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

Abstract

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.

Authors:
 [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.
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Office of Biological and Environmental Research (BER); National Institute of Standards and Technology (NIST)
OSTI Identifier:
1708858
Report Number(s):
PNNL-SA-140248
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
AC05-76RL01830; 70NANB18H155
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 124; Journal Issue: 16; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Crystals; metals; gold; plasmonics; Raman spectroscopy

Citation Formats

Krayev, Andrey V., Krylyuk, Sergiy, Ilic, Robert, Hight Walker, Angela, Bhattarai, Ashish, Joly, Alan G., Velicky, Matej, Davydov, Albert, and El-Khoury, Patrick Z.. Comparable Enhancement of TERS Signals from WSe2 on Chromium and Gold. United States: N. p., 2020. Web. https://doi.org/10.1021/acs.jpcc.0c01298.
Krayev, Andrey V., Krylyuk, Sergiy, Ilic, Robert, Hight Walker, Angela, Bhattarai, Ashish, Joly, Alan G., Velicky, Matej, Davydov, Albert, & El-Khoury, Patrick Z.. Comparable Enhancement of TERS Signals from WSe2 on Chromium and Gold. United States. https://doi.org/10.1021/acs.jpcc.0c01298
Krayev, Andrey V., Krylyuk, Sergiy, Ilic, Robert, Hight Walker, Angela, Bhattarai, Ashish, Joly, Alan G., Velicky, Matej, Davydov, Albert, and El-Khoury, Patrick Z.. Mon . "Comparable Enhancement of TERS Signals from WSe2 on Chromium and Gold". United States. https://doi.org/10.1021/acs.jpcc.0c01298. https://www.osti.gov/servlets/purl/1708858.
@article{osti_1708858,
title = {Comparable Enhancement of TERS Signals from WSe2 on Chromium and Gold},
author = {Krayev, Andrey V. and Krylyuk, Sergiy and Ilic, Robert and Hight Walker, Angela and Bhattarai, Ashish and Joly, Alan G. and Velicky, Matej and Davydov, Albert and El-Khoury, Patrick Z.},
abstractNote = {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.},
doi = {10.1021/acs.jpcc.0c01298},
journal = {Journal of Physical Chemistry. C},
number = 16,
volume = 124,
place = {United States},
year = {2020},
month = {4}
}

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