A physical mixture of polymer‐protected Ag nanoparticles and Rh, Pd, or Pt nanoparticles spontaneously forms Ag‐core bimetallic nanoparticles. The formed nanoparticles were smaller than the parent Ag nanoparticles. In the initial process of this reaction, the surface plasmon absorption of Ag nanoparticles diminished and then almost ceased within one hour. Within several minutes, the decrease in Ag surface plasmon absorption could be analyzed by second‐order reaction. This reaction was accelerated with an increase of temperature and the energy gap in the Fermi level between Ag and the other metals. The activation energy (E_a) of this reaction could be determined. An electron transfer reaction from Ag to other metal nanoparticles was proposed as the initial interaction between these metal nanoparticles because the Fermi level of Ag is relatively high, and the electron transfer is possible in terms of energy. The Marcus plot between the rate constant and the driving force, roughly estimated from the work function of metals, and the observed E_a values reasonably explained the proposed electron transfer mechanism.

中文翻译：

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银和贵金属纳米粒子之间自发双金属化的动力学

聚合物保护的Ag纳米颗粒与Rh，Pd或Pt纳米颗粒的物理混合物自发形成Ag核双金属纳米颗粒。所形成的纳米颗粒小于母体Ag纳米颗粒。在该反应的初始过程中，Ag纳米粒子的表面等离子体吸收降低，然后在一小时内几乎停止。在几分钟内，可以通过二阶反应分析Ag表面等离激元吸收的减少。随着温度的升高和银与其他金属之间费米能级的能隙的增加，该反应得以加速。活化能（E _a可以确定该反应。提出了从Ag到其他金属纳米粒子的电子转移反应作为这些金属纳米粒子之间的初始相互作用，因为Ag的费米能级相对较高，并且就能量而言电子转移是可能的。速率常数和驱动力之间的马库斯图（根据金属的功函数粗略估计）和观测到的E _a值合理地解释了拟议的电子转移机理。