论文标题
分层Mo $ s_2 $的应变诱导的光学特性调整
Strain-induced tuning of optical properties of layered Mo$S_2$
论文作者
论文摘要
光学参数与Mo $ $ $ S_2 $应变之间的敏感相关性导致一种完全不同的方法来调整光学特性。通常，采用外部应变来源来监测材料的光学和振动特性。对应变及其对材料特性的后果进行精确控制始终具有挑战性。在这里，我们报告了Mo $ S_2 $结晶粉和通过磨球和探针超声处理获得的压缩应变和纳米片。 X射线衍射模式中的衍射峰转移到更高的2 $θ$值，这意味着压缩应变随处理时间的增加。吸收光谱，光致发光和拉曼模式是蓝色的W.R.T批量未加工样品。观察到的蓝移归因于样品中的压缩应变。而在Mo $ $ $ $ $ $ $ $ $ $ $ S_2 $的薄纳米表中，量子限制和应变很可能会导致观察到的蓝移。这些结果表明，通过优化处理条件和/或时间，可以实现所需量的应变，从而可以实现材料光学特性的可调转移。
The sensitive correlation between optical parameters and strain in Mo$S_2$ results in a totally different approach to tune the optical properties. Usually, an external source of strain is employed to monitor the optical and vibrational properties of a material. It is always challenging to have a precise control over the strain and its consequences on material properties. Here, we report the presence of a compressive strain in Mo$S_2$ crystalline powder and nanosheets obtained via the process of ball-milling and probe sonication. The diffraction peaks in the X-ray diffraction pattern shift to higher 2$θ$ value implying a compressive strain that increases with the processing time. The absorption spectra, photoluminescence and Raman modes are blue-shifted w.r.t the bulk unprocessed sample. The observed blue-shift is attributed to the presence of compressive strain in the samples. Whereas in thin nano-sheets of Mo$S_2$, it is very likely that both quantum confinement as well as strain result in the observed blue-shift. These results indicate that by optimizing the processing conditions and/or time, a strain of desired amount and hence tunable shift in optical properties of material can be achieved.
