Investigating the Catalytic Growth of Carbon Nanotubes with In Situ Raman Monitoring
Final rept. 1 Apr 2012-31 Mar 2015
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE MONTPELLIER (FRANCE) LAB DE SCIENCE DES MATERIAUX VITREUX
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The objectives of this project were to identify the processes responsible for growth termination, creation and healing of defects, and chiral selectivity of single-walled carbon nanotubes, in order to develop strategies to increase nanotube length, improve the structural quality of samples, and improve the metallic semiconducting ratio of samples. Using in situ Raman measurements and scanning electron microscopy, we showed that reaction of the catalyst with support to form more refractor compounts can increase growth selectivity, showed that catalyst ripening, nanotube nucleation, and catalyst encapsulation can affect diameter and chirality, and showed that exposure to oxygen may be causing defects in growth.
- Refractory Fibers