TY - JOUR
T1 - The photoinduced charge transfer mechanism in aligned and unaligned carbon nanotubes
AU - Galimberti, Gianluca
AU - Pagliara, Stefania
AU - Ponzoni, Stefano
AU - Dal Conte, S
AU - Cilento, F
AU - Ferrini, Gabriele
AU - Hofmann, Stephan
AU - Arshad, Muhammad
AU - Cepek, C.
AU - Parmigiani, F.
PY - 2011
Y1 - 2011
N2 - Using time-resolved reflectivity measurements on unaligned and aligned bundled single-wall carbon nanotubes with a pump energy of 1.55 eV, quasi-resonant with the second Van Hoye singularity of semiconducting tubes, a positive sign of the transient reflectivity is detected in unaligned nanotubes. In contrast a negative sign is detected in aligned nanotubes. This discovery addresses a long-standing question showing that in unaligned nanotubes the stronger intertube interactions favor the formation of short-lived free charge carriers in semiconducting tubes. A detailed analysis of the transient reflectivity spectral response shows that the free carriers in the photo-excited state of semiconducting tubes move towards metallic tubes in about 400 fs.
AB - Using time-resolved reflectivity measurements on unaligned and aligned bundled single-wall carbon nanotubes with a pump energy of 1.55 eV, quasi-resonant with the second Van Hoye singularity of semiconducting tubes, a positive sign of the transient reflectivity is detected in unaligned nanotubes. In contrast a negative sign is detected in aligned nanotubes. This discovery addresses a long-standing question showing that in unaligned nanotubes the stronger intertube interactions favor the formation of short-lived free charge carriers in semiconducting tubes. A detailed analysis of the transient reflectivity spectral response shows that the free carriers in the photo-excited state of semiconducting tubes move towards metallic tubes in about 400 fs.
KW - Aligned nanotubes
KW - Free charge carriers
KW - Photoinduced charge transfer
KW - Transient reflectivity
KW - Aligned nanotubes
KW - Free charge carriers
KW - Photoinduced charge transfer
KW - Transient reflectivity
UR - https://publicatt.unicatt.it/handle/10807/10636
UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84857030440&origin=inward
UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84857030440&origin=inward
U2 - 10.1016/j.carbon.2011.07.042
DO - 10.1016/j.carbon.2011.07.042
M3 - Article
SN - 0008-6223
VL - 49
SP - 5246
EP - 5252
JO - Carbon
JF - Carbon
IS - Dicembre
ER -