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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Compositional inhomogeneity of Pd-Ag nanoparticles probed by hydrogen
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Compositional inhomogeneity of Pd-Ag nanoparticles probed by hydrogen

机译：氢探测Pd-Ag纳米粒子的组成不均匀性

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摘要

Nanoparticles of Pd_(77)Ag_(23) and Pd_(60)Ag_(40) of sizes 6-7 nm were prepared by a wet reduction method. The surface compositions obtained by electron spectroscopy for chemical analysis indicated that the particles were not homogeneous. The surface was Pd-rich, and oxidation of Pd on the surface was observed for the as-prepared samples. When the samples were heated in vacuum at higher temperatures, the fraction of Ag on the surface was increased due to its lower surface energy than palladium. Hydrogen was used as a probe atom to examine the variation of surface composition of the nanoparticles. The pressure-composition isotherms were different for different heatings, and were different from those of coarse-grained materials, indicating that the composition across the diameter was not homogeneous. It is proposed that this inhomogeneity is an intrinsic property for binary nanocrystalline alloys prepared by wet reduction.
机译：通过湿还原法制备尺寸为6-7nm的Pd_（77）Ag_（23）和Pd_（60）Ag_（40）的纳米颗粒。通过电子光谱学获得的用于化学分析的表面组成表明颗粒不均匀。该表面富含Pd，并且对于所制备的样品观察到Pd在表面上的氧化。当样品在较高的真空度下加热时，由于其表面能比钯低，因此表面上的银含量增加。氢被用作探针原子以检查纳米颗粒的表面组成的变化。对于不同的加热，压力-组成等温线是不同的，并且与粗颗粒材料的等温线不同，表明整个直径上的组成是不均匀的。提出这种不均匀性是通过湿还原制备的二元纳米晶体合金的固有性质。

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