Protocol and reference material for measuring the nanoantenna enhancement factor in Tip-enhanced Raman Spectroscopy

Neto, Aroldo Ribeiro; Rabelo, Cassiano; Cançado, Luiz Gustavo; Engel, Michael; Steiner, M.; Jório, Ado

doi:10.1109/inscit.2019.8868468

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…A potential alternative method has been presented theoretically in the literature that uses the TERS approach curve on an ideal two-dimensional scattering surface. The tip radius is also measured using a topographic alignment grid . This approach may provide characterization of TERS systems with reduced sample dependence but has not been confirmed experimentally.…”

Section: Resultsmentioning

confidence: 99%

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Single-Walled Carbon Nanotubes as One-Dimensional Scattering Surfaces for Measuring Point Spread Functions and Performance of Tip-Enhanced Raman Spectroscopy Probes

McCourt

Routley

Ruppert

et al. 2022

ACS Appl. Nano Mater.

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This Article describes a method for the characterization of the imaging performance of tip-enhanced Raman spectroscopy probes. The proposed method identifies single-walled carbon nanotubes that are suitable as one-dimensional Raman scattering objects by using atomic force microscope maps and exciting the radial breathing mode using 785 nm illumination. High-resolution cross sections of the nanotubes are collected, and the point spread functions are calculated along with the optical contrast and spot diameter. The method is used to characterize several probes, which results in a set of imaging recommendations and a summary of limitations for each probe. Elemental analysis and boundary element simulations are used to explain the formation of multiple peaks in the point spread functions as a consequence of random grain formation on the probe surface.

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Section: Resultsmentioning

confidence: 99%

“…The tip radius is also measured using a topographic alignment grid. 62 This approach may provide characterization of TERS systems with reduced sample dependence but has not been confirmed experimentally.…”

Section: ■ Introductionmentioning

confidence: 99%

Single-Walled Carbon Nanotubes as One-Dimensional Scattering Surfaces for Measuring Point Spread Functions and Performance of Tip-Enhanced Raman Spectroscopy Probes

McCourt

Routley

Ruppert

et al. 2022

ACS Appl. Nano Mater.

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“…Second, aligning laser to the tip apex and using a topographic orientation grid enables a real and fast examination of the tip apex radius. Third, the tip approach curve is fitted . As a reference sample, Sacco et al use thiol nanopatterns (suitable for STM and AFM) .…”

Section: Discussionmentioning

confidence: 99%

“…To make the results more comparable, standardized methods for the calibration of spectrometers and measurements with reference samples are necessary. 77 Neto et al 153 developed a multistep protocol for measuring the improvement factor of TERS using a reference material for the calibration of confocal Raman and TERS (STM and AFM). First, the scanning confocal optical microscope must be focused on graphene (a strong Raman signal).…”

Section: The Main Experiments and Applications To Datementioning

confidence: 99%

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Challenges and Opportunities of Tip-Enhanced Raman Spectroscopy in Liquids

2021

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Tip-enhanced Raman spectroscopy (TERS) is an emerging technique with a large number of potential applications in different fields such as chemistry, physics, biology, life sciences, and materials science. TERS in liquids offers nondestructive and label-free topographical and chemical imaging of molecules and chemical reactions under native conditions at a nanometer scale. It combines Raman spectroscopy with scanning probe microscopy, providing a unique combination of chemical information and high spatial resolution. The versatility of TERS increases even further if it is modified for simultaneous electrochemical measurements. This paper reviews the recent progress of TERS in liquid, with a focus on molecular structures, interfaces, and chemical reactions studied to date. For example, TERS studies revealed nanoscale chemical images of various molecules containing a benzene ring such as thiophenol or carbon nanotubes. Additionally, heterogeneous catalytic reactions at the solid−liquid interface were investigated in a new way to gain a deeper insight into electrochemical processes. Furthermore, TERS measurements expanded our knowledge of several redox compounds and enabled new insights into various chemical transformations. Despite substantial progress, TERS in liquids is not yet a routine measurement method, and there are still several challenges to solve before TERS can unleash its full potential.

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Spatially Coherent Tip-Enhanced Raman Spectroscopy Measurements of Electron–Phonon Interaction in a Graphene Device

et al. 2023

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Coherence length (L c) of the Raman scattering process in graphene as a function of Fermi energy is obtained with spatially coherent tip-enhanced Raman spectroscopy. L c decreases when the Fermi energy is moved into the neutrality point, consistent with the concept of the Kohn anomaly within a ballistic transport regime. Since the Raman scattering involves electrons and phonons, the observed results can be rationalized either as due to unusually large variation of the longitudinal optical phonon group velocity v g, reaching twice the value for the longitudinal acoustic phonon, or due to changes in the electron energy uncertainty, both properties being important for optical and transport phenomena that might not be observable by any other technique.

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Protocol and reference material for measuring the nanoantenna enhancement factor in Tip-enhanced Raman Spectroscopy

Cited by 5 publications

References 13 publications

Single-Walled Carbon Nanotubes as One-Dimensional Scattering Surfaces for Measuring Point Spread Functions and Performance of Tip-Enhanced Raman Spectroscopy Probes

Single-Walled Carbon Nanotubes as One-Dimensional Scattering Surfaces for Measuring Point Spread Functions and Performance of Tip-Enhanced Raman Spectroscopy Probes

Challenges and Opportunities of Tip-Enhanced Raman Spectroscopy in Liquids

Spatially Coherent Tip-Enhanced Raman Spectroscopy Measurements of Electron–Phonon Interaction in a Graphene Device

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