On the Growth of Highly Ordered Pores in Anodized Aluminum Oxide

Li, Feiyue; Zhang, Lan; Metzger, Robert M.

doi:10.1021/cm980163a

Cited by 749 publications

(691 citation statements)

References 47 publications

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“…This morphology transition is also strong evidence that totally different kinds Figure 2e shows the current density versus time (j-t) transients under 400 V. The j-t curves for unpolished and nanoimprinted samples show a typical three-stage feature in the porous film growth. 12,18,28 The current density decreases rapidly in stage I, rises up in stage II with an overshoot, and reaches a steady state in stage III. In the case of the polished sample, the current density reaches steady state directly after the initial sharp decline without any rebound, which follows the typical growth characteristics of BAA films.…”

Section: Resultsmentioning

confidence: 99%

“…19,28 These observations match well with the traditional empirical results. 12,18 In order to further interpret the growth mechanisms of the oxide membranes, AFM measurements are conducted to record surface characteristics of the different Al foils. The surface roughness (R q ) of the unpolished foil reaches 36.7 nm (Figure 3a), while electropolishing reduces the value down to 0.78 nm (Figure 3d).…”

Section: Resultsmentioning

confidence: 99%

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Morphology Defects Guided Pore Initiation during the Formation of Porous Anodic Alumina

Yang

Huang

Lin

et al. 2014

ACS Appl. Mater. Interfaces

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Aluminum (Al) anodization leads to formation of porous structures with a broad spectrum of applications. Naturally or intentionally created defects on Al surfaces can greatly affect pore initiation. However, there is still a lack of systematic understanding on the defect dependent morphology evolution. In this paper, anodization processes on unpolished, polished, and nanoimprinted Al substrates are investigated under high voltages up to 600 V in various acid solutions. A porous structure is obtained on the unpolished and nanoimprinted Al foils with rough surface texture, whereas a compact film can be rationally obtained on the polished Al foil with a highly smooth surface. The observation of surface roughness dependent oxide film morphology evolution could be originated from the high voltages, which increases the threshold requirement of defect size or density for the pore initiation. Electrostatics simulation results indicate that inhomogeneous electric field and its corresponding localized high current induced by the surface roughness facilitate the initiation of nanopores. In addition, the porous films are utilized as templates to produce polydimethylsiloxane nanocone and submicrowire arrays. The nanoarrays with different aspect ratios present tunable wettability with the contact angles ranging from 144.6°to 56.7°, which hold promising potentials in microfluidic devices and self-cleaning coatings.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Morphology Defects Guided Pore Initiation during the Formation of Porous Anodic Alumina

Yang

Huang

Lin

et al. 2014

ACS Appl. Mater. Interfaces

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“…Using these uniform and straight nanochannels of AAO film as a template, Kyotani et al [32,33] first prepared CNTs free of carbonaceous and metal impurity by the deposition of pyrolytic carbon onto the channels of the AAO film. The length, diameter and density of the as-synthesized CNTs can be uniformly tailored because of the controllability of the pore texture of AAO template [34][35][36]. Furthermore, the wall thickness and crystallinity of the CNTs can be controlled by adjusting CVD conditions, such as the composition and concentration of carbon source and the temperature and period of CVD process [33,37,38].…”

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confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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One of the most unique structural characteristics of carbon nanotubes (CNTs) differentiating from other carbon materials is their hollow nanochannles, which can be utilized for encapsulating and loading foreign matters. The anodic aluminum oxide (AAO) template technique enables the diameter, length, and cap structure control of the replicated CNTs, and thus shows advantages in pore structure control over the traditional CNT growth approaches. This review details the synthesis of CNTs with tunable diameter, length, wall thickness, and crystalline by using the AAO template method. The doping of heteroatoms and filling of foreign matters into AAO-CNTs are also addressed. Moreover, the main challenges and developing trends of the AAO template method are discussed.carbon nanotubes (CNTs), anodic aluminum oxide (AAO) template method, controllability Citation:Hou P X, Liu C, Shi C, et al. Carbon nanotubes prepared by anodic aluminum oxide template method.

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“…Therefore, it is important to understand and control the pore size and morphology of PAA membranes [9][10][11]. The anodization conditions such as voltage, current density, pH, temperature, and time of anodization play a critical role in controlling the textural properties of AAO membrane in specific electrolyte [12,13].…”

Section: Introductionmentioning

confidence: 99%

Formation of self-ordered porous anodized alumina template for growing tungsten trioxide nanowires

et al. 2014

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Uniform porous anodized aluminum oxide (AAO) membrane has been synthesized by two-step anodization for fabricating tungsten trioxide (WO 3 ) nanowires. Under assayed conditions, uniform porous structure of alumina (Al 2 O 3 ) membrane with long range ordered hexagonal arrangements of nanopores was achieved. The self-assembled template possesses pores of internal diameter of 50 nm and interpore distance (d int ) of 80 nm with a thickness of about 80 lm, i.e., used for fabrication of nanostructures. WO 3 nanowires have been fabricated by simple electroless deposition method inside Al 2 O 3 nanopores. SEM images show tungsten trioxide nanowire with internal diameter of about 50 nm, similar to porous diameter of AAO template. XRD results showed that nanowires exist in cubic crystalline state with minor proportion of monoclinic phase.

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On the Growth of Highly Ordered Pores in Anodized Aluminum Oxide

Cited by 749 publications

References 47 publications

Morphology Defects Guided Pore Initiation during the Formation of Porous Anodic Alumina

Morphology Defects Guided Pore Initiation during the Formation of Porous Anodic Alumina

Carbon nanotubes prepared by anodic aluminum oxide template method

Formation of self-ordered porous anodized alumina template for growing tungsten trioxide nanowires

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