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Differences in single and aggregated nanoparticle plasmon spectroscopy.

Pushkar Singh1, Tanja Deckert-Gaudig, Henrik Schneidewind

  • 1Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany.

Physical Chemistry Chemical Physics : PCCP
|December 18, 2014
PubMed
Summary
This summary is machine-generated.

Tip-enhanced Raman spectroscopy (TERS) reveals structural information from extremely small numbers of molecules, suppressing averaging effects. This technique allows investigation of micro-ensembles, unlike traditional vibrational spectroscopy.

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Area of Science:

  • Surface-enhanced Raman Spectroscopy (SERS)
  • Tip-Enhanced Raman Spectroscopy (TERS)
  • Nanophotonics
  • Surface Science

Background:

  • Vibrational spectroscopy typically yields averaged structural data from numerous molecules.
  • Conventional methods lack the sensitivity to probe individual or small groups of molecules.
  • Understanding molecular behavior at the nanoscale requires techniques with higher spatial resolution.

Purpose of the Study:

  • To demonstrate the capability of TERS to overcome the limitations of traditional vibrational spectroscopy.
  • To investigate the suppression of orientational averaging effects in TERS experiments.
  • To analyze molecular ensembles at the microscale using TERS.

Main Methods:

  • Acquisition and comparison of TERS and SERS spectra.
  • Analysis of peak position variation and full width at half maximum (FWHM) in spectral data.
  • Experimental setup utilizing gold (Au) nanoplates and nanoparticles as substrates.

Main Results:

  • TERS spectra exhibit significantly larger peak position variations compared to SERS spectra.
  • TERS spectra demonstrate reproducibly smaller FWHM, indicating fewer excited molecules.
  • Evidence of suppressed orientational averaging effects in TERS, enabling micro-ensemble analysis.

Conclusions:

  • TERS enables the study of molecular micro-ensembles by minimizing orientational averaging.
  • The reduced number of excited molecules in TERS leads to distinct spectral characteristics.
  • This study validates TERS as a powerful tool for nanoscale structural and orientational analysis of adsorbed molecules.