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Open Access Understanding the Role of Sulfur in Tuning the Diameter and Morphology in the Chemical Vapor Deposition Growth of Carbon Nanotubes

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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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Keywords: CARBON NANOTUBES; CVD; ELECTRON MICROSCOPY; GROWTH PROMOTER; RAMAN; SPECTROSCOPY; SULFUR

Document Type: Research Article

Publication date: June 1, 2011

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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