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Tip-enhanced Raman spectroscopy (TERS) is one of the promising techniques to probe simultaneously local vibration and geometric structure of adsorbates on surfaces. In this study, we conducted room-temperature TERS measurement of 0.74 nm wide graphene nanoribbons (GNRs) fabricated on Au(111) by the on-surface polymerization technique under ultrahigh-vacuum conditions. We observed that the GNRs stably adsorbed and homogeneously distributed over the surface, whereas strong intensity fluctuation (blinking) of the TER spectra frequently emerges in the time series. We studied the intensity distribution of the characteristic D and G band systematically and ascribed its origin to the structural fluctuation of the tip apex.

Room-Temperature Tip-Enhanced Raman Spectroscopy for Graphene Nanoribbons Under Ultrahigh-Vacuum Conditions