Synthesis of Highly Dense Alumina Nanofibers
Formation of highly ordered nanoporous alumina membranes by anodizing high purity aluminum under optimum conditions (i.e., anodization time, electrolyte temperature, and cell voltage) in various electrolyte solutions is a well established process. Significant efforts have been made in the last years to synthesize alumina nanostructures, and several methods have been reported, including chemical etching followed by thermal treatment, catalyst-assisted or catalyst-free deposition, mechanical cleavage of porous alumina membranes, etc. In this project we study the formation of a wide range of alumina nanostructures, including nanotubes/nanochannels, nanoplates, and nanofibers, by using a similar anodization and etching process as the one that yields nanopores, under slightly modified experimental conditions. In particular, the effects of the anodization voltage, time, and temperature, as well as the effects of the etching time on the formation and the properties of the alumina nanofibers are analyzed.
1.A. Pancholi, V.G. Stoleru, C. Kell, A novel technique to synthesize highly dense alumina nanostructures,Nanotechnology 18, 215607 2007