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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Mechanical Properties of Ag Nanoparticle Thin Films Synthesized by Supersonic Cluster Beam Deposition
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Mechanical Properties of Ag Nanoparticle Thin Films Synthesized by Supersonic Cluster Beam Deposition

机译：超音速簇束沉积法合成Ag纳米颗粒薄膜的力学性能

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摘要

The morphological and mechanical properties of nanoparticles-based ultrathin Ag films, synthesized by supersonic cluster beam deposition over a sapphire substrate, are unveiled exploiting ultrafast optoacoustic, atomic,force microscopy, Xray photoelectron spectroscopies, and X-ray diffraction techniques. The films, with thicknesses in the 10-50 nm range, have a porous structure composed of metallic Ag nanoparticles with a crystalline structure and average diameter of 6 nm. The films acoustic modes are in the hypersonic frequency range, the thinner films frequencies exceeding 100 GHz. The acoustic spectra are well accounted for modeling the nanoparticles film as an effective continuous medium. The modes quality factors show the existence of acoustically quasi-dark and bright states. The film effective density and effective elastic stiffness constants are respectively 0.8 and 0.5 that of bulk Ag. The present results are relevant in view of applications for optoacoustic transducers in the hypersonic frequency range, for optical coatings technology and for the production of mechanically stable bactericidal coatings.
机译：利用超快光声，原子，力显微镜，X射线光电子能谱和X射线衍射技术，揭示了通过超声簇束沉积在蓝宝石衬底上合成的基于纳米粒子的超薄银膜的形态和力学性能。膜的厚度在10-50nm范围内，具有由具有结晶结构且平均直径为6nm的金属Ag纳米颗粒组成的多孔结构。薄膜的声模在高超声频率范围内，较薄的薄膜频率超过100 GHz。声谱被很好地解释为将纳米颗粒膜建模为有效的连续介质。模态品质因数表明存在声学准暗态和亮态。膜的有效密度和有效弹性刚度常数分别是块状Ag的0.8和0.5。考虑到在超音速频率范围内的光声换能器的应用，光学涂层技术以及机械稳定的杀菌涂层的生产，本结果是有意义的。

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