Novel AAO films and hollow nanostructures fabricated by ultra-high voltage hard anodization

Li, Yi; Ling, Zhiyuan; Shuoshuo, Chen; Hu, Xing; Xin-Hua, HE

doi:10.1039/b914703a

Cited by 69 publications

(36 citation statements)

References 25 publications

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“…From these results we hypothesize that the ethanol concentration-dependant breakdown effect is caused by the rapid heat generation at the bottom of the nanopores, which leads to the catastrophic local flow of current across the oxide barrier layer. EtOH has been frequently used as a coolant to achieve HA condition under high electric field conditions at temperatures below 0 C [28][29][30]. However, our result demonstrated that EtOH is not efficient to dissipate the heat generated during HA process when the temperature of the electrolyte is relatively high.…”

Section: Fabrication Of Ultra-short Aants By Modifying Electrolytecontrasting

confidence: 76%

Rational Design of Ultra-Short Anodic Alumina Nanotubes by Short-Time Pulse Anodization

Wang

Santos

Evdokiou

et al. 2015

Electrochimica Acta

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Section: Fabrication Of Ultra-short Aants By Modifying Electrolytecontrasting

confidence: 76%

Rational Design of Ultra-Short Anodic Alumina Nanotubes by Short-Time Pulse Anodization

Wang

Santos

Evdokiou

et al. 2015

Electrochimica Acta

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“…The hard anodizing allows the fabrication of a self-ordered porous oxide with various cell diameters under high voltage conditions: sulfuric acid at 27-80 V to 72-145 nm [104], oxalic acid at 120-150 V to 220-300 nm [105], and phosphoric acid at 195 V to 320-380 nm [106]. In addition, several research groups have reported using the advanced hard anodizing technique to further extend the self-ordering voltage and the corresponding cell diameters [107][108][109][110][111]. Noh et al have reported the fabrication of highly ordered nanotubular aluminum oxide by hard anodizing [112].…”

Section: Fabrication Of Highly Ordered Porous Aluminum Oxidementioning

confidence: 99%

Porous Aluminum Oxide Formed by Anodizing in Various Electrolyte Species

Kikuchi¹,

Nakajima²,

Nishinaga³

et al. 2015

CNANO

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Anodizing of aluminum and its alloys is widely investigated and used for corrosion protection, electronic devices, and micro-/nanostructure fabrication. Anodizing of aluminum in acidic solutions causes formation of porous aluminum oxide films, which consists of numerous hexagonal cells perpendicular to the aluminum substrate, and each cell has nanoscale pores at its center. Recently, highly ordered porous aluminum oxide has been widely investigated for various novel nanoapplications. In this review article, we introduce the fundamentals of anodic oxide films including barrier and porous oxides. Then, we summarize the electrolyte species used so far for porous oxide fabrication and describe the self-ordering conditions during anodizing in these electrolyte solutions. Fabrication of highly ordered porous oxides through the vertical section can be achieved by a two-step anodizing and nanoimprint technique. Various nanoapplications based on the ordered porous oxide are also introduced.

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“…49 It worth mentioning that more Al(OH) 3 can be formed under certain anodization conditions with a higher U a . 49,52 Considering that Al(OH) 3 has a relatively small dissociation energy (3.80 kcal mol −1 ), it will dehydrate easily during high voltage anodization thus leading to volume contraction of the AAO cell walls. 16,49,52 Accordingly, it is not surprising to see that ξ decreases with U a (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

A Facile Method for Controllable Fabrication of Porous Anodic Aluminum Oxide Templates with Multiple-Scale Structures

Jin

Qin

et al. 2015

J. Electrochem. Soc.

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Porous anodic aluminum oxide (AAO) templates with diverse nano/submicron/micron multiple-scale structures have been fabricated by a facile and controllable two-step anodization process. The first step anodization has been achieved by using a simple competitive growth process with high anodization voltage (U a ) in ethanol-oxalic acid mixture electrolytes. The effects of U a (300-600 V), anodization current density (J a , 100-200 A m −2 ), and the proportion of ethanol adding (0.3 M oxalic acid : ethanol = 1 : 1, 3 : 2, V/V) on the submicron/micron structures of AAO templates have been investigated in detail. The second step anodization has been conducted under relatively lower U a of 30 V and 40 V, respectively. The effects of U a , etching process, and anodization time on the nanostructures of as-fabricated porous AAO templates have been studied carefully. In addition, related intrinsic formation mechanisms have also been investigated. Based on these quantitative experimental results, the fabrication of multiple-scale porous AAO films with diverse nano/submicron/micron structures can be more controllable and designable, facilitating their practical applications in simple template synthesis of complex multiple-scale functional materials.Anodic aluminum oxide (AAO) films prepared by aluminum anodization have been investigated and used in numerous fields for more than 150 years. 1-24 In 1953, Keller et al. investigated the structural features of porous type AAO films in detail with the electron microscope and proposed a corresponding structural model. 5 Since then, porous AAO films which contain a large number of nanopores have attracted considerable attention. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] In 1995, Masuda et al. firstly proposed a pre-patterning fabrication process which contains the first anodization for forming highly ordered dimples on the aluminum surface, and the second anodization for obtaining ideally ordered porous AAO films. 12,13 At present, they have become one of the most commonly used nanoporous templates for the fabrication of diverse nanomaterials (e.g., nanowire, nanotube, and nanodot) because of their apparent advantages, such as good reproducibility, adjustable pore size, and controllable film thickness, etc. 25-35 Moreover, they can also be used as functional materials for many applications: e.g., biotechnology, photonics, sensors. [36][37][38][39][40] Nowadays, although porous AAO films can be applied in many practical fields, there are still some shortcomings which greatly limit their applications: most of the fabricated porous AAO films have a simple honeycomb-like microstructure, and their pore size is typically limited to nanoscale or submicron scale. Based on these structural features, it is difficult for their template synthesis of functional materials with micron scale or nano/submicron/micron multiple-scale structures. Over the last decade, tremendous research has been focused on the development of multiple-scale materials which have become a h...

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Novel AAO films and hollow nanostructures fabricated by ultra-high voltage hard anodization

Cited by 69 publications

References 25 publications

Rational Design of Ultra-Short Anodic Alumina Nanotubes by Short-Time Pulse Anodization

Rational Design of Ultra-Short Anodic Alumina Nanotubes by Short-Time Pulse Anodization

Porous Aluminum Oxide Formed by Anodizing in Various Electrolyte Species

A Facile Method for Controllable Fabrication of Porous Anodic Aluminum Oxide Templates with Multiple-Scale Structures

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