Band gap opening of metallic single- walled carbon nanotubes via noncovalent symmetry breaking

• 成果类型: Article
• 署名作者: Mastrocinque, Francesco; Bullard, George; Alatis, James A.; Albro, Joseph A.; Nayak, Animesh; Williams, Nicholas X.; Kumbhar, Amar; Meikle, Hope; Widel, Zachary X. W.; Bai, Yusong; Harvey, Alexis K.; Atkin, Joanna M.; Waldeck, David H.; Franklin, Aaron D.; Therien, Michael J.; Rossky, Peter J.
• 署名单位: Duke University; Pennsylvania Commonwealth System of Higher Education (PCSHE); University of Pittsburgh; Duke University; University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina; University of North Carolina Chapel Hill
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13061
• DOI: 10.1073/pnas.2317078121
• 发表日期: 2024-03-19
• 关键词: polymers; graphene; SPECTRA

摘要

Covalent bonding interactions determine the energy-momentum (E-k) dispersion (band structure) of solid - state materials. Here, we show that noncovalent interactions can modulate the E-k dispersion near the Fermi level of a low- dimensional nanoscale conductor. We demonstrate that low energy band gaps may be opened in metallic carbon nanotubes through polymer wrapping of the nanotube surface at fixed helical periodicity. Electronic spectral, chiro- optic, potentiometric, electronic device, and work function data corroborate that the magnitude of band gap opening depends on the nature of the polymer electronic structure. Polymer dewrapping reverses the conducting - to- semiconducting phase transition, restoring the native metallic carbon nanotube electronic structure. These results address a long- standing challenge to develop carbon nanotube electronic structures that are not realized through disruption of pi conjugation, and establish a roadmap for designing and tuning specialized semiconductors that feature band gaps on the order of a few hundred meV.