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DNA Origami-Guided Assembly of the Roundest 60-100 nm Cold Nanospheres into Plasmonic Metamolecules

机译:DNA折纸引导的最圆的60-100 nm冷纳米球组装成等离子体胶大分子

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摘要

DNA origami can provide programmed information to guide the self-assembly of gold nanospheres (Au NSs) into higher-order supracolloids. Molecularly precise and truly 2D/3D integration of Au NSs is possible using DNA origami-enabled assembly, and the resulting assemblies have potential applications in plasmonics and metamaterials. However, the relatively small size (60 nm) and randomly faceted Au NSs that have been used thus far in DNA origami-enabled assembly have limited their nanophotonic applications. Here, the robust self-assembly of the 60-100 nm roundest Au NSs into metamolecular assemblies using 3D DNA origami is described. These Au NSs are successfully conjugated with DNA oligonucleotides and are therefore stable at high salt concentrations even without backfilling using organic ligands. The roundest Au NSs are successfully assembled into supracolloidal metamolecules and chains via 3D DNA origami. These plasmonic metamolecules and chains display strong electric and unnatural magnetic resonances that can be deterministically controlled.
机译:DNA折纸可提供程序化信息,以指导金纳米球(Au NSs)的自组装成高阶超胶体。使用DNA折纸启用的组件,可以实现Au NSs的分子精确且真正的2D / 3D集成,并且所得组件在等离子和超材料中具有潜在的应用。但是,迄今为止,在DNA折纸启用的组件中已使用的相对较小的尺寸(<60 nm)和随机刻面的Au NSs限制了其纳米光子应用。在这里,描述了使用3D DNA折纸将60-100 nm最圆的Au NSs牢固地组装成大分子组装体的过程。这些Au NSs已成功与DNA寡核苷酸偶联,因此即使在不使用有机配体进行回填的情况下,也能在高盐浓度下稳定。最圆的Au NSs通过3D DNA折纸成功地组装成胶体上大分子和链。这些等离激元大分子和链显示出强大的电和非自然磁共振,可以确定地对其进行控制。

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