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Published on: December 6, 2021
Increasing the efficiency of single walled carbon nanotube amplification by Fe-Co catalysts through the optimization
Alvin W Orbaek1, Andrew C Owens, Andrew R Barron
1Richard E. Smalley Institute for Nanoscale Science and Technology, Department of Chemistry, Rice University, Houston, Texas 77005, United States.
Abstract:
Single walled carbon nanotubes (SWNTs) seeds are grown using Fe-Co nanoparticles on spin-on-glass. The relative efficiency of nucleation and amplification (versus etching) was investigated as a function of the CH(4)/H(2) feedstock ratio and growth temperature. At 900 °C, maximum amplification is obtained with CH(4)/H(2) ratio of 80:20 but 60:40 for nucleation. Amplification is further enhanced at 800 °C, compared with etching dominating at 1000 °C. Amplification of SWNTs is in equilibrium with etching; higher carbon feedstock pressure and decreased temperature increase the rate of amplification; the converse increases etching.
