Fabrication and Structural Characteristics of Nanocrystalline Fe-Pt Thin Films and Fe-Pt Nanowire Arrays Embedded in Alumina Films on ITO/Glass

摘要

We described a new method to fabricate Fe-Pt binary alloy nanomaterials (nanocrystalline thin films and nanowire arrays embedded in porous alumina films) through a direct current electrodeposition in a novel bath with a simple composition on a glass substrate covered with a tin-doped indium oxide (ITO) film.The morphology and compositions of the Fe-Pt alloy filmsanowires are investigated by FESEM with an EDX analyzer,and the crystallographic structures of the two Fe-Pt nanomaterials were determined by XRD and HRTEM.Uniform Fe-Pt alloy films with bright appearance and controllable compositions in 14-90 atom % Fe were achieved on copper and ITO/glass within a broad current density range from 20 to 400 A/m~2.The Fe-Pt nanowires (PHI approx=50 nm) embedded in anodic alumina films on ITO/glass were dense and parallel,with a high pore-filling of approx=95%,giving a high wire density of approx=4.7x10~(14) wire/m~2.In particular,the Fe-Pt films and nanowires with a composition close to 1:1 Fe/Pt were polycrystalline with crystal sizes of 15-20 nm (films) and 3-6 nm (wires) across,which were identified to be cubic (Pt,Fe) phase with a lattice constant a=3.816 A.