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 resulting from environment friendly trapping of extremely cellular excitons and red-shifted emission from these entice states. Among the many most studied luminescent defect varieties are oxygen and aryl defects which have largely comparable optical properties. Up to now, no direct comparability between SWCNTs functionalized with oxygen and aryl defects below similar circumstances has been carried out. Right here, we make use of a mix of spectroscopic strategies to quantify the variety of defects, their distribution alongside the nanotubes and thus their exciton trapping efficiencies. The totally 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 entice, happens regardless of the functionalization methodology and thus permits using easy equations to find out the density of oxygen defects and oxygen defect clusters in SWCNTs primarily based on normal Raman spectroscopy. The introduced analytical method is a flexible and delicate instrument to check defect distribution and clustering in SWCNTs and could be utilized to any new functionalization methodology.
