Electrostatic capacitance of TiO2 nanowires in a porous alumina template

Abstract

Titanium oxide (TiO2) nanowires were prepared for an electrolytic capacitor application by the automatic dippingtechnique using a porous alumina template. The automatic dipping technique allows us toexactly control the dipping rate so that we can obtain homogenous infiltration ofnanowires in the porous alumina membrane, even though the solution is very acidic.From the TEM, SEM and XRD measurements, we confirmed that anatase phaseTiO2 nanowires are highly infiltrated into the porous alumina template. Inaddition, the electrostatic capacitance of nanowires was measured andcompared with a theoretical calculation using an effective thickness(δe). We found that the effective thickness corresponds to the mean radius of nanowires andthe experimental measurements were in good agreement with the calculations.