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Supported Faceted Gold Nanoparticles with Tunable Surface Plasmon Resonance for NIR‐SERS
Author(s) -
Bianco Giuseppe V.,
Giangregorio Maria M.,
Losurdo Maria,
Capezzuto Pio,
Bruno Giovanni
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201201441
Subject(s) - surface plasmon resonance , materials science , plasmon , raman scattering , colloidal gold , nanoparticle , substrate (aquarium) , nanotechnology , raman spectroscopy , resonance (particle physics) , near infrared spectroscopy , optoelectronics , optics , oceanography , physics , particle physics , geology
A novel dry plasma methodology for fabricating directly stabilized substrate‐supported gold nanoparticle (NP) ensembles for near infrared surface enhanced Raman scattering (NIR SERS) is presented. This maskless stepwise growth exploits Au‐sulfide seeds by plasma sulfidization of gold nuclei to produce highly faceted Au NPs with a multiple plasmon resonance that can be tuned from the visible to the near infrared, down to 1400 nm. The role of Au sulfidization in modifying the dynamics of Au NPs and of the corresponding plasmon resonance is discussed. The tunability of the plasmon resonance in a broad range is shown and the effectiveness as substrates for NIR SERS is demonstrated. The SERS response is investigated by using different laser sources operating both in the visible and in the NIR. SERS mapping of the SERS enhancement factor is carried out in order to evaluate their effectiveness, stability, and reproducibility as NIR SERS substrates, also in comparison with gold NPs fabricated by conventional sputtering and with the state‐of‐the‐art in the current literature.