristics and fabrication techniques used for obtaining templating membranes and depositing metal nanostructures by suitable electroless and electrochemical procedures. Methods such as sol-gel (10-12) or chemical vapor deposition (10, 13), which have been used primarily for the template deposition of carbon, oxides, or semiconducting-based materials, will not be considered here in detail. The second part of the section focuses on the electrochemical properties of the fabricated nanomaterials with emphasis on the characteristics and applications of nanoelectrode ensembles (NEEs). Templating membranes 16.2.2

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Template Deposition of Metals

Ugo

Moretto

2007

Handbook of Electrochemistry

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“…The sample is anodizing in oxalic acid using at about 15 oC. The tar is erased by Acetone and the sample are anodizing at higher temperature until the aluminum doesn't drop much, which shows that the aluminum between the electrodes are eliminated absolutely [4,5]. Figure 3 shows the SEM picture of the alumina which act as the dielectric in CBD device.…”

Section: Design Of Cbd Apparatusmentioning

confidence: 99%

Design of air Atmospheric Pressure Diffuse Coplanar Barrier Discharge apparatus

Wang¹,

Li²,

Wang³

2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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Abstract. In this study, we explored a coplanar barrier discharge apparatus for material modification. The apparatus is introduced and several ways are proposed for fabricating the apparatus. The parameters are optimized and proposed experimentally. The results show the electrode distance and the dielectric layer thickness are very important for the discharge performance. When the electrode distance is 0.5 mm, the dielectric layer thickness is 25m, the coplanar barrier discharge plasma appears on the device in air at 760 torr.

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“…Actually, the study of one dimensional (1D) structures (e.g., nanowires, nanorods, or nanotubes), has attracted ample attention during the last few years, not only from the basic [15][16][17]36,38,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] The exchange coupling between the FM core and the AFM or FiM shell gives rise to phenomena similar to the ones observed in thin films and nanoparticles, e.g., loop shifts and coercivity enhancement. [15][16][17]36,38,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] However, new effects could emerge if the exchange coupling is induced in such a way that it directly competes with the shape anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Tunable High-Field Magnetization in Strongly Exchange-Coupled Freestanding Co/CoO Core/Shell Coaxial Nanowires

Salazar-Alvarez

Geshev

Agramunt-Puig

et al. 2016

ACS Appl. Mater. Interfaces

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The exchange bias properties of Co/CoO coaxial core/shell nanowires have been investigated with cooling and applied fields perpendicular to the wire axis. This configuration leads to unexpected exchange-bias effects. Firstly, the magnetization value at high fields is found to depend on the field-cooling conditions. This effect arises from the competition between the magnetic anisotropy and the Zeeman energies for cooling fields perpendicular to the wire axis. This allows imprinting pre-defined magnetization states to the AFM, as corroborated by micromagnetic simulations. Secondly, the system exhibits a high-field magnetic irreversibility, leading to open hysteresis loops, attributed to the AFM easy-axis reorientation during the reversal (effect similar to athermal training). A distinct way to manipulate the high-field magnetization in exchange-biased systems, beyond the archetypical effects, is thus experimentally and theoretically demonstrated.

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Fabrication and characterization of single layer and multi-layer anodic alumina membranes

Cited by 40 publications

References 20 publications

Template Deposition of Metals

Template Deposition of Metals

Design of air Atmospheric Pressure Diffuse Coplanar Barrier Discharge apparatus

Tunable High-Field Magnetization in Strongly Exchange-Coupled Freestanding Co/CoO Core/Shell Coaxial Nanowires

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