近晶液晶拓扑缺陷中的取向金纳米棒和金纳米棒链,ACS Nano

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近晶液晶拓扑缺陷中的取向金纳米棒和金纳米棒链
ACS Nano ( IF 15.8 ) Pub Date : 2017-06-22 00:00:00 , DOI: 10.1021/acsnano.7b01132
Brigita Rožič ₁ , Jérôme Fresnais ₂ , Celine Molinaro ₃ , Joseph Calixte ₁ , Shivakumar Umadevi ₄ , Stephanie Lau-Truong ₅ , Nordin Felidj ₅ , Tobias Kraus ₆ , Fabrice Charra ₃ , Vincent Dupuis ₂ , Torsten Hegmann ₇ , Celine Fiorini-Debuisschert ₃ , Bruno Gallas ₁ , Emmanuelle Lacaze ₁

Affiliation

我们表明，使用近晶A缺陷的定向线性阵列，即所谓的近晶油性条纹，可以使金纳米棒（GNR）的取向在很大的GNR直径范围内（从7到48 nm不等），并适用于各种配体。对于小的GNR它使定向的GNR的端至端的小链当密度从约2的GNR个/μm增加到²至约6的GNR个/μm ²。我们已经通过分光光度法和双光子发光（TPL）表征了单个GNR的取向。观察到复合材料的强烈各向异性吸收和GNR发光的开-关切换，这两者均受入射光偏振控制，这揭示了GNR的取向大体上平行于油性条纹。因此，对于带状缺陷，证实了近晶位错对GNR的更有利的捕获。位错似乎局限在特定的位置，即旋转晶界的顶点。结合等离子体吸收测量，TPL测量和等离子体吸收模拟，我们发现端到端GNR链既是二聚体又是三聚体，它们彼此平行，在耦合的GNR之间有很小的间隙，顺序1.5 nm，因此与纵向等离激元模式的110 nm的大红移有关。GNR沿着位错的运动似乎是形成端到端GNR链的必要成分，间隙值是由吸引范德华相互作用和GNR之间的空间排斥之间的平衡驱动的，并导致相邻配体的叉指。因此，我们获得了受光偏振控制的纳米棒的电磁耦合。间隙值是由吸引范德华相互作用和GNR之间的空间排斥之间的平衡驱动的，并导致相邻配体的相互交叉。因此，我们获得了受光偏振控制的纳米棒的电磁耦合。间隙值是由吸引范德华相互作用和GNR之间的空间排斥之间的平衡驱动的，并导致相邻配体的相互交叉。因此，我们获得了受光偏振控制的纳米棒的电磁耦合。

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Oriented Gold Nanorods and Gold Nanorod Chains within Smectic Liquid Crystal Topological Defects

We show that the use of oriented linear arrays of smectic A defects, the so-called smectic oily streaks, enables the orientation of gold nanorods (GNRs) for a large range of GNR diameters, ranging from 7 to 48 nm, and for various ligands. For the small GNRs it enables oriented end-to-end small chains of GNRs when the density is increased from around 2 GNRs/μm² to around 6 GNRs/μm². We have characterized the orientation of single GNRs by spectrophotometry and two-photon luminescence (TPL). A strongly anisotropic absorption of the composites and an on–off switching of GNR luminescence, both controlled by incident light polarization, are observed, revealing an orientation of the GNRs mostly parallel to the oily streaks. A more favorable trapping of GNRs by smectic dislocations with respect to ribbon-like defects is thus demonstrated. The dislocations appear to be localized at a specific localization, namely, the summit of rotating grain boundaries. Combining plasmonic absorption measurements, TPL measurements, and simulation of the plasmonic absorption, we show that the end-to-end GNR chains are both dimers and trimers, all parallel to each other, with a small gap between the coupled GNRs, on the order of 1.5 nm, thus associated with a large red-shift of 110 nm of the longitudinal plasmonic mode. A motion of the GNRs along the dislocations appears as a necessary ingredient for the formation of end-to-end GNR chains, the gap value being driven by the balance between the attracting van der Waals interactions and the steric repulsion between the GNRs and leading to interdigitation of the neighboring ligands. We thus obtain electromagnetic coupling of nanorods controlled by light polarization.

更新日期：2017-06-22

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