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Tip-enhanced Raman spectroscopy: principles, practice, and applications to nanospectroscopic imaging of 2D materials

  • Feng Shao
  • Renato Zenobi
Review
  • 138 Downloads
Part of the following topical collections:
  1. ABC Highlights: authored by Rising Stars and Top Experts

Abstract

Two-dimensional (2D) materials have been one of the most extensively studied classes of modern materials, due to their astonishing chemical, optical, electronic, and mechanical properties, which are different from their bulk counterparts. The edges, grain boundaries, local strain, chemical bonding, molecular orientation, and the presence of nanodefects in these 2D monolayers (MLs) will strongly affect their properties. Currently, it is still challenging to investigate such atomically thin 2D monolayers with nanoscale spatial resolution, especially in a label-free and non-destructive way. Tip-enhanced Raman spectroscopy (TERS), which combines the merits of both scanning probe microscopy (SPM) and Raman spectroscopy, has become a powerful analytical technique for studying 2D monolayers, because it allows very high-resolution and high-sensitivity local spectroscopic investigation and imaging and also provides rich chemical information. This review provides a summary of methods to study 2D monolayers and an overview of TERS, followed by an introduction to the current state-of-the-art and theoretical understanding the spatial resolution in TERS experiments. Surface selection rules are also discussed. We then focus on the capabilities and potential of TERS for nanoscale chemical imaging of 2D materials, such as graphene, transition metal dichalcogenides (TMDCs), and 2D polymers. We predict that TERS will become widely accepted and used as a versatile imaging tool for chemical investigation of 2D materials at the nanoscale.

Graphical abstract

Keywords

Tip-enhanced Raman spectroscopy Nanoscale chemical imaging Surface selection rules Two-dimensional polymers Monolayers 

Notes

Acknowledgements

The authors gratefully acknowledge Dr. Guillaume Goubert for the helpful discussions, ETH Zurich for the financial support, and the European Research Council (ERC) for the generous support of this research via an Advanced Grant (#741431-2DNanoSpec). F.S. thanks the Chinese Scholarship Council for a Ph.D. student fellowship.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemistry and Applied BiosciencesETH ZurichZurichSwitzerland

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