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Abstract：
Silver nanoclusters are valuable for a variety of applications. A combination of direct current (DC) magnetron sputtering and inert gas condensation methods, employed within an ultra-high vacuum (UHV) system, was used to generate Ag nanoclusters with an average size of 4 nm. Various analytical techniques, including Scanning Probe Microscopy (SPM), X-ray Diffraction (XRD), Kelvin Probe Force Microscopy (KPFM), UV-visible absorption, and Photoluminescence, were employed to characterize the produced Ag nanoclusters. AFM topographic imaging revealed spherical nanoparticles with sizes ranging from 3 to 6 nm, corroborating data from a quadrupole mass filter (QMF). The XRD analysis verified the simple cubic structure of the Ag nanoclusters. The surface potential was assessed using KPFM, from which the work function was calculated with a reference highly ordered pyrolytic graphite (HOPG). The UV-visible absorption spectra displayed peaks within the 350-750 nm wavelength range, with a strong absorption feature at 475 nm. Additionally, lower excitation wavelengths resulted in a sharp peak emission at 370 nm, which became weaker and broader when higher excitation wavelengths were used.
摘要：
银纳米团簇对于各种应用是有价值的。直流（DC）磁控溅射和惰性气体冷凝方法的组合，在超高真空(UHV)系统中使用，用于产生平均尺寸为4nm的Ag纳米团簇。各种分析技术，包括扫描探针显微镜（SPM），X射线衍射(XRD)开尔文探针力显微镜（KPFM），UV-可见光吸收，和光致发光，用于表征产生的Ag纳米团簇。AFM地形成像显示球形纳米颗粒的尺寸范围为3至6nm，证实来自四极滤质器(QMF)的数据。XRD分析证实了Ag纳米团簇的简单立方结构。使用KPFM评估表面电势，用参考高度有序的热解石墨（HOPG）计算功函数。紫外可见吸收光谱显示在350-750nm波长范围内的峰，在475nm处具有强吸收特征。此外,较低的激发波长导致在370nm处出现尖锐的峰值发射，当使用更高的激发波长时，它变得更弱和更宽。
