A nanowire is a nanostructure, with the diameter of the order of a nanometer (10−9 meters) nanowires can be defined as structures that have a thickness or diameter constrained to tens of nanometers or less and an unconstrained length. At these scales, quantum mechanical effects are important which coined the term "quantum wires". Many different types of nanowires exist, including superconducting, metallic, semiconducting and polymeric. The use of polymer nanowires has many advantages in the industry[1]. polyaniline nanowire is an electrically conducting polymer that can be used as an active layer for sensors whose conductivity change can be used to detect chemical or biological species[2]. Nanostructured PANI, with different morphologies, has been synthesized using various techniques such as template synthesis, self-assembly, emulsions and interfacial polymerization[3] In the present work, we describe a systematic study of the electrochemical growth of polyaniline nanowire from aqueous H2SO4 solutions in anodic aluminum oxide (AAO) membranes.[4-7]. Anodic aluminum oxide (AAO) membranes (Whatman) with the pore size of 200 nm and thickness of 60 μm were used as the templates for the polymerization of PANI nanowire arrays. Electrochemical experiments were carried out with PC-controlled auto lab instrument, in a one-compartment, three-electrode cell at room temperature, using a platinum plate as a counter electrode, Ag/AgCl electrode as a reference electrode and the working electrode for the electropolymerization was achieved by depositing a 120 nm thick Au layer on the branched side of the template with a BOC Edwards magnetron sputter coater. The polymerization was conducted under varying concentrations of H2SO4 0.75 M as supporting electrolyte and aniline 0.5 M as monomer. The template-based electropolymerization of aniline was performed by means of, cyclic voltammetry sweeping the potential between -200mV to 950mV, at a scan rate of 20 mV /s for 20 cycles [8-10]. Whe
