Metrological Investigation of the (6,5) Carbon Nanotube Absorption Cross Section

Abstract

Using single nanotube absorption microscopy, we measured the absorption cross-section of (6,5) carbon nanotubes at their second order optical transition. We obtained a value of 3.2 10 -17 cm 2 per carbon atom with a precision of 15% and an accuracy below 20%. This constitutes the first metrological investigation of the absorption cross-section of chirality-identified nanotubes. Correlative absorption-luminescence microscopies performed on long nanotubes reveal a direct manifestation of exciton diffusion in the nanotube.

Ultrafast Spectral Exciton Diffusion in Single-Wall Carbon Nanotubes Studied by Time-Resolved Hole Burning

“…[12][13][14][15] Moreover, the extraordinary large surface-to-volume ratio of s-SWNTs and the corresponding surface sensitivity of their properties can give rise to large variations of key photophysical properties reported in the literature. Examples are the magnitude of photoabsorption cross sections, [16][17][18][19] PL lifetimes [20][21][22][23] or homogeneous linewidths of exciton bands. 12,[24][25][26][27] This motivates the present study of photophysical properties of s-SWNTs in heterogeneous environments, which aims at exploring the effects of static spatial or dynamic potential modulations on exciton transport.…”

Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

“…As compared with other optical techniques, SMS has the key advantage of being sensitive to the optical extinction of the studied nano-object and to directly measure its absolute extinction cross-section. In the case of SWNTs, extinction being dominated by absorption, the value of the absorption crosssection of deposited CNTs was thus determined at a few specific laser wavelengths 15,20 .…”

Influences of Exciton Diffusion and Exciton-Exciton Annihilation on Photon Emission Statistics of Carbon Nanotubes

“…Evidence of EEA has been observed in the form of pump-dependent variations in PL decay dynamics [11][12][13] as well as saturation behaviors of PL [14,15] and transient absorption signals [20]. Many attempts have also been made to determine the exciton diffusion length, L D , in SWCNTs [8,[16][17][18][19], revealing values ranging from nanometers [9] to hundreds of nanometers [10,16,19]. The large discrepancies in these measurements have been attributed to effects of pump power [10], differences in fabrication methods (CoMoCAT or HiPco) [8,10], and the environment (surfactant-or DNA-wrapped or air-suspended) [8,10] of the SWCNTs.…”