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SUMMARY:Creating\, probing and removing defects in nanocarbons: An ab init
 io study
DTSTART:20100217T150000
DTSTAMP:20260510T025812Z
UID:b8f61c4c408883b2ec0cf3381677e84f730fc377ce0c639d2b826706
CATEGORIES:Conferences - Seminars
DESCRIPTION:Professeur David Tománek\nDefects in carbon nanotubes\, inclu
 ding atomic vacancies and Stone-Wales defects\, are known to significantly
  degrade the stability\, electrical and thermal conductance of these uniqu
 e nanostructures. Location of defects can be detected spectroscopically or
  by probing the topography or local damping using dynamic Atomic Force Mic
 roscopy. Carbon nanotubes exhibit an unusual capability for self-healing b
 y reconstruction at defect sites. Other desirable structural changes may b
 e induced by irradiation with ion beams or light. Particularly promising i
 s nano-engineering with monochromatic light\, more precisely with speciall
 y shaped laser pulses. The excited-state dynamics following a photo-excita
 tion is unusually long-lived (see Fig. 1) and differs strongly from ground
 - state dynamics. It may be used to selectively desorb impurity atoms (see
  Fig. 2)\, convert graphite to diamond\, or to photo-detach graphene from 
 graphite. Since direct observation of atomic-scale processes following spe
 cific local perturbations is very hard by experimental means\, computer si
 mulations are a welcome alternative to gain insight into the underlying Ph
 ysics.
LOCATION:Batiment Physique salle (3ème étage) PHH331
STATUS:CONFIRMED
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