LACM-DTI, LRC-CEA 0534/EA 4302, UFR Sciences Exactes et Naturelles, BP 1039, F-51687 Reims, Cedex 2, France.
Ultrason Sonochem. 2010 Apr;17(4):690-6. doi: 10.1016/j.ultsonch.2009.12.009. Epub 2009 Dec 11.
Cu-Ag core-shell nanopowders have been prepared by ultrasound-assisted electrochemistry followed by a displacement reaction. The composition of the particles has been determined by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). The XRD patterns versus time displacement show that higher are the silver peaks intensities, weaker are the copper ones. That exhibits the progressive recovering of copper by silver. EDX results and quartz crystal microbalance results indicate that various reaction mechanisms are implied in this process. Transmission electron microscopy (TEM) points out variable nanometric diameter grain and some small agglomerates. Elemental mapping obtained by electron energy-loss spectroscopy (EELS) underlines the core-shell structure.
采用超声辅助电化学法和置换反应制备了 Cu-Ag 核壳纳米粉末。通过 X 射线衍射（XRD）和能谱（EDX）确定了颗粒的组成。XRD 图谱随时间位移显示，银峰强度越高，铜峰越弱。这表明银逐渐取代了铜。EDX 结果和石英晶体微天平结果表明，该过程涉及多种反应机制。透射电子显微镜（TEM）指出了不同纳米直径的晶粒和一些小团聚体。电子能量损失谱（EELS）获得的元素映射强调了核壳结构。
