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Manipulation of Two-Dimensional Nanosheets Tin Sulfide by Solvothermal Process

Mansouri, Iman | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54439 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad; Mohammadi, Mohammad Reza
  7. Abstract:
  8. Tin sulfide with an energy gap of about 1.1 ev is a semiconductor suitable for applications such as solar cells, lithium-ion batteries, photocatalysts and other semiconductor-based devices. There are several methods for synthesizing this semiconductor at the nanometer scale, among which the solvothermal method is an efficient, controllable and inexpensive method. By precisely controlling the parameters of this process, two-dimensional tin sulfide nanosheets with high purity and desirable morphology can be produced. In this research, tin sulfide has been synthesized by solvothermal / hydrothermal chemical method and its metallurgical properties have been studied. Effect of solvothermal process parameters such as type of sulfur precursor (thiourea and thioacetamide), tin precursor (two-tin tin chloride and five-tin tin chloride), solvent type (two solvents ethanolamine and three ethylene tetra amine), on structure, morphology, chemical composition and The product has been reviewed. These product properties have been studied using SEM, UV-VIS, XRD, FTIR analyzes. It was concluded that it is possible to synthesize tin sulfide in SnS, SnS_2 and Sn_2 S_3 phases using the solvothermal process. The two solvents ethanolamine and three ethylene tetraamine with the parameters of boiling point, dielectric constant and the number of their ligand teeth to form a complex, will affect the final morphology of tin sulfide in dense nanosheets or facilitate the one-dimensional growth of these nanosheets. In the case of sulfur precursors, it is possible to synthesize tin oxide if the molar ratio with the tin precursors is not observed. It is also possible to synthesize tin sulfide in its various phases using thiourea and thioacetamide and by selecting the appropriate molar ratio with the tin precursor. Also, thiourea and thioacetamide, with their differences in sulfur ion release rate, will affect the germination rate of tin sulfide buds and, of course, the final morphology of the product as nanoparticles and dense nanosheets. In the case of tin precursors using tin-chloride, it is possible to synthesize tin sulfide in the SnS phase, and in the case of using tin-chloride by determining its appropriate molar ratio with sulfur precursors, it is possible to synthesize tin sulfide in SnS_2 or Sn_2 S_3 phases. The nucleation mechanism for tin sulfide buds is through the formation of a complex and its reaction, and its growth mechanism is through the growth process. In this research, tin sulfide nanosheets with thicknesses of 65 and 77 nm were well synthesized in Thiourea - Tin(II) chloride dehydrate - ethanolamine system at
    180 ° C for 18 hours
  9. Keywords:
  10. Tin Sulfide ; Solvothermal Method ; Process Parameters ; Morphology ; Solvothermal/Hydrothermal Method

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