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CdS:Mn and CdS:O Nanoparticles Growth via Thermochemical and Microwave Methods and Studding the Photoluminescence Properties

Amrollahi Biuki, Rezvaneh | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39532 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Taghavinia, Nima
  7. Abstract:
  8. The optimization of CdS photoluminescence nanoparticles which has been considered as one of the most important II-VI semiconductors has been studied here. As the first step, synthesis parameters effect on CdS:Mn photoluminescence intensity has been regarded by thermochemical method. Effect of parameters like pH solution, heating time and capping agent concentration on photoluminescence of these materials has been experimented. What seemed so important was reaching nanoparticles with suitable nano size and nano structure and having highly photoluminescence intensity. Observing the good effect of Oxygen on photoluminescence of CdS nanoparticles leaded us to concentrate on synthesizing CdS:O highly photoluminescence nanoparticles. First, we synthesized these nanoparticles by thermochemical methods in different pH and heating time scales and we faced different phenomenon. These particles which have been synthesized in at least one hour heating time, showed the best photoluminescence intensity with permanence shorter time in a two minutes heating time while having suitable crystalline size, structure and desirable amount of material. After gaining such photoluminescence intensity by thermochemical methods, we decided to replace this method by simpler method with shorter time and lower cost, in order to producing CdS:O NPs with more material amount for different applications. Therefore we started using microwave. By using a household microwave and changing different conditions we could synthesize CdS:O nanoparticles without necessity of flowing oxygen and only using the available oxygen in air with higher photoluminescence intensity in lower time of thirty seconds and simpler way in compare to thermochemical method. Since we could synthesize the particles simpler and in shorter times, we continued to synthesize other particles like CdS:O / ZnS and CdS:Mn to reach better photoluminescence. After experimenting different conditions we could synthesize CdS:O / ZnS core-shell nanoparticles by irradiation method so increasing photoluminescence twice than before. Providing proper conditions we synthesized CdS:Mn nanoparticles via microwave.


  9. Keywords:
  10. Nanoparticles ; Microwave ; Luminescent Nanocrystals ; Semiconductor Cadmium Sulfide Nanoparticles ; Thermomechanical Processing

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