@article {Rao:2011:2158-5849:160,
title = "Understanding the Role of Sulfur in Tuning the Diameter and Morphology in the Chemical Vapor Deposition Growth of Carbon Nanotubes",
journal = "Materials Express",
parent_itemid = "infobike://asp/me",
publishercode ="asp",
year = "2011",
volume = "1",
number = "2",
publication date ="2011-06-01T00:00:00",
pages = "160-166",
itemtype = "ARTICLE",
issn = "2158-5849",
url = "https://www.ingentaconnect.com/content/asp/me/2011/00000001/00000002/art00007",
doi = "doi:10.1166/mex.2011.1019",
keyword = "SPECTROSCOPY, RAMAN, CARBON NANOTUBES, GROWTH PROMOTER, ELECTRON MICROSCOPY, CVD, SULFUR",
author = "Rao, Rahul and Pierce, Neal and Zhang, Xianfeng and Wheeler, Robert and Maruyama, Benji and Talapatra, Saikat",
abstract = "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.",
}