MoS₂ nanoparticles (NPs) were prepared by nanosecond (ns) laser ablation in ethylene glycol using a Q-switched neodymium:ytterbium aluminum garnet laser at 1064 and 532 nm laser wavelengths. The influence of laser wavelengths in ns laser production of MoS₂ NPs is not yet fully understood. The shape, structure, crystalline phase, stability, and optical and photoluminescence (PL) properties of NPs were studied using TEM, dynamic light scattering, scanning electron microscopy with energy-dispersive x-ray, x-ray diffraction (XRD), ultraviolet–visible (UV–Vis), PL, Fourier transform infrared, and Raman spectroscopy. The UV–Vis absorption spectroscopy showed that the optimum laser wavelength for preparing MoS₂ NPs is 1064 nm. Also, the absorption peak intensity of MoS₂ NPs prepared at 1064 nm was 3.95 times higher than that at a 532 nm wavelength. In the case of ablation with 1064 nm, the most of NPs had spherical shapes and well dispersed compared with 532 nm. While the samples had the same crystalline structure for both wavelengths, as the laser wavelength increased, the mean particle size decreased from 22 to 13 nm. This is because of a photofragmentation phenomenon.

中文翻译：

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激光波长对乙二醇中激光辐照制备的二硫化钼纳米粒子光学和结构特性的影响

MoS ₂纳米颗粒(NPs) 是通过纳秒(ns) 激光烧蚀在乙二醇中使用Q 开关钕：镱铝石榴石激光器在1064 和532 nm 激光波长下制备的。激光波长对 MoS ₂ NPs 的ns 激光生产的影响尚未完全了解。使用 TEM、动态光散射、具有能量色散 x 射线的扫描电子显微镜、x 射线衍射 (XRD)、紫外-可见光 (UV-Vis)、PL、傅里叶变换红外和拉曼光谱。UV-Vis 吸收光谱表明制备 MoS ₂的最佳激光波长NPs 是 1064 nm。此外，在 1064 nm 处制备的 MoS ₂ NPs的吸收峰强度是在 532 nm 波长处的吸收峰强度的3.95 倍。在 1064 nm 烧蚀的情况下，与 532 nm 相比，大多数 NPs 呈球形且分散良好。虽然样品在两种波长下具有相同的晶体结构，但随着激光波长的增加，平均粒径从 22 nm 减小到 13 nm。这是因为光碎裂现象。