Silver-rich clusters in nanoporous gold
Silver-rich clusters in nanoporous gold
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DOI：
10.1080/21663831.2016.1276485
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发表时间：
2017-01-01
影响因子：
8.3
通讯作者：
Weissmueller, Joerg
中科院分区：
文献类型：
--
作者：
Krekeler, Tobias;Strasser, Anastasia V.;Weissmueller, Joerg
透射电子显微镜下的高分辨率元素图谱显示，脱合金制备的纳米多孔金（NPG）中残留的银聚集成纳米级团簇。动力学Monte Carlo模拟证实，这些区域是从未暴露于腐蚀的母合金的埋藏遗迹。脱合金态的NPG表面被至少一个近纯金的原子单层覆盖。当界面控制材料的功能时，如在催化和传感中，块体中银的优先位置是相关的。在空气中退火通过表面扩散使合金均匀化。[图形].影响声明通常在通过脱合金制成的纳米多孔金中发现的残留银位于原始母合金的残留物中，这些残留物已避免腐蚀。
High-resolution elemental mapping in a transmission electron microscope shows that the residual silver in dealloying-made nanoporous gold (NPG) is aggregated in nanoscale clusters. Kinetic Monte Carlo simulation confirms that these regions are buried relics of the master alloy that have never been exposed to corrosion. The surface of as-dealloyed NPG is covered by at least one atomic monolayer of nearly pure gold. The preferential location of silver in the bulk is relevant when interfaces control the material's function, as in catalysis and sensing. Annealing in air homogenizes the alloy by surface diffusion.[GRAPHICS].IMPACT STATEMENTThe residual silver which is typically found in nanoporous gold made by dealloying is localized in clusters that are relics of the original master alloy which have evaded corrosion.