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

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.

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 Creators:
Liu, Shuyi1, Author           
Cirera, Borja1, Author           
Sun, Yang2, Author
Hamada, Ikutaro2, 3, Author
Müller, Melanie1, Author           
Hammud, Adnan4, Author           
Wolf, Martin1, Author           
Kumagai, Takashi1, 5, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan., ou_persistent22              
3Department of Precision Science and Technology, Graduate School of Engineering, Osaka University, 2-1 Yamada-Oka Suita, Osaka 565-0871, Japan, ou_persistent22              
4Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
5JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan., ou_persistent22              

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Free keywords: ip-enhanced Raman spectroscopy, Scanning tunneling microscopy, Plamonic nanocavity, Atomic point contact, Ultrathin films
 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.

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Language(s): eng - English
 Dates: 2020-07-162020-04-282020-04-282020-07-172020-08-12
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.nanolett.0c01791
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 6 Volume / Issue: 20 (8) Sequence Number: - Start / End Page: 5879 - 5884 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403