Investigation of Formation Mechanism of Pt(111) Nanoparticle Layers Grown on Ru(0001) Core

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• 作者：Hung-lung Chou ; Feng-Ju Lai ; Wei-Nien Su ; K.Chandrasekara Pillai ; Loka Subramanyam Sarma ; Bing-Joe Hwang
• 刊名：Langmuir
• 出版年：2011
• 出版时间：February 1, 2011
• 年：2011
• 卷：27
• 期：3
• 页码：1131-1135
• 全文大小：827K
• 年卷期：v.27,no.3(February 1, 2011)
• ISSN：1520-5827

文摘

A layer growth mechanism of Pt鈭扲u bimetallic nanoparticles has been proposed with supporting experiments and calculations by density functional theory (DFT). Elongated Pt atoms on Ru nanoparticles were synthesized via a two-step route, and their structural details were obtained by high-resolution transmission electron microscopy. Because of the intrinsic mismatch of lattice spacing between the two elements, such an unusual growth was analyzed with the DFT simulations to explore the mystery of the growth mechanism. Pt atoms would rearrange the packing order and adjust the Pt鈭扨t atomic distance, and so do the Ru nanoparticles in order to achieve the optimal energy status of the bimetallic system. The resultant Pt(111) layers could stack on top of the Ru(0001) core more tightly by fitting the pockets left between the Ru atoms. The findings give insight into the formation mechanism of the nanosized Pt鈭扲u bimetallic catalyst and pave the way for designing bimetallic catalysts with tailored properties at the atomic level.