Open Access Nano Express

Distinguishing nanowire and nanotube formation by the deposition current transients

Mariana P Proenca12, Célia T Sousa1, João Ventura1, Manuel Vazquez2 and João P Araujo1*

Author Affiliations

1 IFIMUP and IN - Institute of Nanoscience and Nanotechnology and Departamento de Física e Astronomia, Universidade do Porto, Rua do Campo Alegre 687, Porto, 4169-007, Portugal

2 Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid, 28049, Spain

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Nanoscale Research Letters 2012, 7:280  doi:10.1186/1556-276X-7-280

Published: 31 May 2012

Abstract

High aspect ratio Ni nanowires (NWs) and nanotubes (NTs) were electrodeposited inside ordered arrays of self-assembled pores (approximately 50 nm in diameter and approximately 50 μm in length) in anodic alumina templates by a potentiostatic method. The current transients monitored during each process allowed us to distinguish between NW and NT formation. The depositions were long enough for the deposited metal to reach the top of the template and form a continuous Ni film. The overfilling process was found to occur in two steps when depositing NWs and in a single step in the case of NTs. A comparative study of the morphological, structural, and magnetic properties of the Ni NWs and NTs was performed using scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometry, respectively.

Keywords:
Electrodeposition; Crystallographic texture; Ordered arrays; Nickel; Nanoporous alumina templates