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自组装的竞争力：耦合ZnO纳米金字塔

Competing Forces in the Self-Assembly of Coupled ZnO Nanopyramids

作者：Elsa Javon;Meriem Gaceur;Walid Dachraoui;Olivier Margeat;Jörg Ackermann;Maria Ilenia Saba;Pietro Delugas;Alessandro Mattoni;Sara Bals;Gustaaf Van Tendeloo;

关键词：self-assembly,dipole−dipole force,ligands,electron tomography,ZnO nanocrystal,model potential molecular dynamics,hybridShow More

DOI：https://doi.org/10.1021/acsnano.5b00809

发表时间：2015年

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摘要

纳米结构的自组装（SA）最近引起了越来越多的关注。由于纳米颗粒的自组装是一个复杂的多尺度现象，包括不同的驱动力，因此对该过程的清晰理解并不简单。在这里，我们通过将无机化学和先进的电子显微技术与原子模拟相结合，研究了铝掺杂ZnO纳米金字塔之间的耦合。我们的结果显示，耦合的纳米金字塔的自组装首先受形态的控制，因为只有在具有良好发育的基面的金字塔的情况下才会发生耦合。电子显微镜和原子建模的结合揭示了耦合进一步受金字塔底部之间的强烈配体-配体相互作用驱动，而Al掺杂或溶剂的筛选效应以及核心-核心相互作用只是次要贡献。我们的综合方法提供了对ZnO纳米金字塔耦合自组装中作用的复杂相互作用的更深入的理解。


Abstract

Self-assembly (SA) of nanostructures has recently gained increasing interest. A clear understanding of the process is not straightforward since SA of nanoparticles is a complex multiscale phenomenon including different driving forces. Here, we study the SA between aluminum doped ZnO nanopyramids into couples by combining inorganic chemistry and advanced electron microscopy techniques with atomistic simulations. Our results show that the SA of the coupled nanopyramids is controlled first by morphology, as coupling only occurs in the case of pyramids with well-developed facets of the basal planes. The combination of electron microscopy and atomistic modeling reveals that the coupling is further driven by strong ligand–ligand interaction between the bases of the pyramids as dominant force, while screening effects due to Al doping or solvent as well as core–core interaction are only minor contributions. Our combined approach provides a deeper understanding of the complex interplay between the interactions at work in the coupled SA of ZnO nanopyramids.


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