Document Details

Document Type : Thesis 
Document Title :
Synthesis and Optical Properties of Multicolored Fluorescent Quantum Dots
توليف ودراسة الخصائص البصرية لنقاط كمية ذات اشعاع متعدد الالوان
 
Subject : physics department 
Document Language : Arabic 
Abstract : Semiconductor quantum dots have attracted the great interest of the scientific community along the past two decades due to their promising applications as powerful fluorescent probes and building blocks of novel biosensors. This thesis presents several approaches about the synthesis of highly luminescence water soluble CdSe quantum dots. Un-capped CdSe and functionalized 2-mercaptoethanol/CdSe quantum dots were synthesized by colloidal chemistry in water medium at different temperatures. The structure and morphology of these quantum dots were characterized by XRD, TEM and EDX. The results depicted that these quantum dots have a single crystalline cubic structure with high purity. It was also found that the particle sizes of functionalized CdSe quantum dots have much smaller size than that of un-capped ones. This means that the 2-mercaptoethanol playing a vital role for controlling the growth of quantum dots during the whole reaction. The luminescence measurements showed that the functionalized CdSe quantum dots have high fluorescence intensity with narrow and symmetric emission profile compared with un-capped CdSe. The influence of metal ions as well as DNA on the fluorescence intensity has been also studied. The results showed that the Ca ions enhanced the fluorescence intensity, while DNA quenched the fluorescence intensity. This means that functionalized CdSe quantum dots can be used as a promising fluorescence probe sensor for Ca ions as well as DNA. 
Supervisor : Dr. Saud J. Yaghmour 
Thesis Type : Master Thesis 
Publishing Year : 1433 AH
2012 AD 
Co-Supervisor : Dr. Waleed E. Mahmoud 
Added Date : Saturday, June 23, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أمل محمد العمريAl-Amri, Amal MohammedResearcherMaster 

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