Strain Effects on the Band Gap and Diameter of CdSe Core and CdSeZnS CoreShell Quantum Dots at Any Temperature
Joint Authors
Karim, Md. Rezaul
Balaban, Mesut
Ünlü, Hilmi
Source
Advances in Materials Science and Engineering
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-09-22
Country of Publication
Egypt
No. of Pages
10
Abstract EN
We present the results of an experimental study about strain effects on the core band gap and diameter of spherical bare CdSe core and CdSe/ZnS core/shell quantum dots (QDs) synthesized by using a colloidal technique at varying temperatures.
Structural characterizations were made by using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) techniques.
Optical characterizations were made by using UV-Vis absorption and fluorescence emission spectroscopies.
The XRD analysis suggests that the synthesized bare CdSe core and CdSe/ZnS core/shell QDs have zinc blende crystal structure.
HRTEM results indicate that the CdSe core and CdSe/ZnS QDs have average particle sizes about 3.50 nm and 4.84 nm, respectively.
Furthermore, compressive strain causes an increase (decrease) in the core band gap (diameter) of spherical CdSe/ZnS core/shell QDs at any temperature.
An elastic strain-modified effective mass approximation (EMA) predicts that there is a parabolic decrease (increase) in the core band gap (diameter) of QDs with temperature.
The diameter of spherical bare CdSe core and CdSe/ZnS core/shell QDs calculated by using the strain-modified EMA, with core band gap extracted from absorption spectra, are in excellent agreement with the HRTEM data.
American Psychological Association (APA)
Karim, Md. Rezaul& Balaban, Mesut& Ünlü, Hilmi. 2019. Strain Effects on the Band Gap and Diameter of CdSe Core and CdSeZnS CoreShell Quantum Dots at Any Temperature. Advances in Materials Science and Engineering،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1119852
Modern Language Association (MLA)
Karim, Md. Rezaul…[et al.]. Strain Effects on the Band Gap and Diameter of CdSe Core and CdSeZnS CoreShell Quantum Dots at Any Temperature. Advances in Materials Science and Engineering No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1119852
American Medical Association (AMA)
Karim, Md. Rezaul& Balaban, Mesut& Ünlü, Hilmi. Strain Effects on the Band Gap and Diameter of CdSe Core and CdSeZnS CoreShell Quantum Dots at Any Temperature. Advances in Materials Science and Engineering. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1119852
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1119852