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Issue 11, 2013
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Identification of vibrational signatures from short chains of interlinked molecule–nanoparticle junctions obtained by inelastic electron tunnelling spectroscopy

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Abstract

Short chains containing a series of metal–molecule–nanoparticle nanojunctions are a nano-material system with the potential to give electrical signatures close to those from single molecule experiments while enabling us to build portable devices on a chip. Inelastic electron tunnelling spectroscopy (IETS) measurements provide one of the most characteristic electrical signals of single and few molecules. In interlinked molecule–nanoparticle (NP) chains containing typically 5–7 molecules in a chain, the spectrum is expected to be a superposition of the vibrational signatures of individual molecules. We have established a stable and reproducible molecule–AuNP multi-junction by placing a few 1,8-octanedithiol (ODT) molecules onto a versatile and portable nanoparticle–nanoelectrode platform and measured for the first time vibrational molecular signatures at complex and coupled few-molecule–NP junctions. From quantum transport calculations, we model the IETS spectra and identify vibrational modes as well as the number of molecules contributing to the electron transport in the measured spectra.

Graphical abstract: Identification of vibrational signatures from short chains of interlinked molecule–nanoparticle junctions obtained by inelastic electron tunnelling spectroscopy

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Publication details

The article was received on 28 Jan 2013, accepted on 01 Apr 2013 and first published on 08 Apr 2013


Article type: Communication
DOI: 10.1039/C3NR00505D
Citation: Nanoscale, 2013,5, 4673-4677

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    Identification of vibrational signatures from short chains of interlinked molecule–nanoparticle junctions obtained by inelastic electron tunnelling spectroscopy

    S. H. M. Jafri, H. Löfås, J. Fransson, T. Blom, A. Grigoriev, A. Wallner, R. Ahuja, H. Ottosson and K. Leifer, Nanoscale, 2013, 5, 4673
    DOI: 10.1039/C3NR00505D

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