Size and shape effects on the strength of platinum nanoparticles
Size and shape effects on the strength of platinum nanoparticles
复制标题
DOI：
10.1007/s10853-021-06435-7
复制
发表时间：
2021-08
影响因子：
4.5
通讯作者：
J. Zimmerman;A. Bisht;Y. Mishin;Eugen Rabkin
中科院分区：
文献类型：
--
作者：
J. Zimmerman;A. Bisht;Y. Mishin;Eugen Rabkin
几个先前的研究表明，无缺陷的面心立方金属（如Au，Ni和Pd）的多面纳米晶体表现出非常高的机械强度接近各自的金属的理论强度。在目前的工作中，我们已经研究了由固态去湿方法优化生产具有各种形状和尺寸的纳米颗粒的Pt纳米颗粒的抗压强度。颗粒对强度表现出明显的尺寸效应，最小的颗粒达到9.5 GPa的最高压缩强度，对应于Pt的理论强度的下限。然而，由各自的剪切模量归一化的Pt颗粒的平均强度显著低于由类似的去湿方法制造的Au和Ni纳米颗粒的平均强度。我们还建立了颗粒强度和形状之间的相关性，所述颗粒形状由颗粒顶面和投影直径的比率描述。该比值越小，抗压强度越高。根据实验数据，我们制定了一个幂律描述其强度的颗粒大小和形状的综合效果。我们的结果与以前的计算研究定性一致，表明Pt的理论强度由其剪切模量归一化明显低于其他面心立方金属。图形摘要
Several previous studies demonstrated that defect-free faceted nanocrystals of face-centered cubic metals (such as Au, Ni, and Pd) exhibit extraordinarily high mechanical strength approaching the theoretical strength of the respective metals. In the present work, we have studied the compressive strength of Pt nanoparticles fabricated by the solid-state dewetting method optimized for producing nanoparticles with a variety of shapes and sizes. The particles exhibit a well-pronounced size effect on strength, with the smallest particles achieving the highest compressive strength of 9.5 GPa corresponding to the lower limit of the theoretical strength of Pt. However, the average strength of the Pt particles normalized by the respective shear modulus is significantly lower than that of Au and Ni nanoparticles fabricated by a similar dewetting method. We have also established a correlation between the particles strength and shape described by the ratio of the particle top facet and projected diameters. Smaller values of this ratio correlate with higher compressive strength. Based on the experimental data obtained, we formulate a power law describing the combined effect of the particle size and shape on its strength. Our results are in qualitative agreement with previous computational studies demonstrating that the theoretical strength of Pt normalized by its shear modulus is significantly lower than that of other face-centered cubic metals.Graphical abstract