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

被引：14

作者：

Milekhin, Alexander G. ^{[1
,2
]}

Sveshnikova, Larisa L. ^{[1
]}

Duda, Tatyana A. ^{[1
]}

Rodyakina, Ekaterina E. ^{[1
,2
]}

Dzhagan, Volodymyr M. ^{[3
]}

Sheremet, Evgeniya ^{[4
]}

Gordan, Ovidiu D. ^{[3
]}

Himcinschi, Cameliu ^{[5
]}

Latyshev, Alexander V. ^{[1
,2
]}

Zahn, Dietrich R. T. ^{[3
]}

机构：

[1] AV Rzhanov Inst Semicond Phys, Pr Lavrentjeva 13, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, Pirogov Str 2, Novosibirsk 630090, Russia

[3] Tech Univ Chemnitz, Semicond Phys, D-09107 Chemnitz, Germany

[4] Tech Univ Chemnitz, Solid Surfaces Anal, D-09107 Chemnitz, Germany

[5] TU Bergakad Freiberg, Inst Theoret Phys, D-09596 Freiberg, Germany

来源：

APPLIED SURFACE SCIENCE | 2016年 / 370卷

基金：

俄罗斯科学基金会;

关键词：

Phonons; Surface-enhanced Raman scattering; Nanocrystals; Cadmium selenide; Localized surface plasmon; Au nanoclusters; Au dimers; ZNO QUANTUM DOTS; SPECTROSCOPY; NANOPARTICLES; INTERFACE; SERS;

D O I：

10.1016/j.apsusc.2016.02.185

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Here we present the results on an investigation of resonant Stokes and anti-Stokes surface-enhanced Raman scattering (SERS) by optical phonons in colloidal CdSe nanocrystals (NCs) homogeneously deposited on arrays of Au nanoclusters using the Langmuir-Blodgett technology. The thickness of deposited NCs, determined by transmission and scanning electron microscopy, amounts to approximately 1 monolayer. Special attention is paid to the determination of the localized surface plasmon resonance (LSPR) energy in the arrays of Au nanoclusters as a function of the nanocluster size by means of micro-ellipsometry. SERS by optical phonons in CdSe NCs shows a significant enhancement factor with a maximal value of 2 x 10(3) which depends resonantly on the Au nanocluster size and thus on the LSPR energy. The deposition of CdSe NCs on the arrays of Au nanocluster dimers enabled us to study the polarization dependence of SERS. It was found that a maximal SERS signal is observed for the light polarization along the dimer axis. Finally, SERS by optical phonons was observed for CdSe NCs deposited on the structures with a single Au dimer. A difference of the LO phonon energy is observed for CdSe NCs on different single dimers. This effect is explained as the confinement-induced shift which depends on the CdSe nanocrystal size and indicates quasi-single NC Raman spectra being obtained. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：410 / 417

页数：8

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