Custom-designed arrays of anodic alumina nanochannels with individually tunable pore sizes

Tsai, Kun-Tong; Liu, Chih‐Yi; Wang, Huai-Hsien; Liu, Tingyu; Lai, Ming Yang; He, Jr Hau; Wang, Yuh‐Lin

doi:10.1088/0957-4484/25/33/335301

Cited by 5 publications

(8 citation statements)

References 37 publications

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“…Figure 2. Multiscale AAO nanochannel templates for linearly joint nanomaterials.A two-step anodization process produced hexagonal close packed pore arrays that have pore to pore distance of 100 nm under 40 V with 0.3 M oxalic acid at 8 °C 24,26. After the formation of well-ordered pores of AAO film, a pore widening procedure was followed to control the pore-size as a function of etching time with phosphoric acid.…”

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Multidimensional Helical Nanostructures in Multiscale Nanochannels

et al. 2015

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We have investigated the various morphological changes of helical nanofilament (HNF; B4) phases in multiscale nanochannels made of porous anodic aluminum oxide (AAO) film. Single or multihelical structures could be manipulated depending on the AAO pore size and the higher-temperature phase of each molecule. Furthermore, the nanostructures of HNFs affected by the chemical affinity between the molecule and surface were drastically controlled in surface-modified nanochannels. These well-controlled hierarchical helical structures that have multidimensions can be a promising tool for the manipulation of chiral pores or the nonlinear optical applications.

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confidence: 99%

Multidimensional Helical Nanostructures in Multiscale Nanochannels

et al. 2015

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“…FIB direct‐write lithography has the advantage of the convenience of varying patterned structures because it can precisely control the irradiation positions, beam energy, and ion dose. Such an advantage has been exploited to create various AAO films with nanochannels arranged in novel geometry and will be discussed later …”

Section: Development Toward Creation Of Guided Anodic Alumina Nanochamentioning

confidence: 99%

“…The technique of FIB selected‐area closing–reopening of AAO nanochannels has been further applied to fabricate anodic alumina nanochannels with individually tunable pore sizes, as shown in Figure . Similar to the channel‐closing process, FIB bombardment was used to create a thin capping layer partially covering the surface of a guided AAO, as shown in Figure d.…”

Section: Structure Modification Of Guided Aao Nanochannelsmentioning

confidence: 99%

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Creating anodic alumina nanochannel arrays with custom‐made geometry

Liu

Wang

2019

J Chinese Chemical Soc

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Porous anodic alumina oxide (AAO) is one of the most commonly used nanotemplates for growing arrays of nanoparticles, nanowires, nanocomposites, and nanoarchitectures because its pores, which are of a very uniform size, can grow longitudinally into arrays of self-aligned nanochannels with an extremely high aspect ratio. Furthermore, under specific combinations of anodization voltage and electrolyte, the lateral positions of nanochannels can self-organize into arrays of two-dimensional hexagonally close-packed lattices with domain sizes on the order of few tens of lattice units. The domain size can be greatly increased by prepatterning the Al surface with custom-designed nanoconcaves prior to the anodization process. The concaves guide the growth fronts of nanochannels and lead to the formation of an ideally long-range ordered lattice of nanochannel array. Such concaves have been fabricated by many methods, such as stamp imprinting, grating imprinting, and focused ion beam direct writing. In this review, we summarize the development of various methods to create AAO nanochannel arrays with custommade geometry and discuss the mechanism responsible for the guiding process. K E Y W O R D Sanodic alumina, guided growth of anodic nanochannels, nanochannel arrays, nanotemplate

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“…[6][7][8][9] Anodic aluminum oxide formed by anodizing has typically been classified into two different groups with distinct nanomorphology characteristics: barrier and porous oxides. 10,11 An anodic barrier oxide can be obtained by anodizing in neutral solutions, and it possesses a thin, compact amorphous layer.…”

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Highly Ordered Anodic Alumina Nanofibers Fabricated via Two Distinct Anodizing Processes

Nakajima

Kikuchi

Natsui

2015

ECS Electrochemistry Letters

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Fabrication of high-density, highly ordered anodic alumina nanofibers was demonstrated via two distinct anodizing processes: porous and fibrous oxide formations. Highly ordered aluminum dimple arrays were fabricated via sulfuric/oxalic acid anodizing and selective porous alumina dissolution. Subsequent pyrophosphoric acid anodizing using the nanostructured aluminum surface caused anodic alumina nanofibers to grow preferentially at the six apexes of the ordered hexagonal aluminum dimples under the appropriate electrochemical conditions. Well-defined, high-density, highly ordered anodic alumina nanofibers with 37-75 nm periodic spacing and at densities of 1.4-5.6 × 10 14 m −2 were successfully fabricated on the aluminum surface via two distinct anodizing processes. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0021505eel] All rights reserved.Manuscript submitted February 11, 2015; revised manuscript received February 27, 2015. Published March 17, 2015 Anodizing is a very important surface finishing of aluminum and its alloys for corrosion protection, 1-3 electronic devices, 4,5 and micro-/nano-fabrication.6-9 Anodic aluminum oxide formed by anodizing has typically been classified into two different groups with distinct nanomorphology characteristics: barrier and porous oxides.10,11 An anodic barrier oxide can be obtained by anodizing in neutral solutions, and it possesses a thin, compact amorphous layer.12,13 In contrast, an anodic porous oxide can be formed by anodizing in acidic solutions and consists of numerous thick nanoscale hexagonal cells with nanopores at the center.14-16 Notably, self-ordering of the hexagonal cells can be achieved at the maximum voltage required to induce a high current density without burning, resulting in the formation of highly ordered porous alumina. [17][18][19][20][21][22] Anodic alumina possessing nanopores with a wide range of diameters, from tens to several hundreds of nanometers, is assembled during these anodizing techniques. [23][24][25] Porous oxide films with nanopores can also be formed on the aluminum substrate via anodizing in alkaline solutions, but it is difficult to obtain a well-ordered porous oxide film. [26][27][28] Because the nanomorphology of an anodic oxide is essentially limited to barrier or porous oxides, the discovery of an additional anodic oxide with different nanofeatures would expand the applicability of anodizing.Very recently, we reported a third-generation anodic oxide, anodic alumina nanofibers, fabricated via anodizing in concentrated pyrophosphoric acid. 29 During this anodizing process, alumina nanofibers measur...

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Custom-designed arrays of anodic alumina nanochannels with individually tunable pore sizes

Cited by 5 publications

References 37 publications

Multidimensional Helical Nanostructures in Multiscale Nanochannels

Multidimensional Helical Nanostructures in Multiscale Nanochannels

Creating anodic alumina nanochannel arrays with custom‐made geometry

Highly Ordered Anodic Alumina Nanofibers Fabricated via Two Distinct Anodizing Processes

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