Micro-Raman and micro-photoluminescence study of bio-conjugated core–shell CdSe/ZnS nanocrystals

Borkovska, L.; Korsunska, N.; Stara, T.; Kolomys, O.; Strelchuk, V. V.; Rachkov, O.; Kryvko, Andriy

doi:10.1016/j.physb.2014.05.003

Cited by 1 publication

(2 citation statements)

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“…After adding the first ZnS layer to the CdSe·S NPL, the CdS-attributed peak at 280 cm –1 is shifted toward 285 cm –1 and becomes wider with a large low-energy shoulder (LES) extending to 230 cm –1 . After adding a second ZnS layer to the nanostructure, this peak becomes thinner and is further shifted to 290 cm –1 , close to the ZnS shell-related 300 cm –1 observed in ref . It is also in accordance with the data reported in refs and , where the authors observed the blue shift of this sulfidelike peak with an increasing proportion of Zn content in Cd(Zn)S x Se 1– x nanoparticles.…”

Section: Resultssupporting

confidence: 90%

“…The peaks are prone to be shifted from their position in the bulk spectra due to the structural distortions at the CdS–ZnS interface and the undercoordinated S atoms at the shell surface. Similar to what was observed in ref , the peak group at 350 cm –1 cannot be observed in the spectra reported in Figure , and the peak at around 280 cm –1 overlaps with the CdS LO peak.…”

Section: Resultssupporting

confidence: 89%

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Combined Computational and Experimental Study of CdSeS/ZnS Nanoplatelets: Structural, Vibrational, and Electronic Aspects of Core–Shell Interface Formation

et al. 2018

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In the past few years, core−shell nanoparticles have opened new perspectives for the optoelectronic applications of semiconductor quantum dots. In particular, it has become possible to localize electrons in either part of these heterostructures. Understanding and controlling this phenomenon require a thorough characterization of the interfaces. In this study, we prepared quasi-2D CdSeS/ZnS core−shell nanoplatelets (NPLs) by colloidal atomic layer deposition. This technique allows fine control over the quantum confinement, the surfaces, and the interfaces. The layer-by-layer formation of a the ZnS shell around the CdSeS core was monitored using UV−vis absorption, XRD, and Raman spectroscopy. The measured band gaps and structural distortions were compared with results obtained from density functional theory (DFT) calculations. Modeling has also shown that 34% of the photoexcited electrons are delocalized into the ZnS shell. The herein presented combined modeling and experimental characterization strategy is of general interest since it can be applied to a large choice of layered semiconductor heterostructures in optoelectronics. The present approach paves the way for the synthesis of nanocrystals with precisely engineered properties for light-emitting diodes and solar cells.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%