Polyhedral plasmonic nanoclusters through multi-step colloidal chemistry,Materials Horizons

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Polyhedral plasmonic nanoclusters through multi-step colloidal chemistry
Materials Horizons ( IF 12.2 ) Pub Date : 2020-11-11 , DOI: 10.1039/d0mh01311k
Nabila Tanjeem ₁ , Cyril Chomette , Nicholas B Schade , Serge Ravaine , Etienne Duguet , Mona Tréguer-Delapierre , Vinothan N Manoharan

Affiliation

We describe a new approach to making plasmonic metamolecules with well-controlled resonances at optical wavelengths. Metamolecules are highly symmetric, subwavelength-scale clusters of metal and dielectric. They are of interest for metafluids, isotropic optical materials with applications in imaging and optical communications. For such applications, the morphology must be precisely controlled: the optical response is sensitive to nanometer-scale variations in the thickness of metal coatings and the distances between metal surfaces. To achieve this precision, we use a multi-step colloidal synthesis approach. Starting from highly monodisperse silica seeds, we grow octahedral clusters of polystyrene spheres using seeded-growth emulsion polymerization. We then overgrow the silica and remove the polystyrene to create a dimpled template. Finally, we attach six silica satellites to the template and coat them with gold. Using single-cluster spectroscopy, we show that the plasmonic resonances are reproducible from cluster to cluster. By comparing the spectra to theory, we show that the multi-step synthesis approach can control the distances between metallic surfaces to nanometer-scale precision. More broadly, our approach shows how metamolecules can be produced in bulk by combining different, high-yield colloidal synthesis steps, analogous to how small molecules are produced by multi-step chemical reactions.

中文翻译：

通过多步胶体化学形成多面体等离子体纳米团簇

我们描述了一种在光波长下制造具有良好控制共振的等离子体超分子的新方法。元分子是高度对称的亚波长级金属和电介质簇。它们对超流体、各向同性光学材料在成像和光通信中的应用很感兴趣。对于此类应用，必须精确控制形态：光学响应对金属涂层厚度和金属表面之间距离的纳米级变化敏感。为了达到这种精度，我们使用了多步胶体合成方法。从高度单分散的二氧化硅种子开始，我们使用种子生长乳液聚合生长聚苯乙烯球的八面体簇。然后我们过度生长二氧化硅并去除聚苯乙烯以创建凹坑模板。最后，我们将六颗二氧化硅卫星附加到模板上并涂上金。使用单簇光谱，我们表明等离子体共振在簇与簇之间是可重现的。通过将光谱与理论进行比较，我们表明多步合成方法可以将金属表面之间的距离控制在纳米级精度。更广泛地说，我们的方法展示了如何通过组合不同的高产胶体合成步骤来批量生产大分子，类似于如何通过多步化学反应生产小分子。我们表明多步合成方法可以将金属表面之间的距离控制到纳米级精度。更广泛地说，我们的方法展示了如何通过组合不同的高产胶体合成步骤来批量生产大分子，类似于如何通过多步化学反应生产小分子。我们表明多步合成方法可以将金属表面之间的距离控制到纳米级精度。更广泛地说，我们的方法展示了如何通过组合不同的高产胶体合成步骤来批量生产大分子，类似于如何通过多步化学反应生产小分子。

更新日期：2020-11-27

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