Suppressing Molecular Charging, Nanochemistry, and Optical Rectification in the Tip-Enhanced Raman Geometry.

abstract

• Classical versus quantum plasmons are responsible for the recorded signals in non-contact-mode versus contact-mode tip-enhanced Raman spectroscopy (TERS) and lead to distinct observables. Under otherwise identical experimental conditions, we illustrate the concept through tapping- and contact-mode TERS mapping of chemically functionalized silver nanocubes. Whereas molecular charging, chemical transformations, and optical rectification are prominent observables in contact-mode TERS, the same effects are suppressed using tapping-mode feedback. In effect, this work demonstrates that nanoscale physical and chemical processes can be accessed and/or suppressed on demand in the TERS geometry. The advantages of tapping-mode TERS are otherwise highlighted with the latter in mind.

authors

• Kurouski, Dzmitry

published proceedings

• J Phys Chem Lett

altmetric score

• 0.5

author list (cited authors)

• Wang, C., O'Callahan, B. T., Kurouski, D., Krayev, A., Schultz, Z. D., & El-Khoury, P. Z.

citation count

• 24

publication date

• August 2020

publisher

• American Chemical Society (ACS)  Publisher

keywords

• 51 Physical Sciences

Digital Object Identifier (DOI)

• 10.1021/acs.jpclett.0c01413

start page

• 5890

end page

• 5895

volume

• 11

issue

• 15

URL

• http://dx.doi.org/10.1021/acs.jpclett.0c01413