TY - JOUR
T1 - Conductance Modulation in an α-Terthiophene Molecular Junction Characterized by Surface-Enhanced Raman Scattering
AU - Kobayashi, Shuji
AU - Kaneko, Satoshi
AU - Tsukagoshi, Kazuhito
AU - Nishino, Tomoaki
N1 - Funding Information:
The numerical calculations were performed on a TSUBAME3.0 supercomputer at the Tokyo Institute of Technology, supported by the MEXT Project of the Tokyo Tech Academy for Convergence of Materials and Informatics (TAC-MI). This work was partially sup- ported by a Grant-in-Aid for Scientific Research (20K05445, 21H01959), JSPS Fellowship (JP20J20661) from MEXT, and Tokyo Tech Fund (ASUNARO Grant).
Publisher Copyright:
© 2023 The author(s)
PY - 2023
Y1 - 2023
N2 - We fabricate α-terthiophene single-molecule junctions (SMJs) and characterize their conductive states by the simultaneous measurements of surface-enhanced Raman scattering (SERS) and electronic conductance. The α-terthiophene SMJ showed broad conductance distribution due to the different portions of the multiple aromatic rings connected to the electrodes. SERS spectra obtained by the simultaneous measurement showed the vibrational energy of the C-C stretching mode depends on the conductance. The Raman spectra calculated by the density-functional theory (DFT) explain the tendency of the vibrational energy shift for typical junction structures. Therefore, the SERS measurement and DFT calculation have revealed that conductance modulation originates from the change in the connecting point of the α-terthiophene SMJ. These findings provide efficient information for building molecule-based circuits and lead to molecule-based potentiometry with aromatic rings.
AB - We fabricate α-terthiophene single-molecule junctions (SMJs) and characterize their conductive states by the simultaneous measurements of surface-enhanced Raman scattering (SERS) and electronic conductance. The α-terthiophene SMJ showed broad conductance distribution due to the different portions of the multiple aromatic rings connected to the electrodes. SERS spectra obtained by the simultaneous measurement showed the vibrational energy of the C-C stretching mode depends on the conductance. The Raman spectra calculated by the density-functional theory (DFT) explain the tendency of the vibrational energy shift for typical junction structures. Therefore, the SERS measurement and DFT calculation have revealed that conductance modulation originates from the change in the connecting point of the α-terthiophene SMJ. These findings provide efficient information for building molecule-based circuits and lead to molecule-based potentiometry with aromatic rings.
KW - Electrical conductivity
KW - Metal-molecule interface
KW - Single-molecule junction
KW - Surface-enhanced Raman scattering
KW - α-Terthiophene
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U2 - 10.1380/ejssnt.2023-004
DO - 10.1380/ejssnt.2023-004
M3 - Article
AN - SCOPUS:85148427624
SN - 1348-0391
VL - 21
SP - 24
EP - 29
JO - e-Journal of Surface Science and Nanotechnology
JF - e-Journal of Surface Science and Nanotechnology
IS - 1
ER -