Document Detail

Identifying molecular signatures in metal-molecule-metal junctions.
MedLine Citation:
PMID:  20644876     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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 single molecule junctions.
Makusu Tsutsui; Masateru Taniguchi; Kohei Shoji; Kazumichi Yokota; Tomoji Kawai
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Publication Detail:
Type:  Journal Article     Date:  2009-09-02
Journal Detail:
Title:  Nanoscale     Volume:  1     ISSN:  2040-3372     ISO Abbreviation:  Nanoscale     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2010-07-20     Completed Date:  2010-10-28     Revised Date:  2011-06-22    
Medline Journal Info:
Nlm Unique ID:  101525249     Medline TA:  Nanoscale     Country:  England    
Other Details:
Languages:  eng     Pagination:  164-70     Citation Subset:  -    
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan.
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