Semiconducting single-wall carbon nanotubes (SWCNTs) are a promising materials platform for near-infrared in-vivo imaging, optical sensing, and single-photon emission at telecommunication wavelengths. The functionalization of SWCNTs with luminescent defects can result in considerably enhanced photoluminescence (PL) properties because of environment friendly trapping of extremely cellular excitons and red-shifted emission from these lure states. Among the many most studied luminescent defect varieties are oxygen and aryl defects which have largely comparable optical properties. Thus far, no direct comparability between SWCNTs functionalized with oxygen and aryl defects underneath equivalent circumstances has been carried out. Right here, we make use of a mixture of spectroscopic methods to quantify the variety of defects, their distribution alongside the nanotubes and thus their exciton trapping efficiencies. The completely different slopes of Raman D/G+ ratios versus calculated defect densities from PL quantum yield measurements point out substantial dissimilarities between oxygen and aryl defects. Supported by statistical evaluation of single-nanotube PL spectra at cryogenic temperatures it reveals clustering of oxygen defects. The clustering of 2-3 oxygen defects, which act as a single exciton lure, happens no matter the functionalization methodology and thus permits the usage of easy equations to find out the density of oxygen defects and oxygen defect clusters in SWCNTs based mostly on normal Raman spectroscopy. The offered analytical method is a flexible and delicate software to review defect distribution and clustering in SWCNTs and could be utilized to any new functionalization methodology.
