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Volume 205, 2017
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The effect of STM parameters on tip-enhanced Raman spectra

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Abstract

In this work, we evaluate the dependence of tip-enhanced Raman (TER) spectra of a monolayer of thiophenol at a Au(111) electrode on the scanning tunneling microscope’s tunneling current set-point and bias voltage parameters. We find an increase of the TER intensity upon set-point increase or bias decrease as expected from a gap-distance reduction. The relations obtained follow a theoretical model considering a simple gap-distance change when tuning the mentioned parameters. We find that the value of the bias voltage affects the TER intensity to a larger extent than the current set-point. Therefore it is advisable to work in a low-bias regime when aiming for ultrasensitive TER measurements.

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Submitted
08 May 2017
Accepted
12 May 2017
First published
17 May 2017

This article is Open Access

Faraday Discuss., 2017,205, 233-243
Article type
Paper

The effect of STM parameters on tip-enhanced Raman spectra

N. M. Sabanés, A. Elizabeth, J. H. K. Pfisterer and K. F. Domke, Faraday Discuss., 2017, 205, 233
DOI: 10.1039/C7FD00164A

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