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Title: Visualizing Electric Fields at Au(111) Step Edges via Tip-Enhanced Raman Scattering

Abstract

Tip-enhanced Raman scattering (TERS) can be used to image plasmon-enhanced local electric fields on the nanoscale. This is illustrated through ambient TERS measurements recorded using silver atomic force microscope tips coated with 4-mercaptobenzonitrile molecules and used to image step edges on an Au(111) surface. The observed 2D TERS images uniquely map electric fields localized at Au(111) step edges following 671-nm excitation. We establish that our measurements are not only sensitive to spatial variations in the enhanced electric fields but also to their vector components. We also experimentally demonstrate that (i) few nanometer precision is attainable in TERS nanoscopy using corrugated tips with nominally radii on the order of 100-200 nm, and (ii) TERS signals do not necessarily exhibit the expected E4 dependence. Overall, we illustrate the concept of electric field imaging via TERS and establish the connections between our observations and conventional TERS chemical imaging measurements.

Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1411890
Report Number(s):
PNNL-SA-129323
Journal ID: ISSN 1530-6984; KC0301050
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 17; Journal Issue: 11; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

None, None. Visualizing Electric Fields at Au(111) Step Edges via Tip-Enhanced Raman Scattering. United States: N. p., 2017. Web. doi:10.1021/acs.nanolett.7b04027.
None, None. Visualizing Electric Fields at Au(111) Step Edges via Tip-Enhanced Raman Scattering. United States. https://doi.org/10.1021/acs.nanolett.7b04027
None, None. 2017. "Visualizing Electric Fields at Au(111) Step Edges via Tip-Enhanced Raman Scattering". United States. https://doi.org/10.1021/acs.nanolett.7b04027.
@article{osti_1411890,
title = {Visualizing Electric Fields at Au(111) Step Edges via Tip-Enhanced Raman Scattering},
author = {None, None},
abstractNote = {Tip-enhanced Raman scattering (TERS) can be used to image plasmon-enhanced local electric fields on the nanoscale. This is illustrated through ambient TERS measurements recorded using silver atomic force microscope tips coated with 4-mercaptobenzonitrile molecules and used to image step edges on an Au(111) surface. The observed 2D TERS images uniquely map electric fields localized at Au(111) step edges following 671-nm excitation. We establish that our measurements are not only sensitive to spatial variations in the enhanced electric fields but also to their vector components. We also experimentally demonstrate that (i) few nanometer precision is attainable in TERS nanoscopy using corrugated tips with nominally radii on the order of 100-200 nm, and (ii) TERS signals do not necessarily exhibit the expected E4 dependence. Overall, we illustrate the concept of electric field imaging via TERS and establish the connections between our observations and conventional TERS chemical imaging measurements.},
doi = {10.1021/acs.nanolett.7b04027},
url = {https://www.osti.gov/biblio/1411890}, journal = {Nano Letters},
issn = {1530-6984},
number = 11,
volume = 17,
place = {United States},
year = {2017},
month = {10}
}