Web Release Date: February 23,
Magnetic and Thermal Expansion Properties of Vertically Aligned Fe Nanotubes Fabricated by Electrochemical Method
and
School of Electrical and Electronics Engineering, Nanyang Technological University, Block S2, Nanyang Avenue, Singapore 639798, Singapore, Advanced Materials for Micro- and Nano-Systems, Singapore-MIT Alliance, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore, and School of Physical and Mathematical Sciences, Nanyang Technological University, 1 Nanyang Walk, Block 5, Singapore 637616, Singapore
Received: December 10, 2007
In Final Form: December 30, 2007
Abstract:
A simple electrochemical method, which involves the use of anodic alumina membranes (AAMs) as the template, was used to synthesize vertically aligned Fe nanotubes. It is shown that the thickness of the Au cathode electrode on the AAM and the use of a direct electrodeposition technique are the two key factors to realize Fe nanotubes. It is noted that the wall thickness of the Fe nanotubes can be preciously controlled by the deposition time and the nanotubes can change to nanowires as the deposition time prolongs. Magnetic and thermal expansion properties of both Fe nanotubes and nanowires are studied and compared. It is found that the Fe nanotubes have a large coercive force and are physically robust to the change in temperature as compared with Fe nanowires.
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