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Direct Assembly of Vertically Oriented, Gold Nanorod Arrays
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-29 , DOI: 10.1002/adfm.202006753 Heyou Zhang 1 , Yawei Liu 2 , Muhammad Faris Shahin Shahidan 3 , Calum Kinnear 4 , Fatemeh Maasoumi 1 , Jasper Cadusch 3 , Eser Metin Akinoglu 1 , Timothy D. James 5 , Asaph Widmer‐Cooper 2, 6 , Ann Roberts 3 , Paul Mulvaney 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-29 , DOI: 10.1002/adfm.202006753 Heyou Zhang 1 , Yawei Liu 2 , Muhammad Faris Shahin Shahidan 3 , Calum Kinnear 4 , Fatemeh Maasoumi 1 , Jasper Cadusch 3 , Eser Metin Akinoglu 1 , Timothy D. James 5 , Asaph Widmer‐Cooper 2, 6 , Ann Roberts 3 , Paul Mulvaney 1
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Although many nanoscale materials such as quantum dots and metallic nanocrystals exhibit size dependent optical properties, it has been difficult to incorporate them into optical or electronic devices because there are currently no methods for precise, large‐scale deposition of single nanocrystals. Of particular interest is the need to control the orientation of single nanocrystals since the optical properties are usually strongly anisotropic. Here a method based on electrophoretic deposition (EPD) is reported to precisely assemble vertically oriented, single gold nanorods. It is demonstrated that the orientation of gold nanorods during deposition is controlled by the electric dipole moment induced along the rod by the electric field. Dissipative particle dynamics simulations indicate that the magnitude of this dipole moment is dominated by the polarizability of the solution phase electric double layer around the nanorod. The resulting vertical gold nanorod arrays exhibit reflected colors due to selective excitation of the transverse surface plasmon mode. The EPD method allows assembly of arrays with a density of over one million, visually resolvable, vertical nanorods per square millimeter.
中文翻译：
垂直定向的金纳米棒阵列的直接组装
尽管许多纳米级材料（例如量子点和金属纳米晶体）表现出与尺寸相关的光学特性，但由于目前尚无用于精确，大规模沉积单个纳米晶体的方法，因此很难将它们纳入光学或电子设备中。特别令人感兴趣的是需要控制单个纳米晶体的取向，因为光学性质通常是强烈各向异性的。在这里，据报道一种基于电泳沉积（EPD）的方法可以精确地组装垂直定向的单个金纳米棒。结果表明，金纳米棒在沉积过程中的取向受电场沿棒沿电极感应的电偶极矩的控制。耗散粒子动力学模拟表明，偶极矩的大小主要由纳米棒周围固溶相双电层的极化率决定。由于横向表面等离子体激元模式的选择性激发，所得的垂直金纳米棒阵列表现出反射的颜色。EPD方法允许以每平方毫米1百万个以上视觉上可分辨的垂直纳米棒的密度组装阵列。
更新日期：2020-10-29
中文翻译：
垂直定向的金纳米棒阵列的直接组装
尽管许多纳米级材料（例如量子点和金属纳米晶体）表现出与尺寸相关的光学特性，但由于目前尚无用于精确，大规模沉积单个纳米晶体的方法，因此很难将它们纳入光学或电子设备中。特别令人感兴趣的是需要控制单个纳米晶体的取向，因为光学性质通常是强烈各向异性的。在这里，据报道一种基于电泳沉积（EPD）的方法可以精确地组装垂直定向的单个金纳米棒。结果表明，金纳米棒在沉积过程中的取向受电场沿棒沿电极感应的电偶极矩的控制。耗散粒子动力学模拟表明，偶极矩的大小主要由纳米棒周围固溶相双电层的极化率决定。由于横向表面等离子体激元模式的选择性激发，所得的垂直金纳米棒阵列表现出反射的颜色。EPD方法允许以每平方毫米1百万个以上视觉上可分辨的垂直纳米棒的密度组装阵列。
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