MoS₂ nanosheets are synthesized by incorporating a manual grinding of the bulk powder prior to the sonication in the standard liquid phase exfoliation process. The light emission properties of MoS₂ is thereby found to be significantly improved. Transmission electron microscopy shows continuous ultrathin MoS₂ nanosheets of larger dimensions in the grinding-assisted synthesis. Raman spectroscopy measurements show that MoS₂ is exfoliated down to 3–4 layers by an inclusion of the grinding. UV–visible and photoluminescence spectroscopy were used to analyze the changes in the optical properties. Grinding helps to reduce the influence of the degradation of the NMP solvent on the emission characteristics of the exfoliated material. The strong visible photoluminescence emission due to sonochemical degradation of NMP is suppressed and the excitonic emission due to the A and B excitons relative to NMP emission is significantly enhanced. The results suggest an easy and reliable approach to enhance the optical emission of two-dimensional MoS₂ appreciably.

MoS ₂纳米片是通过在标准液相剥落工艺中进行超声处理之前，将块状粉末进行手动研磨而合成的。由此发现，MoS _2的发光特性显着改善。透射电子显微镜显示在研磨辅助合成中较大尺寸的连续超薄MoS ₂纳米片。拉曼光谱测量表明，MoS ₂通过磨削将其剥落至3-4层。紫外可见光和光致发光光谱用于分析光学性质的变化。研磨有助于减少NMP溶剂的降解对剥离材料的发射特性的影响。抑制了由于NMP的声化学降解而产生的强烈的可见光致发光发射，并且相对于NMP发射而言，由于A和B激子引起的激子发射得到了显着增强。结果表明，一种简单而可靠的方法可以显着增强二维MoS ₂的光发射。