Nydegger Mirco, Deshmukh Rupali, Tervoort Elena, Niederberger Markus, Caseri Walter
Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland.
Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, OSUA/205, 5232 Villigen, Switzerland.
ACS Omega. 2019 Jun 27;4(6):11223-11228. doi: 10.1021/acsomega.9b01077. eCollection 2019 Jun 30.
Agglomeration of copper nanowires (aspect ratios on the order of 1000) in polyethylene, commonly a major problem, could be prevented by modification of the nanowires with a surface layer of oleylamine. Nanocomposite films were prepared by mixing nanowire dispersions in organic solvents with polyethylene solutions followed by casting, drying, and sometimes hot pressing. Orientation of the copper nanowires by solid-state drawing of the composites at elevated temperatures led to preferential alignment of the nanowires in the drawing direction. This arrangement gave rise to a uniform dichroism in the near-infrared (NIR) region, which is uncommon in the case of the hitherto reported dichroic nanocomposites. The NIR dichroism is ascribed to the high aspect ratio of the metal wires. Hence, drawing of isotropic nanocomposites with metal wires may serve for the manufacture of NIR polarization filters.
在聚乙烯中，铜纳米线（长径比约为1000）的团聚通常是一个主要问题，而通过用油酸胺表面层对纳米线进行改性可以防止这种团聚。通过将纳米线在有机溶剂中的分散体与聚乙烯溶液混合，然后进行浇铸、干燥，有时还进行热压，制备了纳米复合薄膜。在高温下通过对复合材料进行固态拉伸使铜纳米线取向，导致纳米线在拉伸方向上优先排列。这种排列在近红外（NIR）区域产生了均匀的二向色性，这在迄今为止报道的二向色性纳米复合材料中并不常见。近红外二向色性归因于金属线的高长径比。因此，用金属线对各向同性纳米复合材料进行拉伸可用于制造近红外偏振滤光片。
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