Single-walled carbon nanotubes directly-grown from orientated carbon nanorings

  • Tojo, Tomohiro (Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology) ;
  • Inada, Ryoji (Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology) ;
  • Sakurai, Yoji (Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology) ;
  • Kim, Yoong Ahm (Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering & Alan G. MacDiarmid Energy Research Institute, Chonnam National University)
  • Received : 2017.11.28
  • Accepted : 2018.01.17
  • Published : 2018.07.31


Surfactant-wrapped separation methods of metallic and semiconducting single-walled carbon nanotubes (SWCNTs) can result in large changes in intrinsic physical and chemical properties due to electronic interactions between a nanotube and a surfactant. Our approach to synthesize SWCNTs with an electronic feature relied on utilizing carbon nanorings, [n] cycloparaphenylenes ([n]CPPs), which are the fundamental unit of armchair type SWCNTs (a-SWCNTs) that possess a metallic feature without any surfactants. To obtain long tubular structures from [n]CPPs, the host-guest complexes formed with well-aligned [n]CPP hosts and various fullerene guests on a silicon substrate were pyrolyzed under an ethanol gas flow at a high temperature with focused-ultraviolet laser irradiation. The pyrolyzed [n]CPPs were observed to transform from nanorings to tubular structures with 1.5-1.7 nm diameters corresponding to the employed diameter of [n]CPPs. Our approach suggests that [n]CPPs are useful for structure-controlled synthesis of SWCNTs.



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