Pt-Fe3O4 异二聚体纳米粒子自组装原子排列的纳米粒子超晶格,Journal of the American Chemical Society

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Pt-Fe3O4 异二聚体纳米粒子自组装原子排列的纳米粒子超晶格
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2023-03-13 , DOI: 10.1021/jacs.2c12993
Shengsong Yang ₁ , R Allen LaCour _{2,

3} , Yi-Yu Cai ₄ , Jun Xu ₄ , Daniel J Rosen ₅ , Yugang Zhang ₆ , Cherie R Kagan _{1,

4,

5} , Sharon C Glotzer _{2,

3} , Christopher B Murray _{1,

4}

Affiliation

多组分纳米粒子超晶格 (SL) 有望将具有卓越电子、磁性和光学特性的纳米粒子 (NP) 集成到单一结构中。在这里，我们证明了由两个相连的 NP 组成的异二聚体可以自组装成新型多组分 SL，在单个 NP 的原子晶格之间具有高度对齐，这已被理论化以产生各种显着的特性。具体来说，通过使用模拟和实验，我们表明由较大的 Fe ₃ O _{4域组成的异二聚体在一个顶点装饰有 Pt 域可以自组装成 SL，在 Fe}₃ O ₄之间具有长程原子排列SL 中不同 NP 的域。与未组装的 NP 相比，SL 显示出意外的矫顽力降低。自组装的原位散射揭示了自组装的两阶段机制：NP 之间的平移排序在原子对齐之前发展。我们的实验和模拟表明，原子排列需要在异二聚体合成过程中较小域的选择性外延生长和异二聚体域的特定尺寸比，而不是特定的化学成分。这种成分独立性使得此处阐明的自组装原理适用于未来具有精细结构控制的多组分材料的制备。

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Self-Assembly of Atomically Aligned Nanoparticle Superlattices from Pt–Fe3O4 Heterodimer Nanoparticles

Multicomponent nanoparticle superlattices (SLs) promise the integration of nanoparticles (NPs) with remarkable electronic, magnetic, and optical properties into a single structure. Here, we demonstrate that heterodimers consisting of two conjoined NPs can self-assemble into novel multicomponent SLs with a high degree of alignment between the atomic lattices of individual NPs, which has been theorized to lead to a wide variety of remarkable properties. Specifically, by using simulations and experiments, we show that heterodimers composed of larger Fe₃O₄ domains decorated with a Pt domain at one vertex can self-assemble into an SL with long-range atomic alignment between the Fe₃O₄ domains of different NPs across the SL. The SLs show an unanticipated decreased coercivity relative to nonassembled NPs. In situ scattering of the self-assembly reveals a two-stage mechanism of self-assembly: translational ordering between NPs develops before atomic alignment. Our experiments and simulation indicate that atomic alignment requires selective epitaxial growth of the smaller domain during heterodimer synthesis and specific size ratios of the heterodimer domains as opposed to specific chemical composition. This composition independence makes the self-assembly principles elucidated here applicable to the future preparation of multicomponent materials with fine structural control.

更新日期：2023-03-13

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