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Journal Article

Dramatic Enhancement of Tip-Enhanced Raman Scattering Mediated by Atomic Point Contact Formation

MPS-Authors
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Liu,  Shuyi
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Cirera,  Borja
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons32794

Müller,  Melanie
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons188971

Hammud,  Adnan
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22250

Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons32784

Kumagai,  Takashi
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
JST-PRESTO;

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acs.nanolett.0c01791.pdf
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Citation

Liu, S., Cirera, B., Sun, Y., Hamada, I., Müller, M., Hammud, A., et al. (2020). Dramatic Enhancement of Tip-Enhanced Raman Scattering Mediated by Atomic Point Contact Formation. Nano Letters, 20(8), 5879-5884. doi:10.1021/acs.nanolett.0c01791.


Cite as: https://hdl.handle.net/21.11116/0000-0006-C129-2
Abstract
2Tip-enhanced Raman scattering (TERS) in ångström-scale plasmonic cavities has drawn increasing attention. However, Raman scattering at vanishing cavity distances remains unexplored. Here we show the evolution of TERS in transition from the tunneling regime to atomic point contact (APC). A stable APC is reversibly formed in the junction between an Ag tip and ultrathin ZnO or NaCl films on the Ag(111) surface at 10 K. An abrupt increase of the TERS intensity occurs upon APC formation for ZnO, but not for NaCl. This remarkable observation is rationalized by a difference in hybridization between the Ag tip and these films, which determines the contribution of charge transfer enhancement in the fused plasmonic junction. The strong hybridization between the Ag tip and ZnO is corroborated by the appearance of a new vibrational mode upon APC formation, whereas it is not observed for the chemically-inert NaCl.