Surface enhanced Raman scattering by CdS quantum dots

Milekhin, A. G.; Sveshnikova, L. L.; Duda, T. A.; Surovtsev, N. V.; Adichtchev, S. V.; Zahn, Dietrich R. T.

doi:10.1134/s0021364008240053

Cited by 49 publications

(42 citation statements)

References 9 publications

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“…energy dependence of the head-on data. Note that this similarity in the pseudorapidity density and the transverse energy pseudorapidity density is in accordance with the same functional form of the (pseudo)rapidity density distribution obtained either in the longitudinally expanding system considered in the original Landau model or when the development in the transverse direction is included [50][51][52]. From Fig.…”

Section: Multiplicity Centrality Dependencesupporting

confidence: 80%

Multihadron production dynamics exploring the energy balance in hadronic and nuclear collisions

et al. 2016

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The relation of multihadron production in nucleus-nucleus and (anti)proton-proton collisions is studied by exploring the collision-energy and centrality dependencies of the charged particle mean multiplicity in the measurements to date. The study is performed in the framework of the recently proposed effectiveenergy approach which, under the proper scaling of the collision energy, combines the constituent quark picture with Landau relativistic hydrodynamics counting for the centrality-defined effective energy of participants. Within this approach, the multiplicity energy dependence and the pseudorapidity spectra from the most central nuclear collisions are well reproduced. The study of the multiplicity centrality dependence reveals a new scaling between the measured pseudorapidity spectra and the calculations. By means of this scaling, referred to as energy-balanced limiting fragmentation scaling, one reproduces the pseudorapidity spectra for all centralities. The scaling elucidates some differences in the multiplicity and midrapidity density centrality dependence obtained at RHIC and LHC. These findings reveal an inherent similarity in the multiplicity energy dependence from the most central collisions and centrality data. Predictions are made for the mean multiplicities to be measured in proton-proton and heavy-ion collisions at the LHC.

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Section: Multiplicity Centrality Dependencesupporting

confidence: 80%

Multihadron production dynamics exploring the energy balance in hadronic and nuclear collisions

et al. 2016

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“…In the case of organic molecules, single-molecule sensitivity was achieved both by SERS 15,16 and TERS [17][18][19] . These methods were also employed to detect the signal from low amounts of inorganic materials, such as CdS, CdSe, GaN, Cu x S and ZnO [20][21][22][23][24] . Recently, resonant SERS was successfully employed to analyze the anisotropy of the phonon spectrum of a single CdSe nanoplatelet 25 .…”

Section: Introductionmentioning

confidence: 99%

Surface- and tip-enhanced resonant Raman scattering from CdSe nanocrystals

Sheremet

Milekhin

Rodriguez

et al. 2015

Phys. Chem. Chem. Phys.

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Surface- and tip-enhanced resonant Raman scattering (resonant SERS and TERS) by optical phonons in a monolayer of CdSe quantum dots (QDs) is demonstrated. The SERS enhancement was achieved by employing plasmonically active substrates consisting of gold arrays with varying nanocluster diameters prepared by electron-beam lithography. The magnitude of the SERS enhancement depends on the localized surface plasmon resonance (LSPR) energy, which is determined by the structural parameters. The LSPR positions as a function of nanocluster diameter were experimentally determined from spectroscopic micro-ellipsometry, and compared to numerical simulations showing good qualitative agreement. The monolayer of CdSe QDs was deposited by the Langmuir-Blodgett-based technique on the SERS substrates. By tuning the excitation energy close to the band gap of the CdSe QDs and to the LSPR energy, resonant SERS by longitudinal optical (LO) phonons of CdSe QDs was realized. A SERS enhancement factor of 2 × 10(3) was achieved. This allowed the detection of higher order LO modes of CdSe QDs, evidencing the high crystalline quality of QDs. The dependence of LO phonon mode intensity on the size of Au nanoclusters reveals a resonant character, suggesting that the electromagnetic mechanism of the SERS enhancement is dominant. Finally, the resonant TERS spectrum from CdSe QDs was obtained using electrochemically etched gold tips providing an enhancement on the order of 10(4). This is an important step towards the detection of the phonon spectrum from a single QD.

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“…Several experimental techniques including methods of the wet chemistry [3][4][5] or combination of evaporation techniques with wet chemistry [6], colloidal chemistry [7][8][9], preparation of QDs in polymer matrices [10], sputtering techniques [11,12], and sol-gel methods [13] are known to be used for the formation of ZnS and ZnO QDs. Among those the Langmuir-Blodgett (LB) technique is considered as a versatile, relatively simple, fast, and low-cost method for QD fabrication of II-VI and IV-VI materials with controllable QD areal density on different substrates [14][15][16][17][18]. It was established that ZnS and ZnO QDs grown by the LB technique are predominantly formed in a cubic and hexagonal symmetry, respectively [19].…”

Section: Introductionmentioning

confidence: 99%