title: Growth of double-walled carbon nanotubes using a conditioning catalyst.
abstract: Here we describe the effect of different synthetic conditions on the quality and purity of double-walled carbon nanotubes (DWNTs) with the aid of a conditioning catalyst. By lowering the reaction temperature down to 875 degrees C and utilizing a conditioning catalyst, increased purity and a decreased inner diameter of the DWNTs was achieved, while adverse results were observed with increasing reaction temperature. Based on detailed high-resolution transmission electron microscopy studies on the diameter distribution of the tubes, preferential growth conditions for DWNTs over single-wall carbon nanotubes are identified solely from increased carbon solubility considerations (caused by an increased portion of active carbon species by use of Mo) for the same distribution of metal particles.
authors.affiliation: Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-8553, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Muramatsu
authors.forename: T
authors.initials: T
authors.lastname: Hayashi
authors.forename: Y A
authors.initials: YA
authors.lastname: Kim
authors.forename: M
authors.initials: M
authors.lastname: Endo
authors.forename: M
authors.initials: M
authors.lastname: Terrones
authors.forename: M S
authors.initials: MS
authors.lastname: Dresselhaus
mesh_terms: D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D006358:Hot Temperature; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D037742:Nanotubes, Carbon