Characterization of the Nanoporous Template Using Anodic Alumina Method

Porous anodic aluminum oxide (AAO) is deposited on a 5 cm × 5 cm tin-doped indium oxide (ITO)/glass substrate, and the AAO/ITO/glass structure thus formed is used to reduce the amount of unreacted Al inside the AAO template, thereby reducing the transmittance of the AAO/glass structure. The enhancement of transmittance is achieved by modulating the diameter of the pores and varying the applied bias. The proposed AAO can be used at a high applied bias (up to 120 V) to improve the uniformity of the current density. Following pore-widening treatment and posttreatment annealing, the morphologies and transmittance of the AAO/ITO/glass structure were also investigated.

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Influence of the anodization conditions and chemical treatment on the formation of alumina membranes with defined pore diameters

Journal of Porous Materials ◽

10.1007/s10934-021-01052-w ◽

2021 ◽

Author(s):

Iwona Dobosz

Keyword(s):

Aluminum Oxide ◽

Chemical Treatment ◽

Anodic Aluminum Oxide ◽

Pore Diameter ◽

Operating Conditions ◽

Oxide Growth ◽

Pore Density ◽

Anodic Aluminum ◽

Pore Widening ◽

Oxide Membranes

AbstractPorous anodic aluminum oxide membranes were fabricated via two-step anodization of aluminum in 0.3 M H2C2O4, 0.3 M H2SO4 and 0.17 M H3PO4 solutions. The parameters of the oxide film such as: pore diameter (Dp), interpore distance (Dc), porosity (P) and pore density (ρ) can be completely controlled by the operating conditions of the anodization. Additionally, the pore diameters and pore density can be controlled via a chemical treatment (pore opening/widening process). The effect of anodizing conditions such as the applied voltage, type of electrolyte and purity of the substrate on the rate of porous oxide growth are discussed. The obtained results were compared with the theoretical predictions and data that has been reported in the literature. The influence of the duration of chemical etching on the structural features of the oxide membranes was studied. On the based on qualitative and quantitative FFT analyzes and circularity maps, it was found that the nanostructures of anodized aluminum have the maximum order under certain specified conditions. The presence of alloying elements affects not only the rate of oxide growth but also the morphology of the anodic aluminum oxide. The rate of oxide growth depends on the electrolyte type and temperature. During chemical treatment of the oxide films pore diameter increases with the pore widening time and the highest pore widening was observed in phosphoric acid solution.

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Template Synthesis of Indium Nanowires Using Anodic Aluminum Oxide Membranes

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.300 ◽

2008 ◽

Vol 8 (9) ◽

pp. 4488-4493 ◽

Cited By ~ 4

Author(s):

Feng Chen ◽

Adrian H. Kitai

Keyword(s):

Aluminum Oxide ◽

Template Synthesis ◽

Anodic Aluminum Oxide ◽

Preferred Orientation ◽

Hydraulic Pressure ◽

X Ray Diffraction ◽

Aao Template ◽

X Ray ◽

Anodic Aluminum ◽

Oxide Membranes

Indium nanowires with diameters approximately 300 nm have been synthesized by a hydraulic pressure technique using anodic aluminum oxide (AAO) templates. The indium melt is injected into the AAO template and solidified to form nanostructures. The nanowires are dense, continuous and uniformly run through the entire ∼60 μm thickness of the AAO template. X-ray diffraction (XRD) reveals that the nanowires are polycrystalline with a preferred orientation. SEM is performed to characterize the morphology of the nanowires.

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