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Two-dimensional gold trisoctahedron nanoparticle superlattice sheets: self-assembly, characterization and immunosensing applications†
Nanoscale ( IF 5.8 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1039/c7nr09443d Dashen Dong 1, 2, 3, 4, 5 , Lim Wei Yap 1, 2, 3, 4, 5 , Detlef M. Smilgies 6, 7, 8 , Kae Jye Si 1, 2, 3, 4, 5 , Qianqian Shi 1, 2, 3, 4, 5 , Wenlong Cheng 1, 2, 3, 4, 5
Nanoscale ( IF 5.8 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1039/c7nr09443d Dashen Dong 1, 2, 3, 4, 5 , Lim Wei Yap 1, 2, 3, 4, 5 , Detlef M. Smilgies 6, 7, 8 , Kae Jye Si 1, 2, 3, 4, 5 , Qianqian Shi 1, 2, 3, 4, 5 , Wenlong Cheng 1, 2, 3, 4, 5
Affiliation
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Nanoparticles were called “artificial atoms” about two decades ago due to their ability to organize into regular lattices or supracrystals. Their self-assembly into free-standing, two-dimensional (2D) nanoparticle arrays enables the generation of 2D metamaterials for novel applications in sensing, nanophotonics and energy fields. However, their controlled fabrication is nontrivial due to the complex nanoscale forces among nanoparticle building blocks. Here, we report a new type of 2D plasmonic superlattice from high-index gold trisoctahedron (TOH) nanoparticles. TOH is an anisotropic polyhedron with 24 facets and 14 vertices. By using polymer ligands in conjunction with drying-mediated self-assembly, we obtained highly ordered 2D superlattices as quantified by synchrotron based grazing-incidence small-angle X-ray scattering (GISAXS). The plasmonic properties were optimized by adjusting the ligand length and particle size. The excellent surface-enhanced Raman scattering (SERS) performance enables us to demonstrate TOH superlattices as uniform SERS immunosubstrates with a detection limit down to 1 pg ml−1 and a dynamic range from 1 pg ml−1 to 100 ng ml−1.
中文翻译：
二维三八面体金纳米颗粒超晶格片：自组装，表征和免疫传感应用†
纳米粒子由于能够组织成规则的晶格或超晶体而被称为“人造原子”，大约在二十年前。它们自组装成独立的二维（2D）纳米粒子阵列，从而能够生成2D超材料，用于传感，纳米光子学和能量领域的新型应用。然而，由于纳米粒子构件之间复杂的纳米级力，它们的受控制造是不平凡的。在这里，我们报道了一种由高折射率金三八面体（TOH）纳米粒子构成的新型二维等离子体超晶格。TOH是具有24个小平面和14个顶点的各向异性多面体。通过将聚合物配体与干燥介导的自组装结合使用，我们获得了高度有序的二维超晶格，该二维晶格通过基于同步加速器的掠入射小角X射线散射（GISAXS）进行了定量。通过调节配体的长度和粒径优化了等离子体性能。出色的表面增强拉曼散射（SERS）性能使我们能够证明TOH超晶格是均匀的SERS免疫底物，检测限低至1 pg ml-1和1 pg ml -1到100 ng ml -1的动态范围。
更新日期：2018-03-05
中文翻译：
二维三八面体金纳米颗粒超晶格片：自组装，表征和免疫传感应用†
纳米粒子由于能够组织成规则的晶格或超晶体而被称为“人造原子”，大约在二十年前。它们自组装成独立的二维（2D）纳米粒子阵列，从而能够生成2D超材料，用于传感，纳米光子学和能量领域的新型应用。然而，由于纳米粒子构件之间复杂的纳米级力，它们的受控制造是不平凡的。在这里，我们报道了一种由高折射率金三八面体（TOH）纳米粒子构成的新型二维等离子体超晶格。TOH是具有24个小平面和14个顶点的各向异性多面体。通过将聚合物配体与干燥介导的自组装结合使用，我们获得了高度有序的二维超晶格，该二维晶格通过基于同步加速器的掠入射小角X射线散射（GISAXS）进行了定量。通过调节配体的长度和粒径优化了等离子体性能。出色的表面增强拉曼散射（SERS）性能使我们能够证明TOH超晶格是均匀的SERS免疫底物，检测限低至1 pg ml-1和1 pg ml -1到100 ng ml -1的动态范围。
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