TY - JOUR
T1 - Tolerance to Stretching in Thiol-Terminated Single-Molecule Junctions Characterized by Surface-Enhanced Raman Scattering
AU - Kobayashi, S.
AU - Kaneko, S.
AU - Kiguchi, M.
AU - Tsukagoshi, K.
AU - Nishino, T.
N1 - Funding Information:
The authors acknowledge technical help from the Open Facility Center of the Materials Analysis Division of Tokyo Institute of Technology for the scanning electron microscopy observations. This work was financially supported by a Grant-in-Aid for Scientific Research from MEXT (20K05445), JST CREST (JPMJCR18I4), JST PRESTO (JPMJPR18I3), and the Iketani Science and Technology Foundation.
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/8/20
Y1 - 2020/8/20
N2 - We investigated the change in the metal-molecule interaction in a 1,4-benzenedithiol (BDT) single-molecule junction using a combination of surface-enhanced Raman scattering spectra and current-voltage curves. During the stretching process, the conductance of the junction systematically decreased, accompanied by an increase in the vibrational energy of the CC stretching mode. By analyzing the current-voltage curves and Raman spectra, we found that the interaction between the πorbital of BDT and the electronic states of Au was diminished by the orientation change of BDT during the stretching process. A comparison with a 4,4′-bipyridine single-molecule junction revealed that the reduction of coupling of the Au-S contacts was smaller than that of Au-pyridine contacts. Therefore, the electronic states originating from the contact geometry are responsible for the tolerance to the stretching of thiol-Terminated molecular junctions.
AB - We investigated the change in the metal-molecule interaction in a 1,4-benzenedithiol (BDT) single-molecule junction using a combination of surface-enhanced Raman scattering spectra and current-voltage curves. During the stretching process, the conductance of the junction systematically decreased, accompanied by an increase in the vibrational energy of the CC stretching mode. By analyzing the current-voltage curves and Raman spectra, we found that the interaction between the πorbital of BDT and the electronic states of Au was diminished by the orientation change of BDT during the stretching process. A comparison with a 4,4′-bipyridine single-molecule junction revealed that the reduction of coupling of the Au-S contacts was smaller than that of Au-pyridine contacts. Therefore, the electronic states originating from the contact geometry are responsible for the tolerance to the stretching of thiol-Terminated molecular junctions.
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U2 - 10.1021/acs.jpclett.0c01526
DO - 10.1021/acs.jpclett.0c01526
M3 - Article
C2 - 32619093
AN - SCOPUS:85089768266
SN - 1948-7185
VL - 11
SP - 6712
EP - 6717
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 16
ER -