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Title: Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields

Abstract

We report tip-enhanced Raman scattering experiments in which topographic and local electric field images are recorded simultaneously. We employ a Raman-active 4,4’-dimercaptostilbene (DMS)-coated gold tip of an atomic force microscope to map the topography and image electric fields localized at nanometric (20 and 5 nm-wide) slits lithographically etched in silver. Bi-modal imaging is feasible by virtue of the recorded scanning probe position-dependent frequency-resolved optical response, which can be sub-divided into two components. The first is a 500-2250 cm-1 Raman-shifted signal, characteristic of DMS. The molecular response reports on topography through intensity contrast in the absence/presence of a plasmonic junction formed between the scanning probe and patterned silver surface. Here, we demonstrate that sub-15 nm spatial resolution is attainable using a 30 nm DMS-coated gold tip. The second response consists of two correlated sub-500 cm-1 signals arising from mirror-like reflections of (i) the incident laser, and (ii) the Raman scattered response of an underlying glass support (at 100-500 cm-1) off the gold tip. We show that both the low-wavenumber signals trace the local electric fields in the vicinity of the nanometric slits.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1172173
Alternate Identifier(s):
OSTI ID: 1182874
Report Number(s):
PNNL-SA-106991
48129
Grant/Contract Number:
AC05-76RL01830
Resource Type:
Journal Article: Published Article
Journal Name:
Nano Letters, 15(4):2385-2390
Additional Journal Information:
Journal Name: Nano Letters, 15(4):2385-2390
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Environmental Molecular Sciences Laboratory

Citation Formats

El-Khoury, Patrick Z., Gong, Yu, Abellan, Patricia, Arey, Bruce W., Joly, Alan G., Hu, Dehong, Evans, James E., Browning, Nigel D., and Hess, Wayne P. Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields. United States: N. p., 2015. Web. doi:10.1021/acs.nanolett.5b00609.
El-Khoury, Patrick Z., Gong, Yu, Abellan, Patricia, Arey, Bruce W., Joly, Alan G., Hu, Dehong, Evans, James E., Browning, Nigel D., & Hess, Wayne P. Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields. United States. doi:10.1021/acs.nanolett.5b00609.
El-Khoury, Patrick Z., Gong, Yu, Abellan, Patricia, Arey, Bruce W., Joly, Alan G., Hu, Dehong, Evans, James E., Browning, Nigel D., and Hess, Wayne P. Thu . "Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields". United States. doi:10.1021/acs.nanolett.5b00609.
@article{osti_1172173,
title = {Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields},
author = {El-Khoury, Patrick Z. and Gong, Yu and Abellan, Patricia and Arey, Bruce W. and Joly, Alan G. and Hu, Dehong and Evans, James E. and Browning, Nigel D. and Hess, Wayne P.},
abstractNote = {We report tip-enhanced Raman scattering experiments in which topographic and local electric field images are recorded simultaneously. We employ a Raman-active 4,4’-dimercaptostilbene (DMS)-coated gold tip of an atomic force microscope to map the topography and image electric fields localized at nanometric (20 and 5 nm-wide) slits lithographically etched in silver. Bi-modal imaging is feasible by virtue of the recorded scanning probe position-dependent frequency-resolved optical response, which can be sub-divided into two components. The first is a 500-2250 cm-1 Raman-shifted signal, characteristic of DMS. The molecular response reports on topography through intensity contrast in the absence/presence of a plasmonic junction formed between the scanning probe and patterned silver surface. Here, we demonstrate that sub-15 nm spatial resolution is attainable using a 30 nm DMS-coated gold tip. The second response consists of two correlated sub-500 cm-1 signals arising from mirror-like reflections of (i) the incident laser, and (ii) the Raman scattered response of an underlying glass support (at 100-500 cm-1) off the gold tip. We show that both the low-wavenumber signals trace the local electric fields in the vicinity of the nanometric slits.},
doi = {10.1021/acs.nanolett.5b00609},
journal = {Nano Letters, 15(4):2385-2390},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 05 00:00:00 EST 2015},
month = {Thu Mar 05 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acs.nanolett.5b00609

Citation Metrics:
Cited by: 14 works
Citation information provided by
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