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Applied Physics Letters / Volume 94 / Issue 10 / NANOSCALE SCIENCE AND DESIGN

Appl. Phys. Lett. 94, 103110 (2009); http://dx.doi.org/10.1063/1.3097217 (3 pages)

Vibrational spectra of metal-molecule-metal junctions in electromigrated nanogap electrodes by inelastic electron tunneling

Hyunwook Song1, Youngsang Kim2, Jamin Ku1, Yun Hee Jang1, Heejun Jeong2, and Takhee Lee1

1Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea
2Department of Applied Physics, Hanyang University, Ansan 426-791, Republic of Korea

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(Received 16 September 2008; accepted 13 February 2009; published online 11 March 2009)

We measure the vibrational signatures of metal-molecule-metal junctions formed from 1,8-octanedithiol and 1,4-benzenedithiol incorporated into electromigrated nanogap electrodes using inelastic electron tunneling spectroscopy (IETS). The junction conductance measured suggests that the IETS spectra have been achieved at the individual molecule level. The IETS spectra provide unambiguous experimental evidence of the existence of the component molecules in the fabricated nanogap electrode testbeds. The intense Au–S stretch peaks elucidate that the thiol anchor group is linked to the broken Au wires during electromigration, thus creating reliable electrical contact to individual molecules.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

electrical conductivity, electrical contacts, electrodes, electromigration, MIM structures, organic compounds, silver, tunnelling spectra, vibrational states

PACS

  • 73.40.Rw

    Metal-insulator-metal structures

  • 66.30.Qa

    Electromigration

  • 63.22.-m

    Phonons or vibrational states in low-dimensional structures and nanoscale materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3097217

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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