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2003 Fiscal Year Final Research Report Summary

Measurement of single-molecular conductivity

Research Project

Project/Area Number 13450023
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 表面界面物性
Research InstitutionOsaka University

Principal Investigator

MATSUMOTO Takuya  MATSUMOTO,Takuya, 産業科学研究所, 助教授 (50229556)

Co-Investigator(Kenkyū-buntansha) TANAKA Hidekazu  TANAKA,Hidekazu, 産業科学研究所, 助教授 (80294130)
Project Period (FY) 2001 – 2003
KeywordsConductivity of single molecule / Non-contact atomic force microscopy / Scanning tunneling microscopy / Point-contact current-imaging atomic force microscopy / Charge transfer microscopy / Carbon nano-tube / Porphyrin array / DNA
Research Abstract

Molecular electronics has attracted much attention in the last quarter-century. Investigations on the electronic properties and functions of molecular systems have made remarkable advances since the invention of scanning tunneling microscopy (STM). However, STM measurement is inadequate for the device structure consisting of conductive and insulating parts due to the requirement of conductivity for all over the scanning area. In this study, novel methods of scanning probe microscopy based on atomic force microscopy (AFM). These methods enable us to evaluate electronic properties of molecular nanostructures located on insulating substrates and/or connected with metal electrodes.
1.Non-contact atomic force microscopy (NC-AFM) has been employed to observe double-stranded DNA. The simultaneous measurements of frequency-shift and tunneling current indicate that DNA molecules show tunneling conductivity with the. attenuation factor β=1.1Å^<-1>.
2.Point-contact current-imaging atomic force micr … More oscopy (PCI-AFM) enables us to obtain topographic images and current-voltage characteristics simultaneously in nanoscale. PCI-AFM is a combined method with two different measurement techniques : tapping-mode scan and point-contact measurement. This new technique will be a good approach to obtain the relationship between topography and electrical properties of individual nanoscale structures.
3.Charge transfer force microscopy/ spectroscopy (CTFM/S) detects the energy dissipation of cantilever oscillation with constant tip-sample distance under bias voltage. It enables us to obtain a map of density of states (DOS) and DOS spectra in manometer-scale resolution for the surface consisting of insulating and conductive parts. CTFM images and CTFS spectra are obtained by probing frequency shift of cantilever oscillation. Figure 1 shows CTFS spectra as a function of bias voltage for 5, 10, 15, 20-tetraphenyl-21H, 23H-porphine tetrasulfonic acid (TPPS). HOMO-LUMO gap (1.7eV) is observed clearly on an insulating substrate. Less

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Yasushi Maeda, Hidehiro Nishijima, Seiji Akita, Takuya Matsumoto, Yoshikazu Nakayama, Tomoji Kawai: "Reduction of Long-range Interaction using Carbon Nanotube Probes in Biological Systems."Jpn.J.Appl.Phys.. 40. 1425-1428 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai: "A Nano tester : A new technique for nanoscale electrical characterization by point-contact current-imaging atomic force microscopy."Jpn.J.Appl.Phys.. 41. L742-L744 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai: "Point-contact current-imaging atomic force microscopy : Measurement of contact resistance between single-walled carbon nanotubes."Appl.Phys.Lett. 82. 1944-1946 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Katsunori Tagami, Masaru Tsukada, Takuya Matsumoto, Tomoji Kawai: "Electronic transport properties of free-base tape-porphyrin molecular wires studied by self-consistent tight-binding calculations."Phys.Rev.B. 67. 245324(1)-245324(7) (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Katsunori Tagami, Takuya Matsumoto, Tomoji Kawai, Masaru Tsukada: "Theoretical prescriptions for improving conductance of short DNA segments sandwiched between metal electrode."Jpn.J.Appl.Phys.. 42. 5887-5891 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Akihiko Takagi, Yoshiki Yanagawa, Akihiko Tsuda, Naoki Aratani, Takuya Matsumoto, Atsuhiro Osuka, Tomoji Kawai: "STM imaging of individual porphyrin hexamers ; meso-meso slingly linked orthogonal hexamer and meso-meso, β-β, β-β tiply-linked planear hexamer on Cu(100) surface."Chem.Commun.. 24. 2986-2987 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松重和美, 田中一義 編 (分担:松本卓也, 川合知二): "化学フロンティア6「分子ナノテクノロジー」SPMによるナノ物質の電気伝導度測定"化学同人. 12(53-64) (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yasushi Maeda, Hidehiro Nishijima, Seiji Akita, Takuya Matsumoto, Yoshikazu Nakayarna, Tornoji Kawai: "Reduction of Long-range Interaction using Carbon Nanotube Probes in Biological Systems."Jpn. J. Appl. Phys.. 40. 1425-1428 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai: "A Nano tester: A new technique for nanoscale electrical characterization by point-contact can ent-imaging atomic force microscopy."Jpn.J.Appl.Phys.. 41. L742-L744 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoichi Otsuka, Yasuhisa Naitoh, Takuya Matsumoto, Tomoji Kawai: "Point-contact current-imaging atomic force microscopy : Measurement of contact resistance between single-walled carbon nanotubes."Appl.Phys.Lett.. 82. 1944-1946 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Katsunori Tagami, Masaru Tsukada, Takuya Matsumoto, Tomoji Kawai: "Electronic transport properties of free-base tape-porphyrin molecular wires studied by self-consistent tight-binding calculations."Phys.Rev.B.. 67. 245324(1)-245324-(7)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Katsunori Tagami, Takuya Matsumoto, Tomoji Kawai, Tasaru Tsukada: "Theoretical prescriptions for improving conductance of short DNA segments sandwiched between metal electrode."Jpn.J.Appl.Phys.. 42. 5887-5891 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Akihiko Takagi, Yoshiki Yanagawa, Akihiko Tsuda, Naoki Aratani, Takuya Matsumoto, Atsuhiro Osuka, Tomoji Kawai: "STM imaging of individual porphyrin hexamers; meso-meso slingly linked orthogonal hexamer and meso-meso,β-β,β-β tiply-linked planear hexamer on Cu(100) surface."Chem.Commun.. 24. 2986-287 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takuya Matsuroto, Tomoji Kawai: "Electric conductity measur ment. of nano-scale materials by SPM"Kagaku Dojin,Series of Chemistry Frontior 6, (eds. Kazumi Matsushige, Kazuyoshi Tanaka) (Kyoto). 53-64 (2002)

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      「研究成果報告書概要(欧文)」より

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Published: 2005-04-19  

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