Citation

Abdullahi, Yusuf Zuntu and Yoon, Tiem Leong and Mahadi, Mohd Halim and Hashim, Md. Roslan and Lim, Thong Leng (2017) Theoretical studies on mechanical and electronic properties of s-triazine sheet. Journal Philosophical Magazine, 97 (24). pp. 2077-2088. ISSN 1478-6435, eISSN: 1478-6443

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Abstract

Mechanical and electronic properties of s-triazine sheet are studied using first-principles calculations based on density functional theory. The in-plane stiffness and bulk modulus for s-triazine sheet are found to be less than that of heptazine. The reduction can be related to the nature of the covalent bonds connecting the adjacent sheets and the number of atoms per unit cell. The Poisson’s ratio of s-triazine sheet is half the value to that of graphene. Additionally, the calculated values of the two critical strains (elastic and yielding points) of s-triazine sheet are in the same order of magnitude to that for heptazine which was calculated using MD simulations in the literature. It is also demonstrated that s-triazine sheet can withstand larger tension in the plastic region. These results established a stable mechanical property for s-triazine sheet. We found a linear relationship of bandgap as a function of bi-axial tensile strain within the harmonic elastic region. The reduced steric repulsion of the lone pairs (px-, py-) causes the pz-like orbital to shift to high energy, and consequently an increase in the bandgap. We find no electronic properties modulation of the s-triazine sheet under electric field up to a peak value of 10 V/nm. Such noble properties may be useful in future nanomaterial applications.

Item Type:	Article
Uncontrolled Keywords:	s-triazine, density functional theory, mechanical properties, electronic properties
Subjects:	Q Science > QC Physics > QC170-197 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Divisions:	Faculty of Engineering and Technology (FET)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	21 Jul 2020 03:00
Last Modified:	21 Jul 2020 03:30
URII:	http://shdl.mmu.edu.my/id/eprint/6945

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