title: The use of NH3 to promote the production of large-diameter single-walled carbon nanotubes with a narrow (n,m) distribution.
abstract: We demonstrate here a simple and effective (n,m)-selective growth of single-walled carbon nanotubes (SWCNTs) in an aerosol floating catalyst chemical vapor deposition (CVD) process by introducing a certain amount of ammonia (NH(3)). Chiralities of carbon nanotubes produced in the presence of 500 ppm NH(3) at 880 °C are narrowly distributed around the major semiconducting (13,12) nanotube with over 90% of SWCNTs having large chiral angles in the range 20°-30°, and nearly 50% in the range 27°-29°. The developed synthesis process enables chiral-selective growth at high temperature for structurally stable carbon nanotubes with large diameters.
authors.affiliation: NanoMaterials Group, Department of Applied Physics and Center of New Materials, Aalto University, Puumiehenkuja 2, 00076 Aalto, Finland.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhu
authors.forename: Hua
authors.initials: H
authors.lastname: Jiang
authors.forename: Toma
authors.initials: T
authors.lastname: Susi
authors.forename: Albert G
authors.initials: AG
authors.lastname: Nasibulin
authors.forename: Esko I
authors.initials: EI
authors.lastname: Kauppinen