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Title: Comparable Enhancement of TERS Signals from WSe2 on Chromium and Gold

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6]; ORCiD logo [4]
  1. Horiba Instruments Inc., Novato, CA (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.; Theiss Research, Inc., La Jolla, CA (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Physical Measurement Lab.
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Cornell Univ., Ithaca, NY (United States); Univ. of Manchester (United Kingdom)
  6. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.

Plasmonic tip-sample junctions, at which the incident and scattered optical fields are localized and optimally enhanced, are often exploited to achieve ultrasensitive and highly spatially localized tip-enhanced Raman scattering (TERS). Recent work has demonstrated that the sensitivity and spatial resolution that are required to probe single molecules are attainable in such platforms. In this work, we observe and rationalize comparable TERS from few-layer WSe2 single crystals exfoliated onto Au- and Cr-coated Si substrates, using a plasmonic TERS probe excited with a 638-nm laser. Our experimental observations are supported by finite-difference time-domain simulations that illustrate that the attainable field enhancement factors at the Au-Au and Au-Cr tip-sample nanojunctions are comparable in magnitude. Furthermore, through a combined experimental and theoretical analysis, we propose that besides Au/Ag, several metallic substrates may be used to record bright TERS spectral images.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Office of Biological and Environmental Research (BER); National Institute of Standards and Technology (NIST)
Grant/Contract Number:
AC05-76RL01830; 70NANB18H155
OSTI ID:
1708858
Report Number(s):
PNNL-SA-140248
Journal Information:
Journal of Physical Chemistry. C, Vol. 124, Issue 16; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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