title: Multi-Directional Growth of Aligned Carbon Nanotubes Over Catalyst Film Prepared by Atomic Layer Deposition.
abstract: The structure of vertically aligned carbon nanotubes (CNTs) severely depends on the properties of pre-prepared catalyst films. Aiming for the preparation of precisely controlled catalyst film, atomic layer deposition (ALD) was employed to deposit uniform Fe(2)O(3) film for the growth of CNT arrays on planar substrate surfaces as well as the curved ones. Iron acetylacetonate and ozone were introduced into the reactor alternately as precursors to realize the formation of catalyst films. By varying the deposition cycles, uniform and smooth Fe(2)O(3) catalyst films with different thicknesses were obtained on Si/SiO(2) substrate, which supported the growth of highly oriented few-walled CNT arrays. Utilizing the advantage of ALD process in coating non-planar surfaces, uniform catalyst films can also be successfully deposited onto quartz fibers. Aligned few-walled CNTs can be grafted on the quartz fibers, and they self-organized into a leaf-shaped structure due to the curved surface morphology. The growth of aligned CNTs on non-planar surfaces holds promise in constructing hierarchical CNT architectures in future.
  
  
  BACKGROUND
  The online version of this article (doi:10.1007/s11671-010-9676-0) contains supplementary material, which is available to authorized users.
authors.affiliation: Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhou
authors.forename: Jia-Qi
authors.initials: JQ
authors.lastname: Huang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Fei
authors.initials: F
authors.lastname: Wei