title: Effects of the Fe-Co interaction on the growth of multiwall carbon nanotubes.
abstract: The influences of active species Fe-Co composition on the growth of carbon nanotubes (CNTs) were systemically investigated. CNTs were grown from the pyrolytic decomposition of C(2)H(2) over Fe-Co/CaCO(3) catalysts by radio frequency chemical vapor deposition (CVD). The catalyst stoichiometry was found to strongly influence the carbon deposition rate as well as the nanotube crystallinity characteristics. Compared to the CNTs synthesized over the Co/CaCO(3) catalyst, those produced by Fe-containing catalysts have less amorphous carbon. The maximum yield of high-quality CNTs was achieved at the Fe/Co atomic ratio of 2:1 due to a suitable concentration of benzene generated from acetylene CVD on such catalytic system. Fe and Co can form alloy and therefore the d-electron interaction between Fe and Co was believed to play an important role in the CNT growth.
authors.affiliation: Nanotechnology Center and Graduate Institute of Technology, University of Arkansas at Little Rock, Arkansas 72204, USA. zxli3@ualr.edu
authors.forename: Zhongrui
authors.initials: Z
authors.lastname: Li
authors.forename: Enkeleda
authors.initials: E
authors.lastname: Dervishi
authors.forename: Yang
authors.initials: Y
authors.lastname: Xu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Ma
authors.forename: Viney
authors.initials: V
authors.lastname: Saini
authors.forename: Alexandru S
authors.initials: AS
authors.lastname: Biris
authors.forename: Reginald
authors.initials: R
authors.lastname: Little
authors.forename: Alexandru R
authors.initials: AR
authors.lastname: Biris
authors.forename: Dan
authors.initials: D
authors.lastname: Lupu
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D037742:Nanotubes, Carbon; D003035:Cobalt; D007501:Iron; D002119:Calcium Carbonate