期刊
RESULTS IN PHYSICS
卷 16, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.rinp.2019.102826
关键词
Two-dimensional materials; Mechanical properties; Electronic structures; First-principles
资金
- National Natural Science Foundations of China [51171156, 51601153]
- Chongqing Science & Technology Commission [cstc2018jcyjax0582, cstc2017jcyjAX0195]
Two-dimensional materials play increasingly important roles in the fields of electronic and photoelectric applications. Four two-dimensional carbon and silicon monolayers with sp(2)-like hybrid chemical bonds have been predicted by the first-principles calculations based on density functional theory in the current work. One type of two-dimensional monolayer materials is composed of four- and eight-membered rings called octagonal-C and octagonal-Si, and another type of two-dimensional structures consists of regular triangles and twelve-membered rings named dodecagonal-C and dodecagonal-Si. The theoretical phonon dispersions show that all predicted structures are dynamically stable. The molecular dynamics simulation confirms that octagonal-C (-Si) and dodecagonal-C have good thermal stability to maintain their crystal structures lower than 1000 K, while dodecagonal-Si has slightly worse thermal stability. The analysis of electron density differences manifests that the covalent C-C and Si-Si bonds are dominant in these two-dimensional monolayer structures. All these four structures are mechanically stable, and the mechanical properties of octagonal-C are superior to the other three. The electronic band structures indicate that octagonal-C (-Si) and dodecagonal-Si are metallic. Interestingly, dodecagonal-C has a very small band gap of 0.09 eV, and it maybe have potential applications in infrared optical devices such as commercial optical filters and infrared detectors.
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