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SURFACE NANOSCIENCE

SURFACE NANOSCIENCE. Prof. Lorenzo S. Caputi Surface Nanoscience Group Department of Physics, University of Calabria. Ultra-high vacuum equipments. UHV Laboratory. Materials Laboratory. Scanning tunneling microscopy (STM). Nanoscienza di Superficie - UHV. Low Energy Electron Diffraction.

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SURFACE NANOSCIENCE

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  1. SURFACE NANOSCIENCE Prof. Lorenzo S. Caputi Surface Nanoscience Group Department of Physics, University of Calabria

  2. Ultra-high vacuum equipments UHV Laboratory Materials Laboratory

  3. Scanning tunneling microscopy (STM)

  4. Nanoscienza di Superficie - UHV Low Energy Electron Diffraction X/ray Photoelectron Spectroscopy Auger Electron Spectroscopy

  5. AES, XPS -> surface composition • UPS -> electronic structure • LEED -> long range surface order • EELS, HREELS -> collective electronic properties (plasmons), vibrational properties (phonons, molecular vibrational modes) Main Electron Spectroscopies

  6. Main Scientific Interests • Surface properties of materials • Catalysts • Oxides • Synthesis and study of nanomaterials • Carbon nanotubes • Epitaxial Graphene (bottom-up) • Graphene oxide (top-down)

  7. Why Graphene?

  8. CARBON GRAPHITE DIAMOND 2004: GRAPHENE Physics Nobel Price in 2010 1985: fullerens Chemistry Nobel Prize in 1996 1991: Carbon Nanotubes

  9. GRAPHENE 2010: around 3000 papers around 400 patents

  10. Graphene: basic constituent of fullerens, nanotubes and graphite.

  11. Dirac cones Graphene: tridimensional band structure

  12. Linearity of the dispersion curve at Dirac points Electrons behave as Dirac fermions without mass At low energies, electrons in graphene have a Fermi-Dirac speed of about c/300

  13. Peculiarities of graphene The thinnest material. Highest surface/mass ratio (2600 m2/g). Strongest material (Young modulus 1.0 TPa). Highest current density at room temperature (about 103 times with respect to copper). Highest thermal conductivity (5.3x103 WmK-1). Impermeable to gases. Highest electron mean free path at room temperature (300-500 nm). Highly transparent (absorbs about 2% in the visible).

  14. Graphene production bottom-up top-down

  15. Graphite oxidation in collaboration with ITM-CNR

  16. Graphite oxidation in collaboration with ITM-CNR

  17. Electron Spectroscopy applied to Graphene Oxide 5.8 eV p-plasmon Reflection EELS Intensity (arb. units) 5.0 eV Transmission EELS on single-layer GO Energy loss (eV)

  18. Thank you for your attention

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