ANM
2010
3rd
International Conference on Advanced Nano Materials
12-15 September 2010 - Agadir, Morocco
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Abstract
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ANMM121 |
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FABRICATION AND CHARACTERIZATION OF NIO NANOWIRES INSIDE NANOPOROUS ALUMINA TEMPLATES |
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M. P. Proenca1,2, C. T. Sousa1, D. C. Leitao1,2, J. Ventura1, M. Vazquez2, J. P. Araujo1 |
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1-IFIMUP and IN – Institute of Nanoscience and Nanotechnology, Rua do Campo Alegre 687, 4169-007 Porto, Portugal
2-Instituto de Ciencia de Materiales ICMM – CSIC, Campus Universitario 28049 Cantoblanco Madrid, Spain |
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With
the growing interest in nanotechnology, nanomaterials are gaining more
importance every day. Spherical and high aspect ratio nanoparticles
have been produced, showing many applications in biomedicine and energy
storage. Most of these nanoparticles are prepared either from vapor or
solution phase growth from a seed, on top of a film or inside a
template. However, nanowires (high aspect ratio nanoparticles) present
some advantages over spherical nanoparticles, as they exhibit
anisotropic (shape-dependent) collective properties (e.g. absorbency,
conductivity photoluminescence, magnetization, etc). To this end, the
use of alumina templates offers the possibility to build a net of
aligned and ordered nanostructures and the ability to control the
dimensions required (length, diameter and thickness).
Nickel oxide (NiO) is a promising material, extensively used in
catalysis, battery cathodes, gas sensors, electrochromic films and
magnetic applications. There have been several studies in the
fabrication of NiO nanoparticles and thin films, but few discussing the
preparation of high aspect ratio nanowires. In this work we present
recent results on the fabrication and characterization of NiO nanowires
inside nanoporous alumina templates by sol-gel methods and oxidation
processes of Ni nanowires. We studied the influence of sol-gel
parameters such as pH, concentration and time of deposition, and
oxidation parameters such as temperature, time and atmosphere, on the
formation of NiO nanowires and corresponding magnetic properties. The
fabricated samples were characterized by Scanning Electron Microscopy
(SEM), X-Ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM) and
Superconducting Quantum Interference Device (SQUID). |
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