Synchrotron x-ray diffraction measurements of strain in metallic nanoparticles with oxide shells
Synchrotron x-ray diffraction measurements of strain in metallic nanoparticles with oxide shells
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具有氧化物壳的金属纳米粒子应变的同步加速器 X 射线衍射测量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Toney
中科院分区：
文献类型：
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作者：
B. Ingham;S. Hendy;D. Fong;P. Fuoss;J. Eastman;A. Lassesson;K. Tee;P. Convers;S. A. Brown;M. Ryan;M. Toney
我们描述了同步辐射X射线衍射测量的应变在Cu和Pd金属纳米粒子（1.7-40 nm直径）都与空气形成的氧化物壳和氧化物还原后，通过在含氢的气氛中处理。氧化物去除从X射线衍射（对于Cu）和X射线吸收光谱（对于Pd）是明显的。一个简单的模型，使用体弹性性能被应用到每个系统。在Pd的情况下，模型预测与实验吻合得很好。对于Cu，观察到的应变比预测的小得多。这种差异归因于（a）Cu颗粒内存在多个晶粒和（B）氧化物与金属芯的不相干性。
We describe synchrotron x-ray diffraction measurements of strain in Cu and Pd metal nanoparticles (1.7–40 nm diameter) both with an air-formed oxide shell and after reduction of the oxide by treatment in a hydrogen-containing atmosphere. Oxide removal is evident from x-ray diffraction (for Cu) and x-ray absorption spectroscopy (for Pd). A simple model that uses bulk elastic properties is applied to each system. In the Pd case the model predictions agree well with the experiment. For Cu the observed strains are much smaller than predicted. This discrepancy is attributed to (a) the presence of multiple grains within the Cu particles and (b) the incoherency of the oxide with the metal core.