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Synthesis and Characterization of Grapheme Foams Fabricated by Chemical Vaporization Deposition

Mahboubi, Sajad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47817 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Akhavan, Omid; Azimirad, Rouhollah
  7. Abstract:
  8. The main purpose of this theses is to synthesize graphene by chemical vapor deposition (CVD) of a hydrocarbon gas such as methane on the nickel foam substrate and then to characterize this kind of graphene. Graphene is a single layer of carbon atoms, discovered in 2004, which has led mankind to new eras in all fields by its extraordinary features such as extra high electron mobility, high thermal conductivity, excellent mechanical strength, optical transparence and extra high specific surface. The advantage of this method compared to other methods is that the graphene generated has a better structural quality. Graphene foam firstly, because of the continuity of the foam structure, has better electrical properties and structural similarity with respect to non-zero band gap in graphene nanoribbon. Better electrical properties and non-zero band gap are unique applications of this structure and it can use in solar cells, electronic devices and also eliminating tumor tissue. Secondly, this type of graphene has higher specific surface that causes better performance of this material in supercapacitors, biosensors and cell growth. In particular, the foam structure due to lack of oxygen atoms is biocompatible structure as well. Since the discovery of graphene scientists have been competing to synthesize single-layer graphene with ideal structural quality by different kinds of methods such as chemical cleavage, micro-mechanical cleavage, exfoliation and chemical vapor deposition. In this project we synthesized graphene by chemical vapor deposition. The special merit of this method in comparison with other methods is to construct graphene with high structural quality. The absence of annoying atoms such as oxygen and also biocompatibility is considered. It means this method can be used in cell growing. In CVD method, we expose nickel foam to a gas such as methane in about 1000 Celsius degrees. In this temperature it is possible for carbon atoms to stick to nickel substrate and to form Sp2 hybrid links after being cold to room temperature. Then by eliminating nickel, graphene can be separated and used in the target surface. Then we characterize the physical features of this kind of graphene. Ramann spectroscopy, scanning electron microscopic images, resistance measurement andX-Ray diffraction are among the tests that we used to check the quality of produced graphene and also to find its physical properties
  9. Keywords:
  10. Chemical Vapor Deposition (CVD) ; Characterization ; Graphene Foam

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