tailieunhanh - Báo cáo hóa học: " Multi-Directional Growth of Aligned Carbon Nanotubes Over Catalyst Film Prepared by Atomic Layer Deposition"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Multi-Directional Growth of Aligned Carbon Nanotubes Over Catalyst Film Prepared by Atomic Layer Deposition | Nanoscale Res Lett 2010 5 1555-1560 DOI s11671-010-9676-0 NANO EXPRESS Multi-Directional Growth of Aligned Carbon Nanotubes Over Catalyst Film Prepared by Atomic Layer Deposition Kai Zhou Jia-Qi Huang Qiang Zhang Fei Wei Received 18 May 2010 Accepted 12 June 2010 Published online 23 June 2010 The Author s 2010. This article is published with open access at 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 Fe2O3 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 Fe2O3 catalyst films with different thicknesses were obtained on Si SiO2 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. Keywords Aligned carbon nanotubes Atomic layer deposition Chemical vapor deposition Catalysis Nanotechnology Electronic supplementary material The online version of this article doi s11671-010-9676-0 contains supplementary material which is available to authorized users. K. Zhou . Huang Q. Zhang F. Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University 100084 Beijing China e-mail wf-dce@ .