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首页> 外文期刊>RSC Advances >Compositional effect on the fabrication of AgxPd1?x alloy nanoparticles on c-plane sapphire at distinctive stages of the solid-state-dewetting of bimetallic thin films
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Compositional effect on the fabrication of AgxPd1?x alloy nanoparticles on c-plane sapphire at distinctive stages of the solid-state-dewetting of bimetallic thin films

机译：组成对在 c x Pd 1？ x 合金纳米粒子的影响>-平面蓝宝石处于双金属薄膜固态去湿的独特阶段

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摘要

Bimetallic nanoparticles (BMNPs) exhibit composition, dimension and configuration dependent optical, catalytic and magnetic properties, which can make them promising candidates for various applications. In this paper, the AgxPd1?x bilayer composition effect, i.e. Ag0.75Pd0.25, Ag0.50Pd0.50 and Ag0.25Pd0.75, on the evolution of AgxPd1?x BMNPs is thoroughly investigated on c-plane sapphire by the control of annealing temperature, duration and deposition thickness. Bimetallic nanoparticles of various dimensions and configurations are fabricated at different dewetting stages by the thermal activation, diffusion and inter-mixing of Ag–Pd adatoms with respect to the growth conditions. With elevated annealing temperature, the gradual transition from voids to nanoclusters and individual BMNPs is demonstrated based on the surface and interface energy minimization and Volmer–Weber growth model. Owing to the high diffusivity of Ag atoms, the bilayers with the higher Ag component show improved dewetting at relatively low temperature whereas the high Pd composition set shows an increased stability against dewetting. Meanwhile, the transition of BMNPs from connected to individual and compact spherical configuration is witnessed along with extended annealing duration. At the same time, a significant dimensional expansion of NPs is achieved with increased deposition thickness. On the other hand, the Ag concentration from BMNPs is reduced due to sublimation at high temperature, which causes overall size attenuation. Moreover, the fabricated AgxPd1?x BMNPs are characterized based on their reflectance spectra and the evolution of their absorption band, peak formation and their shifts are correlated with the dynamic surface plasmon resonance of AgxPd1?x BMNPs based on the surface morphology.
机译：双金属纳米颗粒（BMNP）表现出与组成，尺寸和构型有关的光学，催化和磁性，这使其成为各种应用的有前途的候选者。本文中的Ag x Pd 1？ x < / small>双层成分效应，即 Ag 0.75 Pd 0.25 ，Ag < small> 0.50 Pd 0.50 和Ag 0.25 Pd 0.75 ，关于Ag x Pd 1的演化？通过控制退火温度，持续时间和沉积厚度，对 c 平面蓝宝石上的 x BMNPs进行了深入研究。通过对Ag-Pd吸附原子进行热活化，扩散和相互混合，可以在不同的去湿阶段制备各种尺寸和构造的双金属纳米颗粒，具体取决于生长条件。随着退火温度的升高，基于表面和界面能最小化和Volmer–Weber生长模型，证明了从空隙到纳米团簇和单个BMNP的逐渐过渡。由于Ag原子的高扩散性，具有较高Ag组分的双层在相对较低的温度下显示出改善的反润湿性，而高Pd组成组显示出对反润湿性的增强的稳定性。同时，随着退火时间的延长，可以看到BMNP从连接转变为单个的紧凑球形结构。同时，随着沉积厚度的增加，NPs的尺寸大大扩展。另一方面，由于在高温下升华，来自BMNP的Ag浓度降低，这导致整体尺寸减小。此外，制造的Ag x Pd 1？ x small> BMNPs的特征在于其反射光谱，其吸收带的演化，峰的形成和位移与Ag x Pd 1？ x BMNP。

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