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  1. Article: Chemical Contribution to SERS Enhancement: An Experimental Study on a Series of Polymethine Dyes on Silver Nanoaggregates

    Kneipp, Katrin

    The Journal of Physical Chemistry C. 2016 Sept. 22, v. 120, no. 37

    2016  

    Abstract: We investigate the chemical contribution to SERS on a series of polymethine dyes attached to silver nanoparticles in aqueous solution exploiting a total average enhancement level of 10⁷–10⁸. On top of uniform plasmonic and molecular resonance enhancement, ...

    Abstract We investigate the chemical contribution to SERS on a series of polymethine dyes attached to silver nanoparticles in aqueous solution exploiting a total average enhancement level of 10⁷–10⁸. On top of uniform plasmonic and molecular resonance enhancement, we obtain changes in SERS signal levels and particularly changes in relative scattering intensities for selected Raman lines in the SERS spectra of very similar polymethine dyes. This variation in chemical SERS enhancement within the dye series correlates with the generation of dye radicals of the same dyes on photographic silver halides reported in the literature, where the dye radicals were determined by ESR spectroscopy. The correlation between these two experimentally independent observables suggests transfer and/or exchange/sharing of electrons between the metal and the molecule as basic process for chemical SERS enhancement, where the efficiency of the process depends on the molecular structure. Despite that the main contribution in SERS is caused by plasmonic field enhancement, the chemical contribution to SERS can be a sensitive tool to extract information on interest for processes that rely on charge transfer between surfaces/nanostructures and molecules such as catalysis or spectral sensitization.
    Keywords aqueous solutions ; catalytic activity ; chemical structure ; dyes ; electrons ; free radicals ; halides ; nanosilver ; silver ; spectroscopy
    Language English
    Dates of publication 2016-0922
    Size p. 21076-21081.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021%2Facs.jpcc.6b03785
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Probing plasmonic nanostructures by photons and electrons.

    Kneipp, Katrin / Kneipp, Harald / Kneipp, Janina

    Chemical science

    2015  Volume 6, Issue 5, Page(s) 2721–2726

    Abstract: We discuss recent developments for studying plasmonic metal nanostructures. Exploiting photons and electrons opens up new capabilities to probe the complete plasmon spectrum including bright and dark modes and related local optical fields at subnanometer ...

    Abstract We discuss recent developments for studying plasmonic metal nanostructures. Exploiting photons and electrons opens up new capabilities to probe the complete plasmon spectrum including bright and dark modes and related local optical fields at subnanometer spatial resolution. This comprehensive characterization of plasmonic properties of metal nanostructures provides new basic insight into the fundamental physics of "surface enhanced" spectroscopy in hottest hot spots and enables us to optimize plasmon supported processes and devices.
    Language English
    Publishing date 2015-02-11
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2559110-1
    ISSN 2041-6539 ; 2041-6520
    ISSN (online) 2041-6539
    ISSN 2041-6520
    DOI 10.1039/c4sc03508a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering.

    Kneipp, Katrin / Kneipp, Harald

    Beilstein journal of nanotechnology

    2013  Volume 4, Page(s) 834–842

    Abstract: Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single ... ...

    Abstract Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single molecules can provide us with important information about the optical near-field. We discuss one- and two-photon excited surface enhanced Raman scattering at the level of single molecules as a tool for probing the plasmonic near-field of silver nanoaggregates. The experiments reveal enhancement factors of local fields in the hottest hot spots of the near-field and their dependence on the photon energy. Also, the number of the hottest spots and their approximate geometrical size are found. Near-field amplitudes in the hottest spots can be enhanced by three orders of magnitudes. Nanoaggregates of 100 nm dimensions provide one hot spot on this highest enhancement level where the enhancement is confined within less than 1nm dimension. The near-field enhancement in the hottest spots increases with decreasing photon energy.
    Language English
    Publishing date 2013-12-02
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2583584-1
    ISSN 2190-4286
    ISSN 2190-4286
    DOI 10.3762/bjnano.4.94
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Probing the plasmonic near-field by one- and two-photon excited surface enhanced Raman scattering

    Katrin Kneipp / Harald Kneipp

    Beilstein Journal of Nanotechnology, Vol 4, Iss 1, Pp 834-

    2013  Volume 842

    Abstract: Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single ... ...

    Abstract Strongly enhanced and spatially confined near-fields in the vicinity of plasmonic nanostructures open up exciting new capabilities for photon-driven processes and particularly also for optical spectroscopy. Surface enhanced Raman signatures of single molecules can provide us with important information about the optical near-field. We discuss one- and two-photon excited surface enhanced Raman scattering at the level of single molecules as a tool for probing the plasmonic near-field of silver nanoaggregates. The experiments reveal enhancement factors of local fields in the hottest hot spots of the near-field and their dependence on the photon energy. Also, the number of the hottest spots and their approximate geometrical size are found. Near-field amplitudes in the hottest spots can be enhanced by three orders of magnitudes. Nanoaggregates of 100 nm dimensions provide one hot spot on this highest enhancement level where the enhancement is confined within less than 1nm dimension. The near-field enhancement in the hottest spots increases with decreasing photon energy.
    Keywords near-field ; plasmonics ; silver nanoaggregates ; single molecule ; surface-enhanced Raman scattering (SERS) ; Technology ; T ; Chemical technology ; TP1-1185 ; Science ; Q ; Physics ; QC1-999
    Subject code 535
    Language English
    Publishing date 2013-12-01T00:00:00Z
    Publisher Beilstein-Institut
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Single molecule Raman scattering.

    Kneipp, Katrin / Kneipp, Harald

    Applied spectroscopy

    2006  Volume 60, Issue 12, Page(s) 322A–334A

    Language English
    Publishing date 2006-12
    Publishing country United States
    Document type Journal Article
    ISSN 0003-7028
    ISSN 0003-7028
    DOI 10.1366/000370206779321418
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Conference proceedings: New approaches in biomedical spectroscopy

    Kneipp, Katrin

    (ACS symposium series ; 963)

    2007  

    Institution American Chemical Society. / Division of Analytical Chemistry
    Event/congress Pacifichem 2005 (2005, HonoluluHawaii)
    Author's details Katrin Kneipp, editor ... [et al.] ; sponsored by the ACS Division of Analytical Chemistry
    Series title ACS symposium series ; 963
    Keywords Spectrum analysis ; Biomolecules/Spectra
    Language English
    Size xvi, 453 p. :, ill. ;, 24 cm.
    Publisher American Chemical Society ; Distributed by Oxford University Press
    Publishing place Washington, DC
    Document type Book ; Conference proceedings
    Note "Result of a symposium entitled New Approaches in Biomedical Spectroscopy as part of the Pacifichem 2005 Conference held in December 2005 in Honolulu, Hawaii"--Pref.
    ISBN 9780841274372 ; 0841274371
    Database NAL-Catalogue (AGRICOLA)

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  7. Book ; Conference proceedings: New approaches in biomedical spectroscopy

    Kneipp, Katrin

    (ACS symposium series ; 963)

    2007  

    Institution American Chemical Society. / Division of Analytical Chemistry
    Event/congress International Chemical Congress of Pacific Basin Societies (2005, HonoluluHawaii)
    Author's details Katrin Kneipp, editor ... [et al.] ; sponsored by the ACS Division of Analytical Chemistry
    Series title ACS symposium series ; 963
    MeSH term(s) Spectrophotometry, Infrared ; Molecular Structure ; Spectrum Analysis, Raman
    Language English
    Size xvi, 453 p. :, ill. ;, 24 cm.
    Publisher American Chemical Society ; Distributed by Oxford University Press
    Publishing place Washington, DC
    Document type Book ; Conference proceedings
    Note "Result of a symposium entitled New Approaches in Biomedical Spectroscopy as part of the Pacifichem 2005 Conference held in December 2005 in Honolulu, Hawaii"--Pref.
    ISBN 9780841274372 ; 0841274371
    Database Catalogue of the US National Library of Medicine (NLM)

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  8. Book ; Conference proceedings: New approaches in biomedical spectroscopy

    Kneipp, Katrin

    (ACS symposium series ; 963)

    2007  

    Institution American Chemical Society / Division of Analytical Chemistry
    Event/congress Pacifichem Conference (2005, HonoluluHawaii) ; Symposium entitled "New approaches in biomedical spectroscopy" (2005.12, HonoluluHawaii)
    Author's details sponsored by the ACS Division of Analytical Chemistry. Katrin Kneipp, ed
    Series title ACS symposium series ; 963
    Keywords Biomolecules/Spectra ; Spectrum analysis/Congresses
    Language English
    Size XVI, 453 S.
    Publisher American Chemical Soc
    Publishing place Washington, DC
    Document type Book ; Conference proceedings
    ISBN 9780841274372 ; 0841274371
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article: Templated green synthesis of plasmonic silver nanoparticles in onion epidermal cells suitable for surface-enhanced Raman and hyper-Raman scattering.

    Espina Palanco, Marta / Bo Mogensen, Klaus / Gühlke, Marina / Heiner, Zsuzsanna / Kneipp, Janina / Kneipp, Katrin

    Beilstein journal of nanotechnology

    2016  Volume 7, Page(s) 834–840

    Abstract: We report fast and simple green synthesis of plasmonic silver nanoparticles in the epidermal cells of onions after incubation with AgNO3 solution. The biological environment supports the generation of silver nanostructures in two ways. The plant tissue ... ...

    Abstract We report fast and simple green synthesis of plasmonic silver nanoparticles in the epidermal cells of onions after incubation with AgNO3 solution. The biological environment supports the generation of silver nanostructures in two ways. The plant tissue delivers reducing chemicals for the initial formation of small silver clusters and their following conversion to plasmonic particles. Additionally, the natural morphological structures of the onion layers, in particular the extracellular matrix provides a biological template for the growth of plasmonic nanostructures. This is indicated by red glowing images of extracellular spaces in dark field microscopy of onion layers a few hours after AgNO3 exposure due to the formation of silver nanoparticles. Silver nanostructures generated in the extracellular space of onion layers and within the epidermal cell walls can serve as enhancing plasmonic structures for one- and two-photon-excited spectroscopy such as surface enhanced Raman scattering (SERS) and surface enhanced hyper-Raman scattering (SEHRS). Our studies demonstrate a templated green preparation of enhancing plasmonic nanoparticles and suggest a new route to deliver silver nanoparticles as basic building blocks of plasmonic nanosensors to plants by the uptake of solutions of metal salts.
    Language English
    Publishing date 2016-06-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2583584-1
    ISSN 2190-4286
    ISSN 2190-4286
    DOI 10.3762/bjnano.7.75
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Book: Surface - enhanced Raman scattering

    Kneipp, Katrin

    physics and applications

    (Topics in applied physics ; 103)

    2006  

    Author's details Katrin Kneipp ... (eds.)
    Series title Topics in applied physics ; 103
    Keywords Raman effect, Surface enhanced ; Surfaces (Physics) ; Oberflächenverstärkter Raman-Effekt
    Language English
    Size XVII, 464 S., Ill., graph. Darst., 235 mm x 155 mm
    Publisher Springer
    Publishing place Berlin u.a.
    Document type Book
    Note Literaturangaben
    ISBN 3540335668 ; 9783540335665
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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