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 ID: 436338
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Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.
In the name of Allah,
the most Gracious, the most MercifulSlide2
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 SalmanPresented to: Faculty of Physics Department Date: May 11, 2015/ Rajab 22, 1436Slide3
3 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA.ContentsSection No. 1 AbstractSection No. 2 Introduction Section No. 3 Methods & Materials
Section No. 4 Results & ConclusionsSlide4
Abstract4 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. Slide5
Introduction5 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
Solid
Color
Yellow
Group
II–VI
Crystal structure
Hexagonal
Band gap
2.42 eV or 512 nmSlide6
Methods6 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA. Synthesis technique: Chemical vapor deposition (CVD) CdS powder: 1gHeating temperature: 750 °C Constant Time: 30 min Carrier Gas: ArSlide7
Results1) Morphology & Emission Images2) XRD
3) PL
7 Materials Science Laboratory, Department of Physics, College of Science,
Az Zulfi, Majmaah University, KSA.Slide8
Morphology & Emission Images8 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.Slide9
XRD Results9 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.Slide10
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.Slide11
Conclusion11 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.Slide12
Acknowledgement12 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. Slide13
13 Materials Science Laboratory, Department of Physics, College of Science, Az Zulfi, Majmaah University, KSA. Thanks for your attention