Abstract
We report the growth of silver nanowires with varying diameters in porous anodic aluminum-oxide (AAO) membranes by using the electroless deposition approach. This objective is carried out in 2 phases. In Phase 1, AAO membranes on high purity aluminum foils are electrochemically grown by a double anodization procedure. Three different electrolytes, sulphuric acid (H2SO4), oxalic acid (H2C2O4) and phosphoric acid (H3PO4), are employed to produce membranes with varying pore diameters. Other parameters such as interpore distance, barrier layer thickness and membrane thickness are also explored. In addition, characterization to modify the pore diameter and open the barrier layer of free standing AAO templates has been carried out. In Phase 2, metallic silver nanowires are grown by electroless deposition inside pores with varying diameters in AAO membranes. AAO membranes immersed in aqueous silver nitrate solutions are thermally reduced, and the resulting silver nanowires are characterized by using a scanning electron microscope (SEM).
Highlights
Anodic aluminum-oxide membranes have been widely studied due to their numerous advantages in the manu-How to cite this paper: Kotha, R., Strickland, D. and Ayon, A.A. (2015) Nanowire Fabrication in Porous Alumina Tempalets Produced by Employing Sulphuric, Oxalic and Phosphoric Acids
The interpore distance in the oxalic acid-formed membranes was of medium size, with the pore diameter occupying a little less than a quarter of the cell
Various anodic aluminumoxide (AAO) membrane parameters such as pore diameter, interpore distance and barrier layer thickness were explored with different electrolytes solutions such as sulphuric, oxalic and phosphoric acids
Summary
Anodic aluminum-oxide membranes have been widely studied due to their numerous advantages in the manu-How to cite this paper: Kotha, R., Strickland, D. and Ayon, A.A. (2015) Nanowire Fabrication in Porous Alumina Tempalets Produced by Employing Sulphuric, Oxalic and Phosphoric Acids. Nanowires [1], nanotubes [2], nanorods [3], and nanodots [4] have been grown or fabricated in patterns for use in nanoscale devices using AAO membranes as templates. The simplest and most inexpensive approach to growing AAO membranes is by a double anodization procedure in which aqueous electrolyte solutions such as sulphuric, oxalic, or phosphoric acid oxidize and pattern an aluminum foil [7]-[11]. Critical parameters such as interpore distance, pore diameter, barrier layer thickness and membrane thickness are changed by varying electrolyte concentration, voltage, growth time and temperature. Silver nanowires are fabricated in the AAO pores by the thermal reduction of a silver nitrate solution bath
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