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

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.

doi:10.1021/acs.nanolett.5b00609

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

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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:

El-Khoury, Patrick Z. ^[1]; Gong, Yu ^[1]; Abellan, Patricia ^[1]; Arey, Bruce W. ^[1]; Joly, Alan G. ^[1]; Hu, Dehong ^[1]; Evans, James E. ^[1]; Browning, Nigel D. ^[1]; Hess, Wayne P. ^[1]

Physical Sciences Division and ‡Environmental and Molecular Sciences Laboratory , Pacific Northwest National Laboratory, Richland, Washington 99352, United States

Publication Date:: Mon Mar 09 00:00:00 EDT 2015

Research Org.:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

OSTI Identifier:: 1172173

Alternate Identifier(s):: OSTI ID: 1182874

Report Number(s):: PNNL-SA-106991
Journal ID: ISSN 1530-6984

Grant/Contract Number:: AC05-76RL01830

Resource Type:: Published Article

Journal Name:: Nano Letters

Additional Journal Information:: Journal Name: Nano Letters Journal Volume: 15 Journal Issue: 4; Journal ID: ISSN 1530-6984

Publisher:: American Chemical Society

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.

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                    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.  https://doi.org/10.1021/acs.nanolett.5b00609

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                    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. Mon .  
"Tip-Enhanced Raman Nanographs: Mapping Topography and Local Electric Fields".  United States.  https://doi.org/10.1021/acs.nanolett.5b00609.

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@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},

  number       = 4,

  volume       = 15,

  place        = {United States},

  year         = {Mon Mar 09 00:00:00 EDT 2015},

  month        = {Mon Mar 09 00:00:00 EDT 2015}

}

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