Tip-enhanced Raman Spectroscopy (TERS) is a nanoscale chemical analysis and imaging method with a spatial resolution on the order of 10 nm. TERS is similar to SERS, and relies on enhancement of the local electromagnetic field in the vicinity of a plasmonic nanostructure that is scanned over a sample by means of a scanning probe microscope, using either AFM or STM feedback. The local enhancement of Raman scattered light is many orders of magnitude, large enough to render monomolecular films spectroscopically visible that would otherwise be optically too thin to be analyzed with conventional vibrational spectroscopy.
The working principle and experimental realization of TERS will first be presented . An important advance concerns the production long-lived silver TERS tips that, thanks to the presence of a chemical protection layer, live for many weeks as opposed to the typical lifetime of ≈1 day for bare Ag tips . The focus of this presentation will be on applications of TERS to the spatially resolved chemical analysis of molecular nanomaterials, including graphene, self-assembled monolayers , and a novel class of materials, 2D polymers .
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 L. Opilik, Ü. Dogan, C.-Y. Li, B. Stephanidis, J.-F. Li, an R. Zenobi, Chemical Production of Thin Protective Coatings on Optical Nanotips for Tip-Enhanced Raman Spectroscopy, J. Phys. Chem. C 120, 20828-20832 (2016).
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 W. Dai et al., Synthesis of a Two-Dimensional Covalent Organic Monolayer through Dynamic Imine Chemistry at the Air/Water Interface, Angew. Chem. Int. Ed. 55, 213-217 (2016).
Renato Zenobi, "Tip-enhanced Raman spectroscopy for nanoscale chemical analysis and imaging," Proc. SPIE 10231, Optical Sensors 2017, 1023102 (Presented at SPIE Optics + Optoelectronics: April 24, 2017; Published: 25 January 2018); https://doi.org/10.1117/12.2271262.5472490439001.
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