Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Plasmonics IV (joint session O/CPP)
CPP 42.4: Talk
Wednesday, April 3, 2019, 15:45–16:00, H8
Tip-enhanced Raman spectroscopy of ultrathin ZnO layers on Ag(111) — •Shuyi Liu1, Martin Wolf1, and Takashi Kumagai1,2 — 1Department of Physical Chemistry, Fritz-Haber Institute of the Max-Planck Society, Faradayweg 4-6, 14195 Berlin, Germany. — 2JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan.
Tip-enhanced Raman spectroscopy (TERS) is a powerful nanoscale vibrational microspectroscopy combining high-spatial resolution of SPM with chemical sensitivity of surface enhanced Raman spectroscopy [1, 2, 3]. We report the TERS measurement of the ultrathin ZnO layers epitaxially grown on a Ag(111) surface. The enhancement mechanisms were examined in detail by a combination of STS and STM-induced luminescence spectroscopy with the TERS measurements. We found a clear correlation between the TERS signal and the plasmonic properties of the STM junction. It was also revealed that the TERS intensity increases exponentially with decreasing the tip-surface distance and the decay constant is largely different inside and outside the tunneling regime. Our results provide a detailed insights into the TERS mechanism and the plasmonic properties relevant for field enhancement and confinement in nanoscale cavities. References [1] Annu. Rev. Phys. Chem. 63, 379 (2012). [2] Chem. Rev., 117, 4961-4982 (2017) [3] Chem. Soc. Rev., 46, 4020 (2017).