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首页> 外文期刊>Applied Surface Science >Epitaxial growth of Ag-Cu bimetallic nanoparticles via thermal evaporation deposition
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Epitaxial growth of Ag-Cu bimetallic nanoparticles via thermal evaporation deposition

机译：通过热蒸发沉积外延生长Ag-Cu双金属纳米粒子

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摘要

The epitaxial growth of silver on copper benefits carriers' transport across interfaces and is thus important for opto-electronic applications and catalysis. Cu-Ag bimetallic nanoparticles have long been fabricated using chemical methods. The epitaxial growth of silver on copper has been rarely reported. In this study, we demonstrate the fabrication of Cu-Ag bimetallic nanoparticle with a configuration of silver epitaxial growth on copper via thermal evaporation deposition in vacuum, in which not only the oxidation of copper is reduced but also contamination is avoided. Meanwhile, a core-shell-like bimetallic nanoparticle with a copper core and a silver shell is also fabricated. The configurations of the two kinds of Cu-Ag bimetallic nanoparticles were explored by analyzing the changes of the X-ray photoelectron spectra, high resolution transmission electron microscopy images, diffraction rings, and glancing angle X-ray diffraction patterns with the increasing amount of silver and copper. A model of lattice matching between silver on copper was also established for the epitaxial Cu-Ag bimetallic nanoparticle. The layered epitaxial bimetallic nanoparticle show strong anti-oxidation effect and obvious localized surface plasmon resonance damping of Ag nanoparticles, suitable for applications requiring anti-oxidation and low absorbance.
机译：银在铜上的外延生长有利于载流子跨界面传输，因此对于光电应用和催化非常重要。长期以来，Cu-Ag双金属纳米颗粒是使用化学方法制造的。银在铜上外延生长的报道很少。在这项研究中，我们证明了通过在真空中通过热蒸发沉积在铜上外延生长具有银外延生长构型的Cu-Ag双金属纳米粒子，不仅减少了铜的氧化，而且避免了污染。同时，还制备了具有铜核和银壳的核-壳状双金属纳米颗粒。通过分析X射线光电子能谱，高分辨率透射电子显微镜图像，衍射环和掠射角X射线衍射图随银含量的变化而探索了两种Cu-Ag双金属纳米颗粒的构型。和铜。还为外延Cu-Ag双金属纳米粒子建立了银在铜上的晶格匹配模型。层状外延双金属纳米粒子表现出较强的抗氧化作用，并且对银纳米粒子具有明显的局部表面等离振子共振阻尼，适用于需要抗氧化和低吸收的应用。

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