Immobilized nanorod assemblies: fabrication and understanding of large area surface-enhanced Raman spectroscopy substrates.
We describe the fabrication of optimized plasmonic substrates in the form of immobilized nanorod assemblies (INRA) for surface-enhanced Raman spectroscopy (SERS). Included are high-resolution scanning electron micrograph (SEM) images of the surface structures, along with a mechanistic description of their growth. It is shown that, by varying the size of support microspheres, the surface plasmon resonance is tuned between 330 and 1840 nm. Notably, there are predicted optimal microsphere sizes for each of the commonly used SERS laser wavelengths of 532, 633, 785, and 1064 nm.
Northwestern University, Department of Chemistry, Evanston, Illinois 60208-3108, United States.
Nathan G
NG
Greeneltch
Martin G
MG
Blaber
Anne-Isabelle
AI
Henry
George C
GC
Schatz
Richard P
RP
Van Duyne
D006046:Gold / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D043942:Nanotubes / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry; D013059:Spectrum Analysis, Raman; D020349:Surface Plasmon Resonance; D013499:Surface Properties
D012834:Silver; D006046:Gold