Structural Analysis of AuPdAu Nanocubes via Aberration-Corrected STEM and Nanobeam Diffraction

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• 作者：Alejandra Londono-Calderon ; Alina Bruma ; Daniel Bahena Uribe ; Arturo Ponce ; Miguel Jos茅-Yacam谩n
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：October 29, 2015
• 年：2015
• 卷：119
• 期：43
• 页码：24621-24626
• 全文大小：389K
• ISSN：1932-7455

文摘

Controlling the morphology of bimetallic nanoscale systems at the atomic level is of utmost importance in fields such as nanocatalysis, plasmonics, or optics. In this report we emphasize an experimental observation of superlattice formation in bimetallic gold鈥損alladium nanocubes of the order of 30 nm synthesized by a seed-mediated growth method. By combining our experimental observations based on high-angle annular dark-field scanning transmission electron microscopy and nanobeam diffraction, we have established that a process of galvanic replacement takes place in our third deposition step, triggering the formation of vacancies and atomic diffusion, triggering short-range ordering in our three-layer AuPdAu nanocubes.