Nitrogen Doping Enables Covalent-Like π–π Bonding between Graphenes
Abstract
In neighboring layers of bilayer (and few-layer) graphenes, both AA and AB stacking motifs are known to be separated at a distance corresponding to van der Waals (vdW) interactions. In this Letter, we present for the first time a new aspect of graphene chemistry in terms of a special chemical bonding between the giant graphene "molecules". Through rigorous theoretical calculations, we demonstrate that the N-doped graphenes (NGPs) with various doping levels can form an unusual two-dimensional (2D) pi-pi bonding in bilayer NGPs bringing the neighboring NGPs to significantly reduced interlayer separations. The interlayer binding energies can be enhanced by up to 50% compared to the pristine graphene bilayers that are characterized by only vdW interactions. Such an unusual chemical bonding arises from the pi-pi overlap across the vdW gap while the individual layers maintain their in-plane pi-conjugation and are accordingly planar. Moreover, the existence of the resulting interlayer covalent-like bonding is corroborated by electronic structure calculations and crystal orbital overlap population (COOP) analyses. In NGP-based graphite with the optimal doping level, the NGP layers are uniformly stacked and the 3D bulk exhibits metallic characteristics both in the in-plane and along the stacking directions.
- Authors:
-
- Sichuan Univ., Chengdu (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Georgetown Univ., Washington, DC (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation of China; National Science Foundation (NSF)
- OSTI Identifier:
- 1261464
- Grant/Contract Number:
- AC05-00OR22725; 21443012; CHE-1006702; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 8; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; graphene; nitrogen doping; interlayer separation; pi-pi bonding; pancake bonding; van der Waals; CHEMICAL-VAPOR-DEPOSITION; N-DOPED GRAPHENE; BILAYER GRAPHENE; ELECTRONIC-STRUCTURE; MONOLAYER GRAPHENE; BORON; GRAPHITE; CRYSTAL; PANCAKE; DIMERS
Citation Formats
Tian, Yong-Hui, Huang, Jingsong, Sheng, Xiaolan, Sumpter, Bobby G., Yoon, Mina, and Kertesz, Miklos. Nitrogen Doping Enables Covalent-Like π–π Bonding between Graphenes. United States: N. p., 2015.
Web. doi:10.1021/acs.nanolett.5b01940.
Tian, Yong-Hui, Huang, Jingsong, Sheng, Xiaolan, Sumpter, Bobby G., Yoon, Mina, & Kertesz, Miklos. Nitrogen Doping Enables Covalent-Like π–π Bonding between Graphenes. United States. https://doi.org/10.1021/acs.nanolett.5b01940
Tian, Yong-Hui, Huang, Jingsong, Sheng, Xiaolan, Sumpter, Bobby G., Yoon, Mina, and Kertesz, Miklos. Tue .
"Nitrogen Doping Enables Covalent-Like π–π Bonding between Graphenes". United States. https://doi.org/10.1021/acs.nanolett.5b01940. https://www.osti.gov/servlets/purl/1261464.
@article{osti_1261464,
title = {Nitrogen Doping Enables Covalent-Like π–π Bonding between Graphenes},
author = {Tian, Yong-Hui and Huang, Jingsong and Sheng, Xiaolan and Sumpter, Bobby G. and Yoon, Mina and Kertesz, Miklos},
abstractNote = {In neighboring layers of bilayer (and few-layer) graphenes, both AA and AB stacking motifs are known to be separated at a distance corresponding to van der Waals (vdW) interactions. In this Letter, we present for the first time a new aspect of graphene chemistry in terms of a special chemical bonding between the giant graphene "molecules". Through rigorous theoretical calculations, we demonstrate that the N-doped graphenes (NGPs) with various doping levels can form an unusual two-dimensional (2D) pi-pi bonding in bilayer NGPs bringing the neighboring NGPs to significantly reduced interlayer separations. The interlayer binding energies can be enhanced by up to 50% compared to the pristine graphene bilayers that are characterized by only vdW interactions. Such an unusual chemical bonding arises from the pi-pi overlap across the vdW gap while the individual layers maintain their in-plane pi-conjugation and are accordingly planar. Moreover, the existence of the resulting interlayer covalent-like bonding is corroborated by electronic structure calculations and crystal orbital overlap population (COOP) analyses. In NGP-based graphite with the optimal doping level, the NGP layers are uniformly stacked and the 3D bulk exhibits metallic characteristics both in the in-plane and along the stacking directions.},
doi = {10.1021/acs.nanolett.5b01940},
journal = {Nano Letters},
number = 8,
volume = 15,
place = {United States},
year = {Tue Jul 07 00:00:00 EDT 2015},
month = {Tue Jul 07 00:00:00 EDT 2015}
}
Web of Science
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