Macroscopic Assembly of Gold Nanorods into Superstructures with Controllable Orientations by Anisotropic Affinity Interaction,Langmuir

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Macroscopic Assembly of Gold Nanorods into Superstructures with Controllable Orientations by Anisotropic Affinity Interaction
Langmuir ( IF 3.7 ) Pub Date : 2017-11-22 00:00:00 , DOI: 10.1021/acs.langmuir.7b03538
Yun Rong _{1,

2} , Liping Song _{1,

2} , Peng Si ₃ , Lei Zhang _{1,

2} , Xuefei Lu ₁ , Jiawei Zhang _{1,

2} , Zhihong Nie ₄ , Youju Huang _{1,

2} , Tao Chen _{1,

2}

Affiliation

Two-dimensional or three-dimensional highly ordered arrays of anisotropic nanoparticles provide attracting properties that are highly desired by the industry. Traditional assembly methods such as evaporation usually produces the nanostructure arrays only up to the millimeter scale with poor control of nanoparticle orientation, making them hardly applicable for industrial needs. Here, we report a facile method to assemble centimeter-scale gold nanorod (Au NR) arrays with highly controlled nanoparticle orientation and high reproducibility. We selectively functionalized the transverse or longitudinal facets of Au NRs with polyethylene glycol (PEG) molecules and utilized the interfacial polymeric affinity between the PEG domains on Au NRs and the PEGylated substrate to achieve the anisotropic self-assembly. The side-PEGylated Au NRs formed closely packed horizontal arrays, whereas the end-PEGylated Au NRs formed vertically standing arrays on the substrate, respectively. The obtained Au NR arrays with different orientations showed anisotropic surface-enhanced Raman scattering (SERS) performance. We showed that the vertically ordered Au NR arrays exhibited 3 times higher SERS signals than the horizontally ordered arrays.

中文翻译：

通过各向异性亲和相互作用将金纳米棒宏观组装成具有可控取向的上层结构

各向异性纳米粒子的二维或三维高度有序的阵列提供了业界高度期望的吸引特性。传统的组装方法（例如蒸发法）通常只能产生高达毫米级的纳米结构阵列，并且对纳米粒子的方向控制不佳，因此很难满足工业需求。在这里，我们报告一种简便的方法来组装具有高度受控的纳米粒子方向和高重现性的厘米级金纳米棒（Au NR）阵列。我们选择性地功能化聚乙二醇（PEG）分子的金NRs的横向或纵向刻面，并利用金NRs上的PEG域和PEG化底物之间的界面聚合亲和力来实现各向异性的自组装。侧面PEG化的Au NRs形成紧密堆积的水平阵列，而末端PEG化的Au NRs分别形成在基板上的垂直排列的阵列。所获得的具有不同取向的Au NR阵列表现出各向异性的表面增强拉曼散射（SERS）性能。我们表明，垂直排列的Au NR阵列显示的SERS信号比水平排列的阵列高3倍。

更新日期：2017-11-22

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