Evolution of catalyst particle size during carbon single walled nanotube growth and its effect on the tube characteristics
- Honda Research Institute USA Inc., 1381 Kinnear Road, Columbus, Ohio 43212 (United States)
A series of Fe catalysts, with different mean diameters, supported on alumina with different molar ratios, was studied before and after carbon single walled nanotubes growth using magnetic measurements and Raman scattering techniques (laser excitation wavelengths from 1.17 to 2.54 eV) to follow changes on catalyst particle size and composition, as well as the relationship between particle size and diameter of nanotubes grown. In all cases, an increase and redistribution of the particle size after the growth was concluded based on the blocking temperature values and Langevin function analysis. This is explained in terms of agglomeration of particles due to carbon-induced liquefaction accompanied with an increase in the catalyst mobility. For large particles no direct correlation between the catalyst size and the nanotube diameters was observed.
- OSTI ID:
- 20880022
- Journal Information:
- Journal of Applied Physics, Vol. 100, Issue 4; Other Information: DOI: 10.1063/1.2335396; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Growth of single and double walled carbon nanotubes over Co/V/MgO catalysts
Size control of catalytic nanoparticles by thermal treatment and its application to diameter control of single-walled carbon nanotubes