Two-Dimensional Superlattice: Modulation of Band Gaps in Graphene-Based Monolayer Carbon Superlattices
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- 作者：Xiaoguang Luo ; Li-Min Liu ; Zhenpeng Hu ; Wei-Hua Wang ; Wen-Xiong Song ; Feifei Li ; Shi-Jin Zhao ; Hui Liu ; Hui-Tian Wang ; Yongjun Tian
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2012
- 出版时间：November 15, 2012
- 年：2012
- 卷：3
- 期：22
- 页码：3373-3378
- 全文大小：406K
- 年卷期：v.3,no.22(November 15, 2012)
- ISSN：1948-7185
文摘
A novel carbon allotrope consisting of parallel zigzag and armchair chains alternatively each other (10 atoms/cell, named pza-C10) was discovered. The calculated band gap of pza-C10 is 0.31 (0.71) eV with PBE (HSE06), and thus the new member of carbon family is a semiconductor. The pza-C10 sheet not only is thermodynamically more stable than the other known semiconducting carbon sheets, but also it can perfectly graft with graphene. The unprecedented properties of pza-C10 provide a new approach of modulating intrinsic band gap through forming graphene-based monolayer carbon superlattices (GSLs). The band gaps of GSLs with zigzag type of interface oscillate between semiconducting and semimetallic (mostly at the Dirac point) states as the number of zigzag chains increases, showing quantum size effect. The 2D superlattice achieved in GSLs opens a new strategy to design the crystal structures and modulate the electronic properties of 2D materials, nanoribbons, and nanotubes.