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Stained Glass Effect in Anodic Aluminum Oxide Formed in Selenic Acid
Sergey E Kushnir1, Nadezhda P Devyanina1, Ilya V Roslyakov1
1Lomonosov Moscow State University, Moscow 119991, Russia.
The Journal of Physical Chemistry Letters
|January 3, 2024
Summary
Aluminum
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Anodic aluminum oxide (AAO) possesses unique properties making it valuable for advanced applications.
- Selenic acid electrolytes enable the creation of AAO with low porosity and high optical transparency, suitable for photonic crystals.
Purpose of the Study:
- To investigate how the crystallographic orientation of aluminum (Al) affects the properties of AAO.
- To understand the influence on electrochemical oxidation rate, growth rate, porosity, and refractive index.
Main Methods:
- Utilizing a 1 M H2SeO4 electrolyte for electrochemical oxidation of Al.
- Employing a cyclic anodization regime to fabricate AAO photonic crystals (PhCs).
- Measuring AAO growth rates via the wavelength positions of photonic band gaps.
Main Results:
- The crystallographic orientation of Al grains significantly impacts AAO properties.
- Growth rates varied by up to 22.6% at 40-45 V anodization voltage due to crystallographic orientation.
- This variation leads to a visible 'stained glass effect'.
Conclusions:
- Crystallographic orientation is a critical factor in tailoring AAO properties for photonic crystal applications.
- The observed 'stained glass effect' offers a visual indicator of orientation-dependent growth.
- Selenic acid-based anodization provides a route to controlled AAO fabrication for nanotechnology.
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