Nematic director-induced switching of assemblies of hexagonally packed gold nanorods.
Nematic director-induced switching of assemblies of hexagonally packed gold nanorods.
复制标题
向列导向器诱导的六方堆积金纳米棒组件的切换。
DOI：
10.1002/adma.201201319
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Thomas MR
中科院分区：
文献类型：
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作者：
Thomas MR
利用施加的电场来控制和重新配置分散在流体相中的各向异性纳米级物体的取向的能力仍然是开发具有改进的单轴性质的新材料的重要目标。这种功能流体具有可切换的光学吸收和双折射性质，因此在新型电光应用的开发中具有相当重要的意义。因此，基于纳米颗粒的复杂流体的系统设计和构造是一个新兴的研究活动领域。[1-6]在各向同性溶剂中，合适的纳米颗粒的选择对于电场取向是有限的，因为它对颗粒的纵横比和电极化率高度敏感。货车der Zande等人证明了电场诱导的各向异性等离子体粒子在有机溶剂中的排列可以导致可切换的二向色性复合材料。[5]他们探索了介电溶剂中不同纵横比的金纳米棒（GNR）的场诱导排列，并报告说纵横比为2.6的GNR在高达0.05 V μm− 1（RMS）的AC场强下不会发生排列。最近，Golovin等人能够证明纵横比为2.5的GNR可以在介电溶剂中排列，以产生具有可切换折射率的复合超材料，尽管需要10 V μm− 1的电场。[6]美国
The ability to exploit applied electric fields to control and reconfigure the orientation of anisotropic nanoscale objects dispersed in fluid phases remains an important objective for the development of new materials with improved uniaxial properties. Such functional fluids have switchable optical absorption and birefringence properties, and are therefore of considerable importance in the development of novel electro-optic applications. As a consequence, the systematic design and construction of nanoparticle-based complex fluids is an area of burgeoning research activity.[1–6] In isotropic solvents, the choice of suitable nanoparticles is limited for electric field alignment because it is highly sensitive to the aspect ratio and electric polarizability of the particles. Van der Zande et al. demonstrated that the electric field induced alignment of anisotropic plasmonic particles in organic solvents could lead to switchable dichroic composites.[5] They explored the field-induced alignment of gold nanorods (GNRs) of various aspect ratios in dielectric solvents, and reported that alignment of GNRs with aspect ratios of 2.6 did not occur at AC field strengths of up to 0.05 V μm− 1 (RMS). More recently, Golovin et al. were able to demonstrate that GNRs with an aspect ratio of 2.5 could be aligned in dielectric solvents to produce composite metamaterials with switchable refractive indices, although electric fields as large as 10 V μm− 1 were necessary.[6]