Surface‐enhanced micro‐CARS mapping of a nanostructured cerium dioxide/aluminum film surface with gold nanoparticle‐bound organic molecules

Surface‐enhanced micro‐CARS mapping of a nanostructured cerium dioxide/aluminum film surface with gold nanoparticle‐bound organic molecules

Highly contrast epi‐surface‐enhanced coherent anti‐Stokes Raman scattering (SECARS) microimages of Au‐nanoparticle‐bound organic reporter molecule distributions at a surface of novel surface‐enhanced Raman scattering (SERS)‐active metamaterial junctions, based on nanoparticles spread over a nanostru...

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Bibliographic Details
Published in:Journal of Raman spectroscopy Vol. 49; no. 7; pp. 1145 - 1154
Main Authors: Fabelinsky, Viktor I., Kozlov, Dimitrii N., Orlov, Sergey N., Polivanov, Yury N., Shcherbakov, Ivan A., Smirnov, Valery V., Vereschagin, Konstantin A., Arzumanyan, Grigory M., Mamatkulov, Kahramon Z., Afanasiev, Konstantin N., Lagarkov, Andrey N., Ryzhikov, Ilya A., Sarychev, Andrey K., Budashov, Igor A., Nechaeva, Natalia L., Kurochkin, Ilya N.
Format: Journal Article
Language:English
Published: Bognor Regis Wiley Subscription Services, Inc 01-07-2018
Subjects:
Aluminum
Au‐nanoparticles
biosensor
Biosensors
CeO2
Cerium
Cerium oxides
Coherent scattering
Conjugates
Coupling (molecular)
Excitation
Gold
Lasers
Metal films
metamaterial
Metamaterials
Molecular chains
Nanoparticles
Nanostructure
Nitrobenzoic acid
Organic chemistry
Raman spectra
SECARS
Sensitivity enhancement
Weight reduction
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Summary:Highly contrast epi‐surface‐enhanced coherent anti‐Stokes Raman scattering (SECARS) microimages of Au‐nanoparticle‐bound organic reporter molecule distributions at a surface of novel surface‐enhanced Raman scattering (SERS)‐active metamaterial junctions, based on nanoparticles spread over a nanostructured CeO2 faceted dielectric film, deposited on an Al sublayer, were recorded at two‐color picosecond excitation of the surface in the near‐infrared spectral range. For this, a scanning confocal laser‐based micro‐CARS spectrometer was employed. The investigations showed that at Raman resonant laser excitation of the molecules/Au‐NP conjugates immobilized on the surface strong SECARS signals can be generated with laser powers not deteriorating the conjugates. Coupling CARS with the plasmonic metamaterial structures under investigation provided excellent chemical imaging contrast (up to 400) for biochemically relevant 5‐thio(2‐nitrobenzoic acid) and 4‐mercaptophenylboronic acid reporter molecules. Taking into account easy handling and utmost long‐term stability of the investigated metamaterial junction at ambient conditions, it might be considered as a promising perspective for a single‐molecule‐sensitivity surface‐enhanced Raman scattering or SECARS biosensor. Highly contrast epi‐SECARS microimages of Au‐nanoparticle‐bound biochemically relevant 5‐thio(2‐nitrobenzoic acid) and 4‐mercaptophenylboronic acid reporter molecule distributions at a surface of novel SERS‐active metamaterial junctions were recorded at Raman resonant two‐color picosecond excitation of the surface in the NIR spectral range employing a scanning confocal laser‐based micro‐CARS spectrometer. The metamaterial represents Au‐nanoparticles immobilized on a nanostructured CeO2 faceted dielectric film deposited on a thin Al sublayer. Laser powers not deteriorating the molecules/Au‐NP conjugates were sufficient to generate strong SECARS signals.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.5333