Single-crystalline nanogap electrodes: Enhancing the nanowire-breakdown process with a gaseous environment

Hiroshi Suga, Touru Sumiya, Shigeo Furuta, Ryuichi Ueki, Yosuke Miyazawa, Takuya Nishijima, Jun Ichi Fujita, Kazuhito Tsukagoshi, Tetsuo Shimizu, Yasuhisa Naitoh

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A method for fabricating single-crystalline nanogaps on Si substrates was developed. Polycrystalline Pt nanowires on Si substrates were broken down by current flow under various gaseous environments. The crystal structure of the nanogap electrode was evaluated using scanning electron microscopy and transmission electron microscopy. Nanogap electrodes sandwiched between Pt-large-crystal-grains were obtained by the breakdown of the wire in an O 2 or H 2 atmosphere. These nanogap electrodes show intense spots in the electron diffraction pattern. The diffraction pattern corresponds to Pt (111), indicating that single-crystal grains are grown by the electrical wire breakdown process in an O 2 or H 2 atmosphere. The Pt wires that have (111)-texture and coherent boundaries can be considered ideal as interconnectors for single molecular electronics. The simple method for fabrication of a single-crystalline nanogap is one of the first steps toward standard nanogap electrodes for single molecular instruments and opens the door to future research on physical phenomena in nanospaces.

Original languageEnglish
Pages (from-to)5542-5546
Number of pages5
JournalACS Applied Materials and Interfaces
Volume4
Issue number10
DOIs
Publication statusPublished - 2012 Oct 24
Externally publishedYes

Keywords

  • break junction
  • electro migration
  • nanogap
  • platinum
  • single crystal
  • single molecule electronics

ASJC Scopus subject areas

  • Materials Science(all)

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