Identifying molecular signatures in metal-molecule-metal junctions

Nanoscale
Makusu TsutsuiTomoji Kawai

Abstract

Single molecule identification in metal-molecule-metal junctions provides an ultimate probe that opens a new avenue for revolutionary advances in demonstrating single molecule device functions. Inelastic electron tunneling spectroscopy (IETS) is an ultra-sensitive method for probing vibrational characteristics of molecules with atomic resolution. State-of-the-art experiments on the inelastic transport in self-assembled monolayers of organic molecules have demonstrated the utility of the IETS technique to derive structural information concerning molecular conformations and contact configurations. Here we report the vibrational fingerprint of an individual pi-conjugated molecule sandwiched between gold nanoelectrodes. Our strategy combines analyses of single molecule conductance and vibrational spectra exploiting the nanofabricated mechanically-controllable break junction. We performed IETS measurements on 1,4-benzenedithiol and 2,5-dimercapto-1,3,4-thiadiazole to examine chemical discrimination at the single-molecule level. We found distinct IET spectra unique to the test molecules that agreed excellently with the Raman and theoretical spectra in the fingerprint region, and thereby succeeded in electrical identification of singl...Continue Reading

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Citations

Apr 13, 2013·Bioconjugate Chemistry·Ouafâa El-Mahdi, Oleg Melnyk
Jun 24, 2011·Physical Chemistry Chemical Physics : PCCP·Jeppe FockHerre van der Zant
Sep 13, 2012·Sensors·Makusu Tsutsui, Masateru Taniguchi
Jan 3, 2014·Physical Chemistry Chemical Physics : PCCP·Yan-Yan SunBing-Wei Mao
Oct 28, 2014·Nanoscale·Amaury de Melo SouzaStefano Sanvito
Mar 17, 2016·Chemical Reviews·Dong XiangXuefeng Guo
Aug 6, 2013·Advanced Materials·Dong XiangDirk Mayer
Jan 24, 2015·Physical Chemistry Chemical Physics : PCCP·Alberto TorresAdalberto Fazzio
May 8, 2019·Physical Chemistry Chemical Physics : PCCP·Masateru Taniguchi
Jan 16, 2019·Analytical Chemistry·Nungnit WattanavicheanHeike Arnolds

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