Suzhou Key Laboratory of Nanobiomedical Characterization, Division of Nanobiomedicine and i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.
J Am Chem Soc. 2013 Aug 7;135(31):11441-4. doi: 10.1021/ja404354c. Epub 2013 Jul 29.
Discrete three-dimensional (3D) plasmonic nanoarchitectures with well-defined spatial configuration and geometry have aroused increasing interest, as new optical properties may originate from plasmon resonance coupling within the nanoarchitectures. Although spherical building blocks have been successfully employed in constructing 3D plasmonic nanoarchitectures because their isotropic nature facilitates unoriented localization, it still remains challenging to assemble anisotropic building blocks into discrete and rationally tailored 3D plasmonic nanoarchitectures. Here we report the first example of discrete 3D anisotropic gold nanorod (AuNR) dimer nanoarchitectures formed using bifacial DNA origami as a template, in which the 3D spatial configuration is precisely tuned by rationally shifting the location of AuNRs on the origami template. A distinct plasmonic chiral response was experimentally observed from the discrete 3D AuNR dimer nanoarchitectures and appeared in a spatial-configuration-dependent manner. This study represents great progress in the fabrication of 3D plasmonic nanoarchitectures with tailored optical chirality.
具有明确定义的空间配置和几何形状的离散三维（3D）等离子体纳米结构引起了越来越多的兴趣，因为新的光学性质可能源于纳米结构内的等离子体共振耦合。尽管球形构建块由于各向同性性质有利于无定向定位而成功地用于构建 3D 等离子体纳米结构，但将各向异性构建块组装成离散且合理定制的 3D 等离子体纳米结构仍然具有挑战性。在这里，我们报告了第一个使用双面 DNA 折纸作为模板形成离散 3D 各向异性金纳米棒（AuNR）二聚体纳米结构的示例，其中通过合理地在折纸模板上移动 AuNR 的位置来精确调整 3D 空间配置。从离散的 3D AuNR 二聚体纳米结构中实验观察到明显的等离子体手性响应，并且以空间构型依赖的方式出现。这项研究代表了在制造具有定制光学手性的 3D 等离子体纳米结构方面取得了重大进展。
