BEGIN:VCALENDAR
VERSION:2.0
PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69e029ad1156a
DTSTAMP:20260415T201333
DTSTART:20140331T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20140331T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/368802
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:New insights regarding the Raman spectroscopy of carbon-based nano 
 structures – Jean-Louis Sauvagol\, CNRS Montpellier\, France
DESCRIPTION:Jean-Louis Sauvagol\, Laboratoire Charles Coulomb\, CNRS et Un
 viersi†é de Montpellier 2\, FranceNew insights regarding the Raman spec
 troscopy of carbon-based nanostructures: Individual Nanotubes and Graphen
 eFew years ago\, we demonstrated that combining high-resolution transmissi
 on electron spectroscopy (HRTEM)\, electron diffraction and resonant Raman
  spectroscopy experiments on the same suspended (free-standing) individual
  single-walled carbon nanotubes (SWNTs) was the ultimate method to determi
 ne unambiguously the intrinsic features of phonons in SWNTs. This method w
 as recently applied on double-walled carbon nanotubes (DWNTs). DWNTs provi
 de a unique model for studying the role of the inter-tube coupling on the 
 phonons and optical properties of these nanostructures. I will report rece
 nt results measured in index-identified DWNTs. From these data\, the role 
 of the inter-tube distance on the features of phonons in DWNTs is identifi
 ed.It is known that the ultimate surface exposure provided by graphene mon
 olayer makes it the ideal sensor platform but also exposes its intrinsic p
 roperties to any environmental perturbations. I will demonstrate that the 
 charge carrier density of graphene exfoliated on a SiO2/Si substrate can b
 e finely and reversibly tuned between electron and hole doping with visibl
 e photons. This photo-induced doping happens under moderate laser power co
 nditions but is significantly affected by the substrate cleaning method. I
 n particular\, it requires hydrophilic substrates and totally vanishes for
  suspended graphene. These findings also suggest that Raman spectroscopy i
 s not always as non-invasive as generally assumed. Site web du groupe du 
  Prof. SauvagolCette conférence est présentée par le RQMP Versant Nord
  du Département de physique de l'Université de Montréal et le Départe
 ment de génie physique de Polytechnique Montréal.
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Montreal
X-LIC-LOCATION:America/Montreal
END:VTIMEZONE
END:VCALENDAR