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Surface faceting and compositional evolution of Pd@Au core−shell nanocrystals during in situ annealing

Abstract

Bimetallic core-shell nanoparticles have received considerable attention for their unique optical, magnetic, and catalytic properties. However, these properties will be dramatically modified under ambient conditions by their structure and/or composition changing. Thus, it is of primary importance to study the complex transformation pathway of core-shell nanoparticles at elevated temperature. In this work, by using an aberration-corrected scanning transmission electron microscope equipped with energy dispersive X-ray mapping, the complete transformation process from a well-designed Pd@Au core-shell nanoparticle to a uniform alloy particle was visualized. It is revealed that this transformation process went through three steps, i.e., surface refacetting, particle resphering and complete alloying. Combining with a developed atomic kinetic Monte Carlo simulation, we found that surface energy is the driving force of shape variation, the different atomic activation barriers of surface diffusion and bulk migration results in the multistep transformation pathway. Our results offered important information for understanding the structure evolution of bimetallic core-shell nanoparticles, which is beneficial for the rational design of nanoparticles with kinetic stability.

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Supplementary files

Publication details

The article was received on 12 Dec 2018, accepted on 11 Jan 2019 and first published on 12 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP07576J
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript
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    Surface faceting and compositional evolution of Pd@Au core−shell nanocrystals during in situ annealing

    Z. Wu, M. Tang, X. Li, S. Luo, W. Yuan, B. Zhu, H. Zhang, H. Yang, Y. Gao and Y. Wang, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C8CP07576J

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