Role of Annealing Temperature, Time, and Composition on the Fabrication of Aux Pd1−x Nanostructures on c-Plane Sapphire by the Solid-State Dewetting of Bimetallic Thin Films
作者： Puran Pandey , Sundar Kunwar , Mao Sui , Sushil Bastola , Jihoon Lee
DOI: 10.1109/TNANO.2018.2801943
关键词:
摘要: Bimetallic nanostructures (BNSs) are important components in various applications due to their elemental composition and morphology dependent catalytic, electronic optical properties. In this paper, the systematic evolution of Au x Pd1− (gold–palladium) BNSs on sapphire (0001) is studied via solid-state dewetting sequentially deposited Au–Pd bilayers along with control composition, annealing temperature, time. Through at temperatures between 400 900 °C, fabrication nanoparticles (NPs) bilayer, voids, observed compositions (Au0.25Pd0.75, Au0.5Pd0.5, Au0.75Pd 0.25). The process systematically analyzed based interdiffusion Pd surface energy minimization mechanism. Along increased rate enhanced, which resulted significantly larger layer- top bimetallic NPs, BNSs. Furthermore, time 0 3600 s, shape transform from elongated round NPs gradually enhanced diffusion. reflectance (UV–VIS–NIR) spectra show tight correlation average decreased temperature dipolar resonance peaks NIR region reveal a gradual blue-shift NP size reduction.
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