Tip-Enhanced Raman Spectroscopy

Umakoshi, Takayuki; Verma, Prabhat

doi:10.1007/978-981-33-6084-6_8

Cited by 2 publications

(1 citation statement)

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“…Raman spectroscopy reflects the vibrational modes of materials through detecting the scattering of photons and has been widely used in the research of carbon allotropes like carbon nanotubes, graphene, cyclo-carbon, and other low-dimensional materials. , In order to achieve high spatial resolution, tip-enhanced Raman spectroscopy (TERS) combines Raman spectroscopy with near-field techniques utilizing a sharp metallic tip . The TERS tip can confine electromagnetic fields within ultrathin gaps and enable the characterization of samples at nanoscale, and the amplification of the near-field signal due to the field enhancement has been observed unambiguously in experiments. , Spatial resolution below 1 nm of a single molecule has been achieved by matching the resonance of the nanocavity plasmon to the molecular vibronic transitions, particularly the downward transition responsible for the emission of Raman photons .…”

Section: Introductionmentioning

confidence: 99%

Selective Raman Enhancement with Electronic Sensitivity in Tip-Enhanced Raman Spectroscopy

Yan

et al. 2022

J. Phys. Chem. A

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Chemical interaction between the tips and molecules is one of the main contributing mechanisms to tip-enhanced Raman spectroscopy (TERS). In this work, we calculate the TERS spectra of the biphenylene (BP) dimer at 13 nonequivalent tip sites by means of density functional theory and explore the influence of the TERS tip on vibrational mode characters and Raman intensity. The Raman intensity of the vibrational mode involving the antisymmetric stretching of tetra-rings is found to be specifically enhanced. We attribute this specific enhancement to the electronic sensitive atom vibrational character of the mode and infer that the vibrational strength of atoms can be tuned by the TERS tip. The results provide an intuitive interpretation on the effects of tip-induced electronic redistributions on specific vibrational modes in TERS and indicate the possibility to further improve the TERS resolution.

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