Spontaneous versus Stimulated Surface-Enhanced Raman Scattering of Liquid Water | Zendy

Paulina Filipczak | Zendy; Marcin Pastorczak | Zendy; Tomasz M. Kardaś | Zendy; Michał Nejbauer | Zendy; Czesław Radzewicz | Zendy; Marcin Kozanecki | Zendy

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Spontaneous versus Stimulated Surface-Enhanced Raman Scattering of Liquid Water

Author(s) -

Paulina Filipczak,

Marcin Pastorczak,

Tomasz M. Kardaś,

Michał Nejbauer,

Czesław Radzewicz,

Marcin Kozanecki

Publication year - 2020

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.0c06937

Subject(s) - raman spectroscopy , raman scattering , overtone , resonance (particle physics) , surface plasmon resonance , materials science , femtosecond , analytical chemistry (journal) , chemistry , nanoparticle , laser , optics , nanotechnology , atomic physics , spectral line , physics , chromatography , astronomy

We have observed for the first time the surface-enhanced (SE) signal of water in an aqueous dispersion of silver nanoparticles in spontaneous (SERS) and femtosecond stimulated Raman (SE-FSRS) processes with different wavelengths of the Raman pump (515, 715, and 755 nm). By estimating the fraction of water molecules that interact with the metal surface, we have calculated enhancement factors (EF): 4.8 × 10 6 for SERS and (3.6-3.7) × 10 6 for SE-FSRS. Furthermore, we have tested the role of simultaneous plasmon resonance and Raman resonance conditions for the a ν 1 + bν 3 overtone mode of water (755 nm) in SE-FSRS signal amplification. When the wavelength of the Raman pump is within the plasmon resonance of the metal nanoparticles, the Raman resonance has a negligible effect on the EF. However, the Raman resonance with the a ν 1 + bν 3 mode strongly enhances the signal of the fundamental OH stretching mode of water.

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