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Graphene

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Graphene is the most fascinating material ever fabricated. outstanding and unique features of graphene has brought the 2008 Nobel prize for its discoverers. amongst its various potentials, one of the most intriguing one is electronic structure. (this presentation had been a class project and may arise vagueness without presenter's notes or speech.)

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Graphene

  1. 1. Graphene: Production, Properties and Applications Presented By: Ardalan Hayati Far 1
  2. 2. Carbon allotropes sp3 Carbon forms/ Hybridization sp2 sp sp3 - sp2 2
  3. 3. Carbon allotropes •sp3 QuickTime™ and a GIF decompressor are needed to see this picture. The Darya-I-Nur Diamond Unit cell of the diamond cubic crystal structure 3
  4. 4. Carbon allotropes •sp (−C≡C−)n 4
  5. 5. Carbon allotropes •sp3 - sp2 5
  6. 6. Carbon allotropes •sp2 Graphite Fullerene Graphene 6
  7. 7. 7
  8. 8. Graphene and its descendants 8
  9. 9. Production Techniques • Exfoliation • Epitaxy ★ Silicon carbide ★ Metal substrates 9
  10. 10. Production Techniques • Exfoliation 10
  11. 11. Production Techniques • Exfoliation Graphene on SiO2 Graphene suspension in chloroform 11
  12. 12. Production Techniques • Epitaxy Metal substrate 12
  13. 13. Production Techniques • Epitaxy Silicon carbide 13
  14. 14. Properties • Structure • Mechanical • Chemical • Optical • Thermal and thermoelectric • Electronic 14
  15. 15. Properties: Structure TEM Optical micrograph 15
  16. 16. Properties: Mechanical Pressure strengh AFM 16
  17. 17. Properties: Chemical NO2 molecule on graphene surface 17
  18. 18. Properties: Optical 18
  19. 19. Properties: Thermal and thermoelectric 19
  20. 20. Properties: Electronic Why graphene is strange? Electrons in graphene = Charge carriers Electrons in graphene have zero effective mass. For graphene we use Dirac equation! not Schrodinger equation. 20
  21. 21. Properties: Electronic Graphene lattice Band structure diagram 21
  22. 22. Band structure diagram Chemist Physicist Localized electrons Delocalized electrons MO Diagram Band Structure Diagram Molecular Orbital Wavevector Chemical bonding Potentials Qualitative (Intuitive) Quantitative (Mathematical) 22
  23. 23. Band structure diagram Bloch function 23
  24. 24. Band structure diagram: An example The Band Structure of a 1D chain of H atoms 24
  25. 25. Graphene Band Structure High symmetry points 25
  26. 26. Graphene Band Structure 26
  27. 27. Graphene Band Structure 27
  28. 28. Graphene Band Structure 28
  29. 29. So What?! Graphene is a gapless semiconductor. Graphene is a metal without overlapping. Richard Feynman 29
  30. 30. 30
  31. 31. Applications Visit this link: http://www.graphene.manchester.ac.uk/future/ 31
  32. 32. Thanks for your attention Questions? 32 Ardalan Hayati Far Dey 1392

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