Single MoS2 Nanotube Experimental Optical Extinction Cross Section
Résumé
The experimentally retrieved value of the optical extinction cross section per unit length, σNTL,ext, of individual MoS2 multi-wall nanotubes is here reported over the 440 -940 nm wavelength range, for light polarization both parallel and perpendicular to the nanotube longitudinal axis. The impact of nanotube diameter and environment on σNTL,ext is addressed for individual nanotubes with diameters of 120 and 220 nm, in suspended, sapphire-supported, and PMMAsupported configurations. Measuring on individual nanotubes is of the utmost importance given the wide nanotube size dispersion intrinsic to the synthesis process. The findings are interpreted in conjunction with finite element method simulations, informed by morphological input parameters from electron microscopies, offering insight into the respective contributions of absorption and scattering cross sections per unit length to the overall σNTL,ext. These quantitative results are of relevance in view of optoelectronics applications involving MoS2 nanotubes, while providing benchmark values for theoretical investigations on their nanooptical response.
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