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Abstract
Double-walled oxide nanotube structures are interesting for a wide range of applications, from photocatalysis to drug delivery. In this work, a progressive oxidation method to fabricate double-walled nanotube structures is reported in detail. The approach is based on the electrodeposition of metallic iron nanowires, in porous alumina templates, followed by a selective chemical etching, nanoscale Kirkendall effect, a fast oxidation and out-diffusion of the metallic core structure during thermal annealing. To validate the formation mechanism of such core-shell structure, chemical composition and atomic structure were assessed. The resulting hematite nanotubes have a high degree of uniformity, along several microns, and a nanoscopic double-walled structure.
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Details
1 LEPABE - Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, Porto, Portugal
2 IFIMUP and Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Porto, Portugal; Department of Physics, University of Oviedo, Oviedo, Spain
3 Instituto de Ciencia de Materiales de Aragón (ICMA), Universidad de Zaragoza-CSIC, Zaragoza, Spain; Laboratorio de Microscopías Avanzadas (LMA) - Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Zaragoza, Spain; Departamento de Física de la Materia Condensada, Universidad de Zaragoza, Zaragoza, Spain
4 IFIMUP and Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Porto, Portugal