Preparation Of Porous Alumina Template And Its Application

Porous alumina template, a typical self-ordered nanochannel material with thecharacteristic feature of ordered high-aspect-ratio channels, are often used for fabricatingnano-structures assisted with template, such as nanowires, nanorods, nanotubes andtemplates for nanoimprint technology.This article focuses on how to fabricate highly ordered porous alumina template andnanowires assisted with porous alumina template and nanoimprint templates. According tothe conditions affecting the porous alumina, we fabricate experimental device that cancontrol the voltage, current and electrolyte temperature, the device can control thetemperature of the electrolyte at room temperature to-10℃range, accuracy of0.1℃.Under the conditions of the anode voltage40v, oxalic acid solution temperature of5℃,theporous alumina template possesses the characters including uniform highly oriented andnearly parallel.In order to fabricate nickel nanowires with dc deposition, firstly, we must remove thebarrier layer of porous alumina. In this paper, under the conditions without strippingaluminum, reverse voltage method and reduced-order current method are two ways toremove the barrier layer of porous alumina. Through analyzing and comparing two methods,reduced-order current method can remove the barrier layer, but the holes in the bottom ofporous alumina bifurcate; and reverse voltage method can only be effective to remove thebarrier layer in some areas. The result is that Ni nanowires with diameters of about70nm,length of about500nm are uniform.Silicon-based porous alumina template was fabricated by anodic oxidation method. Toobtain porous silicon template, the silicon was etched by taking porous alumina as a mask.Taking porous silicon as a nanoimprint template, the porous structure was transferred to thesilicon substrate using nanoimprint technology.