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CNST Seminar Series
Prof. Esko I. Kauppinen
Department of Applied Physics
We discuss (n,m) distributions of our floating catalyst chemical vapor deposition (FFCVD) synthesis of SWCNTs from CO using Fe catalyst clusters made via direct evaporation using hot wire generator as well as via thermal decomposition of ferrocene, and with the addition of trace amount of CO2. Here both the tube diameter as well as length can be tailored by changing the reactor temperature profile as well as CO2 concentration. Helicity, i.e., (n,m) distributions as determined with ED/TEM are biased towards large chiral angles with the maximum population at about 23 degrees. Then we proceed to explore the effect of carbon source gas, by adding C2H4 together with CO and looking at the effect of temperature when producing catalysts via ferrocene decomposition. We also discuss Cs-corrected HRTEM results to explore the size and structure of the active Fe catalyst particles responsible for the SWNT growth.
Start Date: Thursday, April 17, 2014 05:03 PM
End Date: Thursday, April 17, 2014 05:03 PM
Location: 1:30PM, Bldg 217, Rm H107
Renu Sharma, 301-975-2418