We investigated whether the reaction can be performed on SWCNTs dispersed with other wrapping agents. SWCNTs with five different wrappings were prepared and functionalized using NO2PhN2-BF4. These included three ssDNA sequences ((GT)15, (AT)15 and (TAT)4) and a PEG-based surfactant (1,2-dimyristoyl-rac-glycero-3-methoxypoly(ethylene glycol)-2000 (DMG-PEG2000)). As shown in Figure , all four CCNTs exhibited E11 -emission peaks at ~1160 nm, demonstrating the versatility of this method for functionalizing pre-wrapped nanotubes. As expected, the exact position of the E11 -peak depended upon the choice of wrapping agent. The concentration of NO2PhN2-BF4 needed to achieve this E11 -intensity also varied with the choice of wrapping agent, as listed in Table . This is likely due to factors such as variations in the degree of nanotube coverage by the polymer, and the effect of the polymer wrapping on local pH. DMG-PEG2000 required over a ten-fold greater concentration of NO2PhN2-BF4 as compared to the DNA-wrapped nanotubes, likely due to the high degree of coverage afforded by the surfactant-based wrapping. The E11 -peak wavelengths are listed in Table . Finally, peroxide-mediated functionalization of SWCNTs was also performed using surfactant-dispersed SWCNTs. Functionalization was attempted using sodium dodecyl sulfate (SDS) and sodium deoxycholate (DOC)-dispersed SWCNTs. As shown in Figure , the SDS-SG65i SWCNTs treated with NO2PhN2-BF4 and hydrogen peroxide showed significant functionalization after 30 min, in contrast to those treated with NO2PhN2-BF4 alone. The DOC-SG65i SWCNTs, however, showed no functionalization of (6,5) SWCNTs in either the presence or absence of hydrogen peroxide, likely due to a higher degree of SWCNT coverage as has been previously observed. Furthermore, functionalization of SDS-SG65i appeared to initially result in a large 1060 nm emission peak (Figure ), corresponding to the E11 -emission peak of (6,4)-CCNTs. By 16 h of functionalization the (6,5)-CCNT E11 -emission peak was greater than the (6,4)-CCNT E11 -emission. It has been previously observed that larger diameter SWCNTs have stronger interactions with SDS at high concentrations. These stronger interactions likely result in slower functionalization of (6,5) SWCNTs than the smaller diameter (6,4) SWCNTs when wrapped with SDS.