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首页> 外文期刊>Nanotechnology >Networks of ultra-fine Ag nanocrystals in a Teflon AF (R) matrix by vapour phase e-beam-assisted deposition
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Networks of ultra-fine Ag nanocrystals in a Teflon AF (R) matrix by vapour phase e-beam-assisted deposition

机译：气相电子束辅助沉积在特氟龙AF（R）基质中的超细Ag纳米晶体网络

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We have fabricated nanocomposite thin films comprising silver (Ag) nanoparticles dispersed in a Teflon AF (R) polymer matrix using electron-beam-assisted physical vapour deposition. Four different Ag nanoparticle volume fillings (20%, 35%, 70% and 75%) were achieved by varying the relative metal-polymer evaporation rates with the formation of highly crystalline Ag nanoparticles regardless of the filling ratio. The present fabrication technique allowed full control over dispersion uniformity of nanoparticles in the polymer network. At 20% and 35% metal volume fillings, the nanocomposite film morphology consists of a uniformly dispersed assembly of equiaxed isolated Ag nanoparticles. At higher metal volume fractions the nanocomposite structures displayed two different and unique Ag nanoparticle arrangements within the polymer matrix. In particular, at 70% metal filling, the formation of irregularly shaped clusters of individually assembled nanocrystals was observed. At a slightly higher volume filling (75%), larger irregularly shaped Ag nanocrystals that appeared to be the result of coalescence and grain growth were observed. Finally, a composite theory developed by Tandon and Weng was used to estimate various elastic properties of the nanocomposite films. At high metal filling, the reinforcing effect of the Ag nanoparticles was reflected as approximately a sixfold increase in the elastic modulus compared to the virgin polymer film. Possible applications of such ultra-fine metal nanoparticles networks are discussed.
机译：我们已经制备了纳米复合薄膜，其中包括使用电子束辅助物理气相沉积法将银（Ag）纳米颗粒分散在Teflon AF（R）聚合物基质中的方法。通过改变相对的金属-聚合物蒸发速率以及形成高度结晶的Ag纳米颗粒，无论填充率如何，均可实现四种不同的Ag纳米颗粒体积填充（20％，35％，70％和75％）。本制造技术允许完全控制聚合物网络中纳米颗粒的分散均匀性。在金属体积填充为20％和35％时，纳米复合膜的形态由等轴分离的Ag纳米颗粒的均匀分散组件组成。在较高的金属体积分数下，纳米复合结构在聚合物基质内显示出两种不同且独特的Ag纳米颗粒排列。特别地，在70％的金属填充下，观察到了单独组装的纳米晶体的不规则形状的簇的形成。在稍高的体积填充率（75％）下，观察到较大的不规则形状的Ag纳米晶体，似乎是聚结和晶粒生长的结果。最后，使用由Tandon和Weng开发的复合理论来估计纳米复合膜的各种弹性。在高金属填充率下，与原始聚合物薄膜相比，Ag纳米颗粒的增强作用反映为弹性模量增加了大约六倍。讨论了这种超细金属纳米颗粒网络的可能应用。

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