Surface-enhanced Raman scattering from individual au nanoparticles and nanoparticle dimer substrates.
Surface-enhanced Raman scattering (SERS) intensities for individual Au nanospheres, nanoshells, and nanosphere and nanoshell dimers coated with nonresonant molecules are measured, where the precise nanoscale geometry of each monomer and dimer is identified through in situ atomic force microscopy. The observed intensities correlate with the integrated quartic local electromagnetic field calculated for each specific nanostructure geometry. In this study, we find that suitably fabricated nanoshells can provide SERS enhancements comparable to nanosphere dimers.
Talley
Chad E
CE
Chemistry and Materials Science Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue Livermore California 94550, USA.
Jackson
Joseph B
JB
Oubre
Chris
C
Grady
Nathaniel K
NK
Hollars
Christopher W
CW
Lane
Stephen M
SM
Huser
Thomas R
TR
Nordlander
Peter
P
Halas
Naomi J
NJ
D019281:Dimerization; D006046:Gold / Q000032:analysis / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods*; D018625:Microscopy, Atomic Force; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties
D006046:Gold