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arXiv 2001.11126cond-mat.mes-hallphysics.optics
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层状Mo $S_2$光学性质的应变诱导调谐

Strain-induced tuning of optical properties of layered Mo$S_2$

Shubham Bhagat, Shivani Sharma, Jasvir Singh, Sandeep Sharma

摘要:

Mo $S_2$中光学参数和应变之间的敏感相关性导致了完全不同的光学性质调谐方法。通常,采用外部应变源来监测材料的光学和振动特性。精确控制应变及其对材料性能的影响始终是一项挑战。在这里,我们报告的存在下,在钼$S_2$结晶粉末和纳米片通过球磨和探头超声处理的过程中获得的压缩应变。X射线衍射图中的衍射峰向较高的2 $θ$值移动,这意味着压缩应变随处理时间增加。吸收光谱、光致发光和拉曼模式相对于未处理的大块样品发生蓝移。所观察到的蓝移归因于样品中压缩应变的存在。而在Mo $S_2$的薄纳米片中,很可能量子限制和应变都导致观察到的蓝移。这些结果表明,通过优化处理条件和/或时间,可以实现期望量的应变,从而实现材料的光学性质的可调偏移。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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