Co-catalytic
Absorption Layers for Controlled
Laser-Induced Chemical Vapor Deposition of Carbon Nanotubes
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Abstract
The concept of co-catalytic layer
structures for controlled laser-induced chemical vapor deposition
of carbon nanotubes is established, in which a thin Ta support layer
chemically aids the initial Fe catalyst reduction. This enables a
significant reduction in laser power, preventing detrimental positive
optical feedback and allowing improved growth control. Systematic
study of experimental parameters combined with simple thermostatic
modeling establishes general guidelines for the effective design of
such catalyst/absorption layer combinations. Local growth of vertically
aligned carbon nanotube forests directly on flexible polyimide substrates
is demonstrated, opening up new routes for nanodevice design and fabrication