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Double-walled carbon nanotubes: synthesis, structural characterization, and application
Kim, Yoong Ahm,Yang, Kap-Seung,Muramatsu, Hiroyuki,Hayashi, Takuya,Endo, Morinobu,Terrones, Mauricio,Dresselhaus, Mildred S. 한국탄소학회 2014 Carbon Letters Vol.15 No.2
Double walled carbon nanotubes (DWCNTs) are considered an ideal model for studying the coupling interactions between different concentric shells in multi-walled CNTs. Due to their intrinsic coaxial structures they are mechanically, thermally, and structurally more stable than single walled CNTs. Geometrically, owing to the buffer-like function of the outer tubes in DWCNTs, the inner tubes exhibit exciting transport and optical properties that lend them promise in the fabrication of field-effect transistors, stable field emitters, and lithium ion batteries. In addition, by utilizing the outer tube chemistry, DWCNTs can be useful for anchoring semiconducting quantum dots and also as effective multifunctional fillers in producing tough, conductive transparent polymer films. The inner tubes meanwhile preserve their excitonic transitions. This article reviews the synthesis of DWCNTs, their electronic structure, transport, and mechanical properties, and their potential uses.
Kim, Yoong Ahm,Aoki, Shunta,Fujisawa, Kazunori,Ko, Yong-Il,Yang, Kap-Seung,Yang, Cheol-Min,Jung, Yong Chae,Hayashi, Takuya,Endo, Morinobu,Terrones, Mauricio,Dresselhaus, Mildred S. American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.8
<P>Carbon nanotubes have shown great potential as conductive fillers in various composites, macro-assembled fibers, and transparent conductive films due to their superior electrical conductivity. Here, we present an effective defect engineering strategy for improving the intrinsic electrical conductivity of nanotube assemblies by thermally incorporating a large number of boron atoms into substitutional positions within the hexagonal framework of the tubes. It was confirmed that the defects introduced after vacuum ultraviolet and nitrogen plasma treatments facilitate the incorporation of a large number of boron atoms (ca. 0.496 atomic %) occupying the trigonal sites on the tube sidewalls during the boron doping process, thus eventually increasing the electrical conductivity of the carbon nanotube film. Our approach provides a potential solution for the industrial use of macro-structured nanotube assemblies, where properties, such as high electrical conductance, high transparency, and lightweight, are extremely important.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-8/jp410732r/production/images/medium/jp-2013-10732r_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp410732r'>ACS Electronic Supporting Info</A></P>