Photoconductivity properties of aggregated single-walled carbon nanotubes have been studied by performing measurements on macroscopic ribbons, obtained by the aggregation of a large number of SWCNT bundles. Structural analysis performed by electron diffraction revealed that the nanotubes forming each bundle have the same chirality. The experimental results, regarding the region 1.2-3.6 eV and the pressure range 10(3)-10(-3) mbar, suggest that the photoexcitation of nanotubes, packed in bundles and organized in ribbons, generates electron-hole pairs within a band structure and that bond excitons are formed by Coulomb interactions between spatially confined charge carriers.
Photoconductivity of packed homotype bundles formed by aligned single-walled carbon nanotubes / Antonio, Serra; Daniela, Manno; E., Filippo; Antonio, Tepore; M. L., Terranova; Silvia, Orlanducci; Rossi, Marco. - In: NANO LETTERS. - ISSN 1530-6984. - STAMPA. - 8:3(2008), pp. 968-971. [10.1021/nl073052w]
Photoconductivity of packed homotype bundles formed by aligned single-walled carbon nanotubes
ROSSI, Marco
2008
Abstract
Photoconductivity properties of aggregated single-walled carbon nanotubes have been studied by performing measurements on macroscopic ribbons, obtained by the aggregation of a large number of SWCNT bundles. Structural analysis performed by electron diffraction revealed that the nanotubes forming each bundle have the same chirality. The experimental results, regarding the region 1.2-3.6 eV and the pressure range 10(3)-10(-3) mbar, suggest that the photoexcitation of nanotubes, packed in bundles and organized in ribbons, generates electron-hole pairs within a band structure and that bond excitons are formed by Coulomb interactions between spatially confined charge carriers.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
