Understanding the Role of Sulfur in Tuning the Diameter and Morphology in the Chemical Vapor Deposition Growth of Carbon Nanotubes
A floating catalyst thermal CVD process using ferrocene and sulfur delivered in varying weight ratios of iron to sulfur (3/1, 5/1 and 10/1) was used to prepare carbon nanotubes (CNTs). Energy-filtered transmission electron microscopy indicated the segregation of sulfur to the surface of the iron nanoparticles and the formation of an iron/sulfur boundary, which promoted the nanotube growth. The average catalyst particle size was observed to decrease with decreasing sulfur content (10/1), which reflected in a reduction in the number of walls (from multiple to single) of the CNTs produced. The growth process described here represents a facile and scalable method to tune the diameter and wall-structure of CNTs by changing the concentration of sulfur with respect to iron.
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Document Type: Research Article
Publication date: June 1, 2011
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