Tungsten sub-oxide (W 17 O 47 ) nanoparticles were produced for the first time, via pulsed laser ablation of a pure tungsten target in distilled water. The beam of a Q-switched Nd:YAG laser of 1064 nm wavelength with 0.6, 0.8, 1.2 and 1.4 J/cm 2 fluences was employed to irradiate the target. Produced nanoparticles were characterized using field emission scanning electron microscopy coupled with energy dispersive spectrometry, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), UV–Vis absorption spectroscopy and room temperature Photoluminescence (PL). XRD patterns revealed that all samples possess the monoclinic structure corresponding to $${\mathrm{W}}_{17}{\mathrm{O}}_{47}$$ W 17 O 47 phase. With increasing the laser fluence, the average size of the nanoparticles increased and subsequently, their band gap energy decreased. The PL spectra of the samples show the presence of oxygen vacancies or defects.

中文翻译：

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水中低氧化钨 (W17O47) 纳米粒子的激光烧蚀辅助合成：激光能量密度的影响

钨低价氧化物 (W 17 O 47 ) 纳米颗粒是首次通过脉冲激光烧蚀蒸馏水中的纯钨靶产生。使用具有 0.6、0.8、1.2 和 1.4 J/cm 2 能量密度的 1064 nm 波长的 Q 开关 Nd:YAG 激光束来照射目标。使用场发射扫描电子显微镜结合能量色散光谱、透射电子显微镜、傅里叶变换红外光谱、X 射线衍射 (XRD)、紫外-可见吸收光谱和室温光致发光 (PL) 对产生的纳米粒子进行表征。XRD图谱显示所有样品均具有对应于$${\mathrm{W}}_{17}{\mathrm{O}}_{47}$$ W 17 O 47 相的单斜结构。随着激光能量密度的增加，纳米颗粒的平均尺寸增加，随后，它们的带隙能量降低。样品的 PL 光谱显示存在氧空位或缺陷。