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STM/STS study on the ground state of layered dichalcogenide nanotubes

Research Project

Project/Area Number 17540308
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionHokkaido University

Principal Investigator

ICHIMURA Koichi  Hokkaido University, Faculty of Science, Instructor, 大学院教育学研究科, 助手 (50261277)

Co-Investigator(Kenkyū-buntansha) MATSUNAGA Noriaki  Hokkaido University, Faculty of Science, Lecturer, 大学院教育学研究科, 講師 (10222308)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordslayered material / nanotube / STM / STS
Research Abstract

Layered compound NbSe_2 nanotubes were studied by low temperature scanning tunneling microscope (STM). NbSe_2 nanotube is an interesting material since it is the first nanotube material, of which bulk phase undergoes the condensed state such as the density wave and superconductivity. NbSe_2 nanotubes were synthesized by the chemical vapor transport method. The nanotube sample for STM measurement was prepared by dropping NbSe_2 nanotubes agitated ultrasonically in 2-propanol on cleaved highly oriented pyrolytic graphite (HOPG).
Topographic STM images of NbSe_2 nanotubes on the substrate of HOPG were taken at room temperature. The length of nanotubes is estimated as 300-2000 nm. Almost NbSe_2 nanotube has length over 600 nm. The nanotube structure is confirmed by STM scan profiles. Diameter of nanotubes is estimated as 2-50 nm, which is much smaller than that of multi-walled nanotubes studied by transmission electron microscope. We think that nanotubes with diameter of less than 10 nm are single-walled one. We are interested in the relation between the chirality (helicity) and electronic structure in single-walled NbSe_2 nanotubes. The bundle structure, which is popular in single-walled carbon nanotube, is found in NbSe_2 nanotubes. The bundle consists of about hundred nanotubes. The Y-junction, which is the connected structure with three nanotubes, is also found similarly to carbon nanotubes.
Although we can not take STM image with atomic resolution at room temperature, clear images with atomic arrangement are obtained below 4.2 K. The chirality of NbSe_2 nanotube is successfully determined from these images. The chiral index is found to vary from sample to sample. We also find that all nanotubes, of which atomic arrangement is determined, are so-called chiral type with low symmetry in helicity. It might give some suggestion to growing mechanism of NbSe_2 nanotubes.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (19 results)

All 2006 2005

All Journal Article (19 results)

  • [Journal Article] Role of the Dimerized Gap due to Anion Ordering in the Quantized Hall Phases of Quasi-One Dimensional Organic Conductors2006

    • Author(s)
      N.Matsunaga et al.
    • Journal Title

      Journal of Low Temperature Physics 142

      Pages: 477-480

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] STM/STS on NbSe_2 Nanotubes2006

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Proceedings of the 1st International Symposium on Topological Science and Technology (TOP2005)

      Pages: 135-140

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Scanning Tunneling Spectroscopy on Organic Superconductors2006

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Japanese Journal of Applied Physics 45

      Pages: 2264-5567

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] d-wave Pair Symmetry in the Superconductivity of κ-(BEDT-TTF)_2X2006

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Journal of the Physical Society of Japan 75

    • NAID

      110004702302

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Tunneling Spectroscopy on Partially Deuterated κ-(BEDT-TTF)_2Cu[N(CN)_2]Br by STM2006

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      AIP Conference Proceedings 850

      Pages: 607-608

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] d-wave Pair Symmetry in the Superconductivity of K-(BEDT-TTF)_2X2006

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Journal of the Physical Society of Japan 75

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Tunneling Spectroscopy on Partially Deuterated K-(BEDT-TTF)_2Cu[N(CN)_2]Br by STM2006

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      AIP Conference Proceedings 850

      Pages: 607-608

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] STM/STS on NbSe_2 Nanotubes2006

    • Author(s)
      K.Ichimura, et al.
    • Journal Title

      Proceedings of the 1st International Symposium on Topological Science and Technology (TOP2005)

      Pages: 135-140

    • Related Report
      2006 Annual Research Report
  • [Journal Article] d-wave Pair Symmetry in the Superconductivity of κ-(BEDT-TTF)_2X2006

    • Author(s)
      K.Ichimura, et al.
    • Journal Title

      Journal of the Physical Society of Japan 75

    • NAID

      110004702302

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Tunneling Spectroscopy on Partially Deuterated κ-(BEDT-TTF)_2Cu[N(CN)_2]Br by STM2006

    • Author(s)
      K.Ichimura, et al.
    • Journal Title

      AIP Conference Proceedings 850

      Pages: 607-608

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Scanning Tunneling Spectroscopy on Organic Superconductors2006

    • Author(s)
      K.Ichimura, et al.
    • Journal Title

      Japanese Journal of Applied Physics 45

      Pages: 2264-2267

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Role of the Dimerized Gap due to Anion Ordering in the Quantized Hall Phases of Quasi-One Dimensional Organic Conductors2006

    • Author(s)
      N.Matsunaga, et al.
    • Journal Title

      Journal of Low Temperature Physics 142

      Pages: 473-476

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Scanning Tunneling Spectroscopy on κ-(BEDT-TTF)_2Cu[N(CN)_2]Br2005

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Synthetic Metals 153

      Pages: 409-412

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Non-Linear Transport in the Incommensurate SDW Phase of (TMTTF)_2Br under Pressure2005

    • Author(s)
      K.Nomura et al.
    • Journal Title

      Synthetic Metals 153

      Pages: 433-436

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Nonlinear Electric Conduction in the Charge Ordering State of (TMTTF)_2SbF_62005

    • Author(s)
      M.Nagasawa et al.
    • Journal Title

      Journal de Physique IV 131

      Pages: 107-110

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Depinning of the Spin-Density-Wave in (TMTTF)_2Br under Pressure2005

    • Author(s)
      K.Nomura et al.
    • Journal Title

      Journal de Physique IV 131

      Pages: 111-114

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Imaging of NbSe_2 Nanotube by STM2005

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Journal de Physique IV 131

      Pages: 235-237

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Effect of the Dimerized Gap due to Anion Ordering in the Field-Induced Spin-Density-Wave of Quasi-One Dimensional Organic Conductors2005

    • Author(s)
      N.Matsunaga et al.
    • Journal Title

      Journal de Physique IV 131

      Pages: 269-272

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Scanning Tunneling Spectroscopy on K-(BEDT-TTF)_2Cu[N(CN)_2]Br2005

    • Author(s)
      K.Ichimura et al.
    • Journal Title

      Synthetic Metals 153

      Pages: 409-412

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2005-04-01   Modified: 2020-05-15  

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