Header menu link for other important links
X
Appearance of SERS activity in single silver nanoparticles by laser-induced reshaping
Kamalesh Chaudhari, Tripti Ahuja, Vasanthanarayan Murugesan, Vidhya Subramanian, Mohd Azhardin Ganayee,
Published in Royal Society of Chemistry
2019
PMID: 30534777
Volume: 11
   
Issue: 1
Pages: 321 - 330
Abstract
We report simultaneous plasmonic scattering and Raman spectroscopic observations of single citrate capped silver nanoparticles (AgNPs) which exhibit surface enhanced Raman scattering (SERS) upon meeting specific conditions induced by laser (532 nm) exposure. We show that nanoparticles which are not initially SERS active become SERS active by laser-induced reshaping/reorientation. A set-up developed for these observations enabled in situ high speed time-lapse characterization using plasmonic and Raman spectroscopies in conjunction with dark-field microscopy (DFM). Changes in the AgNPs were confirmed by monitoring plasmonic scattering spectra and DFM images. Time-lapse observations have shown that laser-induced changes in the plasmonic properties of AgNPs resulted in the appearance of SERS. Spectral matching between plasmon resonance and downward molecular vibronic transitions for molecules adsorbed on the surface of plasmonic nanomaterials is attributed to the nanoparticle SERS. We have further shown that the release of silver ions by silver nanoparticles can be the probable reason for their plasmonic changes. Gold nanoparticles inert to such mild (850 μW, 532 nm) laser-induced changes do not exhibit the appearance of SERS. © The Royal Society of Chemistry.
About the journal
JournalData powered by TypesetNanoscale
PublisherData powered by TypesetRoyal Society of Chemistry
ISSN20403364
Open AccessNo
Concepts (17)
  •  related image
    Gold nanoparticles
  •  related image
    Metal ions
  •  related image
    Metal nanoparticles
  •  related image
    Plasmonics
  •  related image
    Plasmons
  •  related image
    Raman scattering
  •  related image
    Raman spectroscopy
  •  related image
    Surface scattering
  •  related image
    DARK FIELD MICROSCOPY
  •  related image
    Plasmon resonances
  •  related image
    Plasmonic properties
  •  related image
    Raman spectroscopic
  •  related image
    Silver nanoparticles (agnps)
  •  related image
    SPECTRAL MATCHINGS
  •  related image
    Surface enhanced raman scattering (sers)
  •  related image
    VI-BRONIC TRANSITIONS
  •  related image
    Silver nanoparticles