単層カーボンナノチューブの多環芳香族炭化水素に対するサイズ選択的蛍光応答のためのモジュラー戦略としての後官能基化修飾

Single-walled carbon nanotubes (SWCNTs) with tailored functionalization serve as optically responsive nanoparticles, but when encapsulated by chirality-selective polymers, they often remain inert to analytes. To expand their utility, we developed a post-functionalization modification (PFM) strategy introducing oxygen defects into chirality-pure (6,5) and (7,5) SWCNTs suspended by PFO-BPy6,6' and PFO-FH, respectively. UV exposure in the presence of sodium hypochlorite (NaClO) partially displaces the polymer corona, confirmed by low-temperature fluorescence, Raman spectroscopy, dynamic light scattering, and transmission electron microscopy. To probe corona displacement, riboflavin (RB) was employed as a fluorescent reporter for the exposed SWCNT surface. Minimal RB quenching was observed with (6,5) and (7,5) SWCNTs treated with low NaClO concentration (0.01%), indicating high coverage, while dispersions treated with higher NaClO concentration (0.055%) showed strong RB quenching, reflecting reduced coverage. This trend establishes NaClO concentration as a handle to tune corona coverage. We further show that surface coverage modulates size-selective adsorption of polyaromatic hydrocarbons (PAHs). At intermediate NaClO treatment (0.02%), PFM-SWCNTs responded selectively to naphthalene (2-ring PAH), while higher treatment (0.055%) enabled response to naphthalene, fluorene, and pyrene (2, 3, and 4-ring PAH). These findings demonstrate that PFM enables controllable surface coverage and size-selective PAH interactions, broadening SWCNTs utility as optical nanoprobes.