Origin of Discrepancies in Inelastic Electron Tunneling Spectra of Molecular Junctions

Details Origin of Discrepancies in Inelastic Electron Tunneling Spectra of Molecular Junctions Origin of Discrepancies in Inelastic Electron Tunneling Spectra of Molecular Junctions

2007-04-13

arxiv.org/abs/0704.1775v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.98.206803

We report inelastic electron tunneling spectroscopy (IETS) of multilayer molecular junctions with and without incorporated metal nano-particles. The incorporation of metal nanoparticles into our devices leads to enhanced IET intensity and a modified line-shape for some vibrational modes. The enhancement and line-shape modification are both the result of a low lying hybrid metal nanoparticle-molecule electronic level. These observations explain the apparent discrepancy between earlier IETS measurements of alkane thiolate junctions by Kushmerick \emph{et al.} [Nano Lett. \textbf{4}, 639 (2004)] and Wang \emph{et al.} [Nano Lett. \textbf{4}, 643 (2004)].

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