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Winter 2008 Seminar Series
Friday, Februrary 1, at 3:30 p.m.
Room 264 MacQuigg Labs
Huyong Lee
PhD Candidate
Advisor: Dr. Sheikh Akbar
The Ohio State University
Fabrication of 1-D Nanostructures by Gas-Phase Reaction
Abstract
1-D nanostructures such as nanowires, nanorods and nanobelts have lately drawn much attention both for fundamental studies as well as applications. Recently, simple and inexpensive ways to produce 1-D nanostructures on a large area in a single-step process has been developed on various substrates such as pure Ti metal and Ti metal alloys and TiO2 coated Ti64 alloy. From various characterizations, 1-D nanostructures are determined to have the length of nanowires ranging from 2 to 20 µm and diameter of less than 500 nm. The growth of the nanowire is controlled by the diffusion of Ti along the length of the fiber that gets oxidized at the tip. This is consistent with the fact that the vapor pressure of Ti at the heat treatment temperature of 700 °C is so low that the common VLS mechanism is not applicable.
One of the most interesting applications of these nanowires is in the area of biomedical applications because the nanowires can provide much higher surface area to interact with body fluid than commonly fabricated biomedical implants. Our preliminary tests for Ca growth on Ti64 alloy with nanowires show promising results for biomedical applications such as dental implant and bone joint implants.
Bio
Huyong was born in Korea and received his B.S. degree at Korea University in Seoul, Korea. He joined the Department in 2000 and received his M.S. degree in 2004. Since he joined Dr. Akbarês group, he has been working on the fabrication of 1-D nanostructures by gas-phase reaction and their possible applications in chemical sensing and biological cell attachment/growth.
