<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This paper attempts to describe an effective method for producing a composite of quantum dots consisting of CdSe (core) with CdS (shell). This nanoparticles composite was synthesized from modified organometallic precursors. The sizes of the nanoparticles were estimated from X-ray diffraction data using Debye-Scherer formula and compared with high resolution electron microscopy (HRTEM) and optical spectra. The shape of CdSe/CdS NPs is nearly spherical and revels that the CdS shell with the thickness ~0.6 nm almost fully covers the CdSe core (higher contrast). Using UV-Vis spectroscopy, a systematic red shift in the absorption and emission spectra was observed after the deposition of CdS which confirms the shell growth over the CdSe core. In the CdSe/CdS core/shell structure, the holes are confined to the core, while the electrons are delocalized as a result of similar electron affinities of the core and the shell. The increased time of synthesis resulted in shell thickness increase. The observed properties of prepared CdSe/CdS QDs demonstrate the capability of the nanocomposite for using in the optoelectronics and photonics devices.</p></abstract>

This paper attempts to describe an effective method for producing a composite of quantum dots consisting of CdSe (core) with CdS (shell). This nanoparticles composite was synthesized from modified organometallic precursors. The sizes of the nanoparticles were estimated from X-ray diffraction data using Debye-Scherer formula and compared with high resolution electron microscopy (HRTEM) and optical spectra. The shape of CdSe/CdS NPs is nearly spherical and revels that the CdS shell with the thickness ~0.6 nm almost fully covers the CdSe core (higher contrast). Using UV-Vis spectroscopy, a systematic red shift in the absorption and emission spectra was observed after the deposition of CdS which confirms the shell growth over the CdSe core. In the CdSe/CdS core/shell structure, the holes are confined to the core, while the electrons are delocalized as a result of similar electron affinities of the core and the shell. The increased time of synthesis resulted in shell thickness increase. The observed properties of prepared CdSe/CdS QDs demonstrate the capability of the nanocomposite for using in the optoelectronics and photonics devices.

Synthesis and optical properties of CdSe/CdS core/shell nanocrystals

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Synthesis and optical properties of CdSe/CdS core/shell nanocrystals"}

This paper attempts to describe an effective method for producing a composite of quantum dots consisting of CdSe (core) with CdS (shell). This nanoparticles...

Synthesis and optical properties of CdSe/CdS core/shell nanocrystals

Publié en ligne: 02 août 2019

Pages: 149 - 157

Reçu: 29 déc. 2016

Accepté: 03 oct. 2018

DOI: https://doi.org/10.2478/msp-2019-0034

Mots clés
CdSe/CdS core/shell, quantum dots, optical spectra, HRTEM, X-rays

© 2019 A. Gadalla et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Synthesis and optical properties of CdSe/CdS core/shell nanocrystals

Publié en ligne: 02 août 2019

Pages: 149 - 157

Reçu: 29 déc. 2016

Accepté: 03 oct. 2018

DOI: https://doi.org/10.2478/msp-2019-0034

Mots clésCdSe/CdS core/shell, quantum dots, optical spectra, HRTEM, X-rays

© 2019 A. Gadalla et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
CdSe/CdS core/shell, quantum dots, optical spectra, HRTEM, X-rays