作者
Zhibin Gao, Xiao Dong, Nianbei Li, Jie Ren
发表日期
2018/1/25
期刊
Nano Letters
卷号
17
页码范围
772–777
出版商
American Chemical Society
简介
Silicon dioxide or silica, normally existing in various bulk crystalline and amorphous forms, was recently found to possess a two-dimensional structure. In this work, we use ab initio calculation and evolutionary algorithm to unveil three new two-dimensional (2D) silica structures whose thermal, dynamical, and mechanical stabilities are compared with many typical bulk silica. In particular, we find that all three of these 2D silica structures have large in-plane negative Poisson’s ratios with the largest one being double of penta graphene and three times of borophenes. The negative Poisson’s ratio originates from the interplay of lattice symmetry and SiO tetrahedron symmetry. Slab silica is also an insulating 2D material with the highest electronic band gap (>7 eV) among reported 2D structures. These exotic 2D silica with in-plane negative Poisson’s ratios and widest band gaps are expected to have great potential …
学术搜索中的文章
Z Gao, X Dong, N Li, J Ren - Nano letters, 2017