Publications

2007

• Identification of fullerene-like CdSe nanoparticles from optical spectroscopy calculations
  
  • Botti Silvana
  • Miguel A. L. Marques
  Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2007, 75, pp.035311. Semiconducting nanoparticles are the building blocks of optical nanodevices as their electronic states, and therefore light absorption and emission, can be controlled by modifying their size and shape. CdSe is perhaps the most studied of these nanoparticles, due to the efficiency of its synthesis, the high quality of the resulting samples, and the fact that the optical gap is in the visible range. In this article, we study light absorption of CdSe nanostructures with sizes up to 1.5 nm within density functional theory. We study both bulk fragments with wurtzite symmetry and fullerene-like core-cage structures. The comparison with recent experimental optical spectra allows us to confirm the synthesis of these fullerene-like CdSe clusters. (10.1103/PhysRevB.75.035311)
  DOI : 10.1103/PhysRevB.75.035311
• Transformation of graphite into nanodiamond following extreme electronic excitations
  
  • Dunlop A.
  • Jaskierowicz G.
  • Ossi P. M.
  • Della Negra S.
  Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2007, 76, pp.155403. Graphite targets have been irradiated at 90 K and 300 K with 850 MeV and 6 GeV lead ions and with 20–30 MeV fullerene cluster ions in a large range of fluences. Damage creation was studied both by transmission electron microscopy and Raman spectroscopy. The very strong energy density deposited in electronic processes generates a highly excited region around the projectile path. The relaxation of the deposited energy via hydrodynamic expansion and shock-wave propagation leads to the formation of small defective graphitic domains and of nanocrystalline diamond particles. (10.1103/PhysRevB.76.155403)
  DOI : 10.1103/PhysRevB.76.155403