基于紧束缚方法,在考虑最近邻相互作用的情况下,研究了拉伸锯齿型边和扶手型边单层石墨的能带结构,得到了两种类型单层石墨片的π电子能带及带隙与拉力的解析关系式.通过数值计算能够发现:拉力不但使单层石墨产生带隙,而且带隙随着拉力的增大而变宽,并且锯齿型比扶手型的带隙更易变宽. Based on the tight binding method, taking into account the nearest neighbor interaction, the energy band structure of the jagged edges and the handrail edge single-layer graphite was studied. The π electron energy bands and the bands of the two types of monolayer graphite sheets The numerical analysis shows that tensile force not only makes the single-layer graphite produce band gap, but also increases the bandgap with the increase of tensile force, and the zigzag-type becomes wider than the handrail-type bandgap.