title: Electronic structure and field emission of multiwalled carbon nanotubes depending on growth temperature.
abstract: The electronic structure of multiwalled carbon nanotubes (CNTs) has been investigated, depending on the growth temperature, using synchrotron X-ray photoelectron spectroscopy (XPS) and field emission measurements. The vertically aligned CNTs are grown via pyrolysis of ferrocene and acetylene in a broad temperature range 600-1000 degrees C. The CNTs have a cylindrical structure with a uniform diameter of 20 nm. As growth temperature increases, due to an improved crystallinity of the graphitic sheets, the width of the XPS C 1s peak becomes narrower and the intensity of the valence band increases. Field emission from the as-grown CNTs exhibits a large enhancement of current density with growth temperature, strongly correlated with the electronic structure revealed by XPS.
authors.affiliation: Department of Chemistry, Korea University, Jochiwon 339-700, Korea.
authors.forename: Sang Won
authors.initials: SW
authors.lastname: Yoon
authors.forename: Shin Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Jeunghee
authors.initials: J
authors.lastname: Park
authors.forename: Chan Jun
authors.initials: CJ
authors.lastname: Park
authors.forename: Cheol Jin
authors.initials: CJ
authors.lastname: Lee
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004581:Electronics; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D013059:Spectrum Analysis, Raman; D013816:Thermodynamics
chemical_list: D002244:Carbon