Thermal Chemical Vapor Deposition of Carbon Nanotubes
Multiwalled Nanotubes - Tip Growth Model
Thermal Chemical Vapor Deposition: The growth species
is generated by dissociative adsorption of hydrocarbon on catalyst surface.
Nanotubes are formed via the Vapor-Liquid-Solid (VLS) mechanism.
Substrate with catalyst thin film
Substrate pretreatment induces formation of nanoparticle catalyst
Catalyst surface melting on a high temperature substrate. We propose
a solid core model.
Adsorption of hydrocarbon molecules (C
2H 2 in this case) on the catalyst
surface. Dissociation of H atoms from the hydrocarbon molecules (dissociative
Diffusion of carbon into the catalyst and readsorption of the hydrocarbon
on the catalyst surface.
Saturation of carbon in catalyst particle.
Segregation of carbon to form carbon nanotubes.
No segregation directly under the core. A hollow nanotube is formed.
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Win About This Animation
Dr. Yoke Khin Yap
Department of Physics, Michigan Technological University
Dr. Susan E. Hill Animation Usage
MTU Open House 2004-2005
Demonstrations by Dr. Yoke Khin Yap in the Materials Physics
and Laser Physics Laboratory were given for visiting high school
students and their families during the fall 2005 and 2006 MTU Open House
departmental tours. The animation was shown on
the lab computer to over 50 families each time.
Fundamentals of Nanoscale Science and Engineering - Spring 2004
"Carbon Nanotubes: Growth, Properties, Applications and Challenges"
The March 15, 2004 lecture was presented by Dr. Yoke Khin Yap for undergraduate
students of various majors at Michigan Tech.
ENG 1101 Exploration:
Exploring Nanoscale Science & Technology Through Carbon Nanotubes
Demonstrations by Dr. Yoke Khin Yap in the Materials Physics and Laser
Physics Laboratory were given for Engineering Exploration undergraduate
students at Michigan Tech. The animation was shown to the student
group on the lab computer for explorations on September 24 and October
1, 2003, and March 10, October 19, and October 28, 2004. Used in the
Multimedia Gallery for the MTU Physics Yap Group.
© 2004 Michigan Technological University