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Photoinduced Enhanced Raman from Lithium Niobate on Insulator Template
journal contribution
posted on 2018-08-14, 00:00 authored by Rusul M. Al-Shammari, Mohammad Amin Baghban, Nebras Al-attar, Aoife Gowen, Katia Gallo, James H. Rice, Brian J. RodriguezPhotoinduced
enhanced Raman spectroscopy from a lithium niobate on insulator (LNOI)–silver
nanoparticle template is demonstrated both by irradiating the template
with 254 nm ultraviolet (UV) light before adding an analyte and before
placing the substrate in the Raman system (substrate irradiation)
and by irradiating the sample in the Raman system after adding the
molecule (sample irradiation). The photoinduced enhancement enables
up to an ∼sevenfold increase of the surface-enhanced Raman
scattering signal strength of an analyte following substrate irradiation,
whereas an ∼threefold enhancement above the surface-enhanced
signal is obtained for sample irradiation. The photoinduced enhancement
relaxes over the course of ∼10 h for a substrate irradiation
duration of 150 min before returning to initial signal levels. The
increase in Raman scattering intensity following UV irradiation is
attributed to photoinduced charge transfer from the LNOI template
to the analyte. New Raman bands are observed following UV irradiation,
the appearance of which is suggestive of a photocatalytic reaction
and highlight the potential of LNOI as a photoactive surface-enhanced
Raman spectroscopy substrate.
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Keywords
Raman systemphotoinduced enhancementanalytePhotoinduced Enhanced RamanNew Raman bandsLNOIUV irradiationphotoinduced charge transfertemplatephotoactive surface-enhanced Raman spectroscopy substratesubstrate irradiationInsulator Template Photoinducedsignalsample irradiationsubstrate irradiation duration
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