After the reaction (Figure ), we observed the appearance of an emission peak at ~1155-1159 nm, the exact position of which was dependent on the degree of functionalization (Figure ). This peak is caused by the formation of aryl defects on the nanotube surface. The intensity of this peak could be tuned by controlling the amount of diazonium or hydrogen peroxide added to the solution (Figure ). Furthermore, the appearance of the E11 -peak resulted in only minimal disruption to the E11 peak (Figure ), in contrast with other functionalization strategies which result in significant or total loss of E11 emission. This is likely in part due to the protection afforded by the DNA wrapping, with only certain areas of the nanotube surface exposed for reaction with aryl radicals, preventing over-functionalization. Additionally, adsorption of diazonium compounds may result in electron transfer from the SWCNTs to diazonium compounds, which would result in loss of emission due to the non-emissive nature of oxidized SWCNTs. As an electron donor, hydrogen peroxide may reverse this oxidation, restoring SWCNT fluorescence.