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Chemical Vapor Processing of 2D MoS2 Nanolayers for Next Generation Inoptoelectronic Devices: Characterization and Properties

Sovizi, Saeed | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49422 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. Quite a few methods have been reported to synthesize monolayer MoS2, which has recently attracted scientist attentions. Fully controlled conditions, however, have not been achieved in these methods. In this research, two-dimensional MoS2 nanofilms have been synthesized by Chemical Vaper Deposition (CVD). Layer thickness of synthesized layer and effects of various parameters of used method have been investigated. Although every scientist synthesizes 2D MoS2 at 650°C in the CVD method by using seeds, in this research, it has been proved that MoS2 nanofilms can be produced at 575°C without using any seeds, which leads to lower consumption of time and price and increases the quality of synthesized film. The best conditions for synthesis in CVD furnace were 575°C temperature, 2min Time of, 0.1SCFH carrier gas flow, and 0.05g oxide powder mass. Evaluation of parameters shows that decreasing in temperature, gas flow, and powder mass would generally decrease the layer number of synthesized films. Additionally, commercial wet ball mills used to produce MoS2 nanosheets. The best method in which was wet SPEX having ability to synthesize nanosheets in 2hours. However, Most of ball milling techniques need at least 12 hours to manufacture MoS2 nanosheets. SPEX-produced nanosheets had two caractristic with 64-65nm distance from each other in their UV-Vis spectrum. These peaks were located in the range of 610-701nm. The SPEX parameters were optimized to manufacture the most MoS2 nanosheets. The best conditions were 40%vol water, 0.07g sulfide powder and 0.25% surfactant/powder mass ratio
  9. Keywords:
  10. Raman Spectroscopy ; Chemical Vapor Deposition (CVD) ; Two Dimentional Materials ; Chemical Synthesis ; Molybdenum Desulfide ; Wet Ball Mill

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