Journal ArticleDOI
Fast fabrication of long-range ordered porous alumina membranes by hard anodization
TLDR
A new oxalic-acid-based anodization process for long-range ordered alumina membranes that establishes a new self-ordering regime with interpore distances, (Dint)=200–300 nm, allowing 2,500–3,500% faster oxide growth with improved ordering of the nanopores.Abstract:
Nanoporous anodic aluminium oxide has been widely used for the development of various functional nanostructures. So far these self-organized pore structures could only be prepared within narrow processing conditions. Here we report a new oxalic-acid-based anodization process for long-range ordered alumina membranes. This process is a new generation of the so-called "hard anodization" approach that has been widely used in industry for high-speed fabrication of mechanically robust, very thick (>100 microm) and low-porosity alumina films since the 1960s. This hard anodization approach establishes a new self-ordering regime with interpore distances, (D(int))=200-300 nm, which have not been achieved by mild anodization processes so far. It offers substantial advantages over conventional anodization processes in terms of processing time, allowing 2,500-3,500% faster oxide growth with improved ordering of the nanopores. Perfectly ordered alumina membranes with high aspect ratios (>1,000) of uniform nanopores with periodically modulated diameters have been realized.read more
Citations
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TiO2 nanotubes: Self-organized electrochemical formation, properties and applications
Jan M. Macak,Hiroaki Tsuchiya,Andrei Ghicov,Kouji Yasuda,Robert Hahn,Sebastian Bauer,Patrik Schmuki +6 more
TL;DR: In this article, an overview and review on self-organized TiO2 nanotube layers and other transition metal oxide tubular structures grown by controlled anodic oxidation of a metal substrate is given.
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Templated Techniques for the Synthesis and Assembly of Plasmonic Nanostructures
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Porous anodic aluminum oxide: anodization and templated synthesis of functional nanostructures.
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Self-assembly of highly efficient, broadband plasmonic absorbers for solar steam generation.
TL;DR: A self-assembling plasmonic absorber which can enable an average measured absorbance of ~99% across the wavelengths from 400 nm to 10 μm is reported, the most efficient and broadband plas Monte Carlo absorber reported to date.
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Self-ordering electrochemistry: a review on growth and functionality of TiO2nanotubes and other self-aligned MOx structures
Andrei Ghicov,Patrik Schmuki +1 more
TL;DR: The present review addresses the formation, properties and applications not only of TiO(2) nanotubes but also of related transition metal oxides.
References
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Journal ArticleDOI
Ordered Metal Nanohole Arrays Made by a Two-Step Replication of Honeycomb Structures of Anodic Alumina
Hideki Masuda,Kenji Fukuda +1 more
TL;DR: A highly ordered metal nanohole array (platinum and gold) was fabricated by a two-step replication of the honeycomb structure of anodic porous alumina that showed a notable color change compared with bulk gold.
Journal ArticleDOI
Hexagonal pore arrays with a 50-420 nm interpore distance formed by self-organization in anodic alumina
TL;DR: In this article, self-organized hexagonal pore arrays with a 50-420 nm interpore distance in anodic alumina have been obtained by anodizing aluminum in oxalic, sulfuric, and phosphoric acid solutions.
Journal ArticleDOI
Self-organized formation of hexagonal pore arrays in anodic alumina
TL;DR: In this article, the conditions for the self-organized formation of ordered hexagonal structures in anodic alumina were investigated for both oxalic and sulfuric acid as an electrolyte.
Journal ArticleDOI
Structural Features of Oxide Coatings on Aluminum
TL;DR: In this paper, the structural features of the porous type of anodic oxide coating applied to aluminum have been investigated with the electron microscope, and formulas were given for calculating the cell size and pore volume of these coatings.
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Ordered Metal Nanohole Arrays Made by a Two-Step Replication of Honeycomb Structures of Anodic Alumina
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