Browsing by Author "Himcinschi, Cameliu"

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Raman Scattering for Probing Semiconductor Nanocrystal Arrays with a Low Areal Density
(2012-08-16)
Milekhin, Alexander G.
;
Yeryukov, Nikolay A.
;
Sveshnikova, Larisa L.
;
Duda, Tatyana A.
;
Kosolobov, Sergey S.
We present a study of resonant and surface enhanced Raman scattering by arrays of nanocrystals (cadmium sulfide CdS, lead selenide PbSe, and zinc oxide ZnO) with various areal density fabricated by using the Langmuir-Blodgett technique and colloidal chemistry. Resonant Raman scattering by transverse, longitudinal, and surface optical (TO, LO, and SO) phonons and their overtones up to ninth order was achieved for nanocrystal (NC) arrays by adjusting the laser energy to that of the interband transitions. The resonance enhancement allowed a Raman response from arrays of NCs with a low areal density (down to 10 PbSe NCs per 1 mu m(2)) to be measured. An enhancement of Raman scattering by LO and SO modes in CdS NC arrays with a low areal density by a factor of about 730 was achieved due to the resonant surface enhanced Raman scattering effect.
Raman Scattering for Probing Semiconductor Nanostructures: from Nanocrystal Arrays towards a Single Nanocrystal
(2013-01-01)
Milekhin, Alexander
;
Yeryukov, Nikolay
;
Sveshnikova, Larisa
;
Duda, Tatyana
;
Kosolobov, Sergey
We present a study of resonant and surface enhanced Raman scattering (SERS) by arrays of CdS, CuS, ZnO, and PbSe nanocrystals (NCs) with various areal density. Resonant Raman scattering by optical phonons and their overtones up to 9th order was observed for ZnO NC arrays by adjusting the laser energy to that of the interband transitions. The resonance enhancement allowed a Raman response from arrays of NCs with a low areal density (down to 10 PbSe NCs per 1 mu m(2)) to be measured. An enhancement of Raman scattering by LO modes in CdS NC arrays by a factor of about 730 due to the resonant SERS effect was demonstrated. SERS effect by optical phonons in CuS NCs with ultra-low areal density formed on laterally ordered arrays of Au nanoclusters was observed.