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Colloidal Synthesis of CdSe Nanoparticles and the Influence of Processing Parameters on Growth kinetics

Mansouri, Hamid | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44933 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Asgari, Sirous
  7. Abstract:
  8. Over the past two decades, several studies have been investigated on synthesis and properties of semi-conductor quantum dots because of their applications in sensors, LEDs, detectors, solar cells, etc. One of challenging issues in synthesizing these nano-particles is their size distribution. In this study, Cadmium Selenide was synthesized by the method of colloidal synthesis. X-ray diffraction showed that the crystalline nano-particles have wurtzite structure. For obtaining a uniform size distribution, effect of various parameters such as molar ratio of components and reaction temperature on the growth kinetics of these particles, were studied. Results showed that molar ratio of Selenium to Cadmium is very influential in procedure of growth and with increasing this ratio up to five, the distribution becomes more uniform and the peaks observed in absorption spectrum are sharp but with increasing this ratio again the size distribution and the peaks become wide. Also increasing oleic acid causes an increase in the rate of Oswald Ripening process which with the advent of this mechanism the size distribution becomes wide. Increasing the temperature also accelerated the growth of particles and made the size distribution of particles more uniform
  9. Keywords:
  10. Growth Kinetics ; Quantum Dots ; Semiconductor Cadmium Sulfide Nanoparticles ; Colloidal Synthesis ; Cadmium Selenides

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