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1 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA. In the name of Allah, the most Gracious, the most Merciful
1 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
In the name of Allah, the most Gracious, the most Merciful
2 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
Study of Photoluminescence properties of Sea-
Urchin like CdS nanostructures prepared by CVD
method.
Presented by: Bader Al Salman
Presented to: Faculty of Physics Department
Date: May 11, 2015/ Rajab 22, 1436
3 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
Contents
Section No. 1 Abstract
Section No. 2 Introduction
Section No. 3 Methods & Materials
Section No. 4 Results & Conclusions
Abstract
4 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
In this work, we use chemical vapor deposition (CVD) technique to synthesize CdS 1D-nanostructures (nanobelts & Sea-Urchin like nanostructures).
The morphological characterizations of the product were examined by optical microscope, while optical properties are investigated by Photoluminescence (PL) spectroscopy.
PL spectroscopy helps to identify the crystallinity of the nanostructures.
Introduction
5 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
CdS has been extensively used in electronic and optoelectronic materials with prominent high-technology applications include LEDs, lasers, sensors, etc as shown in Figure.
Name Cadmium(II) Sulfide
Molecular formula
CdS
Phase SolidColor YellowGroup II–VICrystal structure
Hexagonal
Band gap 2.42 eV or 512 nm
Methods
6 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
Synthesis technique: Chemical vapor deposition (CVD)
CdS powder: 1g
Heating temperature: 750 °C
Constant Time: 30 min
Carrier Gas: Ar
Results
1) Morphology & Emission Images
2) XRD
3) PL
7 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
Morphology & Emission Images
8 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
Figure (a) low magnification bright field image of CdS nanobelts, and (b) corresponding emission image under 325 nm laser excitation. (c) low magnification bright field image of Sea-Urchin like CdS nanostructures, (d) individual Sea-Urchin like CdS nanostructure, and (f) corresponding emission image under the same excitation source.
XRD Results
9 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
(a) XRD pattern of CdS nanobelts.
(b) of Sea-Urchin like CdS nanostructures.
XRD pattern concludes Hexagonal structure.
Photoluminescence (PL)
10 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
(a) PL spectrum of CdS nanobelts.
(b) of Sea-Urchin like CdS nanostructures.
Excitation source is 325 nm laser.
Result: PL identified easily defects level in the nanostructures.
Conclusion
11 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
PL of sea-urchin-like CdS nanostructures show only bandedge emission at 512 nm, which means our sea-urchin-like CdS nanostructures posses high quality optical property.
These results are important in the design of future green luminescence, and display devices.
PL technique help us to identify Defects exist in the nanostructures.
Acknowledgement
12 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
I am Thankful to Dr-Thamer Al Harbi (HOD of Physics Department) for providing me experimental facilities.
My deepest thank to Mr. Muhammad Al Bedah & Mr. Raed Al Faleh for helping me in English/Arabic translation.
Special thanks to Dr-Mohammad Abushayeb & Prof. Abdul Majid for their support and help.
13 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
Thanks for your attention
