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Strategies to initiate and control the nucleation behavior of bimetallic nanoparticles.

Abstract

In this work we report strategies to nucleate bimetallic nanoparticles (NPs) made by gas phase synthesis of elements showing difficulty in homogenous nucleation. It is shown that the nucleation assisted problem of bimetallic NP synthesis can be solved via the following pathways: (i) Selecting an element which can itself nucleate and act as a nucleation center for the synthesis of bimetallic NPs. (ii) Introducing H2 or CH4 as an impurity/trace gas to initiate nucleation during synthesis of bimetallic NPs. The latter can solve the problem, when none of the elements in a bimetallic NP can initiate nucleation. We illustrate the above mentioned strategies for the case of Mg based bimetallic NPs, which are interesting as hydrogen storage materials and exhibit both nucleation and oxidation issues even at ultra-high vacuum conditions. In particular, it is shown that by adding H2 in small proportions favour the formation of a solid solution/alloy structure even in the case of immiscible Mg and Ti, where normally phase separation occurs during synthesis. In addition, we illustrate the possibility to improve the nucleation rate, and control the structure and size distribution of bimetallic NPs using H2/CH4 as reactive/nucleating gas. This is shown to be associated with the dimer bond energies of the various formed species and the vapour pressures of the metals, which are key factors for NP nucleation.

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Publication details

The article was received on 07 Feb 2017, accepted on 06 May 2017 and first published on 08 May 2017


Article type: Paper
DOI: 10.1039/C7NR00916J
Citation: Nanoscale, 2017, Accepted Manuscript
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    Strategies to initiate and control the nucleation behavior of bimetallic nanoparticles.

    G. Krishnan, S. de Graaf, G. H. ten Brink, P. PERSSON, B. J. Kooi and G. Palasantzas, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR00916J

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