Effect of nanosecond and femtosecond pulse laser on the formation of WS2 nanostructures and field emission characteristics
Effect of nanosecond and femtosecond pulse laser on the formation of WS2 nanostructures and field emission characteristics
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纳秒和飞秒脉冲激光对WS2纳米结构形成及场发射特性的影响
DOI：
10.1142/s0217984919400141
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发表时间：
2019
影响因子：
1.9
通讯作者：
M. More
中科院分区：
文献类型：
--
作者：
P. Koinkar;K. Sasaki;A. Furube;K. Murai;T. Moriga;M. Shinde;S. Rane;Somnath R. Bhopale;M. More
脉冲激光烧蚀是一种在液体环境下生成纳米结构的简单、直接的方法。本文采用纳秒（ns）和飞秒（fs）激光烧蚀，烧蚀时间为120 min，形成硫化钨纳米结构[公式：见文]。此外，还对制备的样品进行了场发射研究。利用透射电子显微镜（TEM）、x射线衍射（XRD）和紫外可见光谱等表征技术确认了表面形貌和结构细节。结果表明，激光脉冲制度对纳米结构的尺寸减小起着至关重要的作用。x射线光谱揭示了ns激光烧蚀形成的[公式：见文]纳米颗粒，而fs激光烧蚀形成的[公式：见文]纳米片。TEM图像表明，经过ns激光和fs激光烧蚀处理的样品，微片转变为尺寸约为15 ~ 200 nm的纳米片。同时，结果清楚地表明激光烧蚀纳米片的场发射特性得到了改善。增强的场发射特性归因于纳米片的形成和分离。纳米结构在光电器件中有很大的应用潜力。
The pulse laser ablation is a simple and direct method used for the generation of nanostructures in liquid environment. In this paper, formation of tungsten sulfide [Formula: see text] nanostructures has been carried out using nanosecond (ns) and femtosecond (fs) laser ablation with ablation time 120 min. In addition, the field emission studies were performed of the prepared sample. The characterization techniques such as the transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-visible spectroscopy have been used to confirm the surface morphology as well as structural details. It is observed that the laser pulse regime plays a vital role on the size reduction of [Formula: see text] nanostructure. The X-ray spectra reveal the formation of [Formula: see text] nanoparticles for ns laser ablation, while [Formula: see text] nanosheets for fs laser ablation. The TEM images indicate that the transformation of [Formula: see text] microsheet into nanosheet of the size about 15–200 nm for the sample treated with ns laser and fs laser ablation. Also, the results clearly shows the improvement in the field emission characteristics for laser ablated [Formula: see text] nanosheets. The enhanced field emission characteristics is attributed to the formation and separation of few layer [Formula: see text] nanosheets. The [Formula: see text] nanostructures may have great potential for the applications in optoelectronic devices.
影响因子：
1.9
作者：
Plechinger, G.;Mann, J.;Korn, T.
通讯作者：
Korn, T.