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

• Autorzy: Gadalla A. , Abd El-Sadek M. S. , Hamood R.

Identyfikatory

DOI

10.2478/msp-2019-0034

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

CdSe/CdS core/shell; quantum dots; optical spectra; HRTEM; X-rays

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2019
• Tom: Vol. 37, No. 2
• Strony: 149--157
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Gadalla A.

• Physics Department, Faculty of Science, Assiut University, Egypt

autor

Abd El-Sadek M. S.

• Nanomaterial Lab., Physics Department, Faculty of Science, South Valley University, Qena, Egypt

autor

Hamood R.

• Physics Department, Faculty of Science, Assiut University, Egypt

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).