Quenching induced fracture behaviors of CVD-grown polycrystalline molybdenum disulfide films

摘要: The fracture behavior of two-dimensional polycrystalline molybdenum disulfide (MoS2) films is essential to device performance and has attracted tremendous attention in recent years. Here, we investigate the mixed intergranular transgranular behaviors CVD-grown MoS2 atomic layers using multiple techniques. underlying mechanism proposed be that micro-cracks initially nucleate at grain boundary junctions propagate along with boundaries, resulting behavior. On other hand, as-existed sulfur vacancies serve as crack nuclei energy preference directions through Mo–S bond breaking, Lattice shrinking induced compressive, rather than tensile strain residual fractured microflakes, which enlarges corresponding bandgap by ∼200 meV. Our work deepens understanding demonstrates a promising method engineer MoS2-like atomically-thin materials further tune their physical properties.