Figure 26.

Different types of light-responsive DNA–polymer dynamic nanostructures. (A) Schematic of UV-promoted degradation of hyperbranched polymer (HBP)–OH. O-Nitrobenzyl moieties were introduced to the HBP side chains and would be cleaved under UV irradiation.¹²⁰ Adapted with permission from ref (120). Copyright 2018 John Wiley and Sons. (B) Light-responsive shape-shifting of photocleavable Cy3Cy3-DNA nanofibers. The morphology of DNA nanostructures would be transformed from nanofibers to spherical nanoparticle due to the cleavage of Cy3Cy3 units from the structure under UV irradiation at 365 nm.²⁰⁸ Adapted with permission from ref (208). Copyright 2018 American Chemical Society.