Abstract
We studied the dispersion-process effects on the photoluminescence (PL) properties of single-walled carbon nanotubes (SWNTs) dispersed using poly[9,9-dioctylfluorenyl-2,7-diyl] (PFO) (PFO-SWNTs). The difference of the synthesis method (CoMoCAT, HiPco, and alcohol chemical vapor deposition) is insignificant for the PL quantum yields (QYs) of PFO-SWNTs. SWNTs processed using a moderate bath-type sonicator showed the maximum PL QY (∼2%) and the QY decreased drastically due to ultrasonic dispersion using a vigorous tip-type sonicator. The very low density of exciton quenching sites (<2 μm–1) introduced by the vigorous sonication was deduced based on the exciton diffusion model, indicating that the nanotube length itself almost limits the PL QYs in PFO-SWNTs.
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