Resonant surface-enhanced Raman scattering by optical phonons in a monolayer of CdSe nanocrystals on Au nanocluster arrays

2016 ◽  
Vol 370 ◽  
pp. 410-417 ◽  
Author(s):  
Alexander G. Milekhin ◽  
Larisa L. Sveshnikova ◽  
Tatyana A. Duda ◽  
Ekaterina E. Rodyakina ◽  
Volodymyr M. Dzhagan ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Cdse Nanocrystals ◽  
Optical Phonons ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

scholarly journals Surface-enhanced Raman scattering by colloidal CdSe nanocrystal submonolayers fabricated by the Langmuir–Blodgett technique

2015 ◽  
Vol 6 ◽  
pp. 2388-2395 ◽  
Author(s):  
Alexander G Milekhin ◽  
Larisa L Sveshnikova ◽  
Tatyana A Duda ◽  
Ekaterina E Rodyakina ◽  
Volodymyr M Dzhagan ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Cdse Nanocrystals ◽  
Minimal Distance ◽  
Optical Phonons ◽  
Langmuir Blodgett ◽  
Sers Signal ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We present the results of an investigation of surface-enhanced Raman scattering (SERS) by optical phonons in colloidal CdSe nanocrystals (NCs) homogeneously deposited on both arrays of Au nanoclusters and Au dimers using the Langmuir–Blodgett technique. The coverage of the deposited NCs was less than one monolayer, as determined by transmission and scanning electron microscopy. SERS by optical phonons in CdSe nanocrystals showed a significant enhancement that depends resonantly on the Au nanocluster and dimer size, and thus on the localized surface plasmon resonance (LSPR) energy. The deposition of CdSe nanocrystals on the Au dimer nanocluster arrays enabled us to study the polarization dependence of SERS. The maximal SERS signal was observed for light polarization parallel to the dimer axis. The polarization ratio of the SERS signal parallel and perpendicular to the dimer axis was 20. The SERS signal intensity was also investigated as a function of the distance between nanoclusters in a dimer. Here the maximal SERS enhancement was observed for the minimal distance studied (about 10 nm), confirming the formation of SERS “hot spots”.

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