WP6 : metrology of the metal/semiconductor ratio (MSR) Goal : developing a routine method to measure...
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WP6 : metrology of the metal/semiconductor ratio (MSR) : developing a routine method to measure the MSR cal spectroscopy technique(s) : * optical absorption (OA) * photoluminescence excitation (PLE) * resonant Raman spectroscopy (RR)
WP6 : metrology of the metal/semiconductor ratio (MSR) Goal : developing a routine method to measure the MSR Optical spectroscopy technique(s) : * optical
Electronic and optical properties(from Jorio et al)Kataura
plot
Electronic and optical properties(from Jorio et al)Kataura
plot!! The Eii vary depending on the environment
:individual/bundles, gas/liquid matrix, surfactant/substrate !!
Arc electric sample (1.2 nm
Arc electric sample (1.2 nm
M.J. OConnell et al., Science 297 (2002) 593UnbundlingSynthesis
of individual SWNTsJ. Kong et al., Nature 395 (1998) 878Optical
properties : emission (PL, fluorescence)Only observed on individual
semiconducting SWNT(no contacts with metallic)Excitation (661
nm)Emission(850 nm)
Bachilo et al, Science, 298, 2361 (2002)Optical properties :
NIR fluorescenceIdentification of a (n,m) nanotubefrom the couple
(Eii,E11)HiPCO sample (0.7 nm
Resonant Raman scatteringArc electric sample(1.2 nm
WP6 : metrology of the metal/semiconductor ratio (MSR)Goal :
developing a routine method to measure the MSROptical spectroscopy
technique(s) : absorption, PLE, RR
Method 1 : optical absorption in surfactant-based
dispersionnarrowing of the spectroscopic signaturesavoids
texture-induced effectsone has to know the OA
coefficientsAlternative : measurements on transparent quartz
substrates
Method 2 : RR spectroscopy (any substrate)very high sensitivity
and selectivityone has to mesure the Eii and select a couple of
Elaserone has to measure the RR cross sections (coupling with
method 1)Alternatives : relative (semi-quantitative)
measurements
Couplings with PLE and TEM will help!
Liaisons fortes : combinaison linaire dorbitales atomiques.La
fonction donde de l dans le cristal est calcule comme la
combinaison linaire des fonctions donde de chaque atome soumisau
potentiel dintercation du cristal.Liaisons fortes : combinaison
linaire dorbitales atomiques.La fonction donde de l dans le cristal
est calcule comme la combinaison linaire des fonctions donde de
chaque atome soumisau potentiel dintercation du cristal.
