| Autor: |
Lin Z; Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Beltran LC; Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA 22908, USA., De Los Santos ZA; Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Li Y; South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China., Adel T; Quantum Metrology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Fagan JA; Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Hight Walker AR; Quantum Metrology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA., Egelman EH; Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA 22908, USA., Zheng M; Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. |
| Abstrakt: |
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. |
