Journal
ACS NANO
Volume 12, Issue 11, Pages 11698-11703Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b07414
Keywords
vibronic states; molecular vibrations; rotamer; BTTT; molybdenum disulfide; MoS2; scanning tunneling microscopy
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Funding
- German Research Foundation [SFB 658, TRR 227]
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Tunneling spectroscopy is an important tool for the chemical identification of single molecules on surfaces. Here, we show that oligothiophene-based large organic molecules which only differ by single bond orientations can be distinguished by their vibronic fingerprint. These molecules were deposited on a monolayer of the transition metal dichalcogenide molybdenum disulfide (MoS2) on top of a Au(111) substrate. MoS2 features an electronic band gap for efficient decoupling of the molecular states. Furthermore, it exhibits a small electron-phonon coupling strength. Both of these material properties allow for the resolution of vibronic states in the range of the limit set by temperature broadening in our scanning tunneling microscope at 4.6 K. Using DFT calculations of the molecule in gas phase provides all details for an accurate simulation of the vibronic spectra of both rotamers.
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