Highly ordered palladium (Pd) nanowire arrays were successfully prepared by pulsed electrodeposition (PED) method using anodized aluminum oxide (AAO) nanotemplate. The Pd nanowire arrays are standing freely on a titanium-coated silicon wafer after removing the AAO template. The titanium film is used for providing conducting surface for the electrodeposition of palladium and also for removing alumina barrier layer formed as a result of the amodization of aluminum film, The diameter and length of the palladium nanowire in the arrays are about 80 nm and 0.8 mu m, respectively. It has been shown that the well-ordered and free-standing Pd nanowire arrays can be grown uniformly in a relatively large area of about 5 cm(2). (c) 2005 Elsevier B.V. All rights reserved.