A facile route for room temperature synthesis of alumina nanostructures

Array of alumina nano rods on the porous anodic alumina membrane scaffold has been achieved by anodization of high pure Al sheet in 0.4M phosphoric acid. A two step anodization methodology was adopted to grow the porous alumina membranes with a pore size and wall thickness of 80 nm and 100 nm respectively followed by a prolonged anodization to grow bunches of alumina nano rods and a few nano walls. The X-ray diffraction and energy dispersive spectra confirmed the phase and composition of the nano structures respectively.