DNA-guided lattice remodeling of carbon nanotubes

Authors：Lin, Zhiwei^*; Beltran, Leticia C.; De los Santos, Zeus A.; Li, Yinong; Adel, Tehseen; Fagan, Jeffrey A.; Walker, Angela R. Hight; Egelman, Edward H.; Zheng, Ming^*

Source：Science, 2022, 377(6605): 535-+.

DOI：10.1126/science.abo4628

• PHYSICS
• OXYGEN

Covalent modification of carbon nanotubes is a promising strategy for engineering their electronic structures. However, keeping modification sites in registration with a nanotube lattice is challenging. We report a solution using DNA-directed, guanine (G)-specific cross-linking chemistry. Through DNA screening we identify a sequence, C(3)GC(7)GC(3), whose reaction with an (8,3) enantiomer yields minimum disorder-induced Raman mode intensities and photoluminescence Stokes shift, suggesting ordered defect array formation. Single-particle cryo-electron microscopy shows that the C(3)GC(7)GC(3) functionalized (8,3) has an ordered helical structure with a 6.5 angstroms periodicity. Reaction mechanism analysis suggests that the helical periodicity arises from an array of G-modified carbon-carbon bonds separated by a fixed distance along an armchair helical line. Our findings may be used to remodel nanotube lattices for novel electronic properties.