Khan Assad U, Guo Yichen, Chen Xi, Liu Guoliang
ACS Nano. 2019 Apr 23;13(4):4255-4266. doi: 10.1021/acsnano.8b09386. Epub 2019 Apr 1.
State-of-the-art commercial light-reflecting glass is coated with a metalized film to decrease the transmittance of electromagnetic waves. In addition to the cost of the metalized film, one major limitation of such light-reflecting glass is the lack of spectral selectivity over the entire visible and near-infrared (NIR) spectrum. To address this challenge, we herein effectively harness the transmittance, reflectance, and filtration of any wavelength across the visible and NIR, by judiciously controlling the planar orientation of two-dimensional plasmonic silver nanoplates (AgNPs) in polymer nanocomposites. In contrast to conventional bulk polymer nanocomposites where plasmonic nanoparticles are randomly mixed within a polymer matrix, our thin-film polymer nanocomposites comprise a single layer, or any desired number of multiple layers, of planarly oriented AgNPs separated by tunable spacings. This design employs a minimal amount of metal and yet efficiently manages light across the visible and NIR. The thin-film plasmonic polymer nanocomposites are expected to have a significant impact on spectral-selective light modulation, sensing, optics, optoelectronics, and photonics.
最先进的商用反光玻璃涂有金属化薄膜，以降低电磁波的透射率。除了金属化薄膜的成本外，这种反光玻璃的一个主要局限性是在整个可见光和近红外（NIR）光谱范围内缺乏光谱选择性。为了应对这一挑战，我们在此通过明智地控制聚合物纳米复合材料中二维等离子体银纳米板（AgNP）的平面取向，有效地利用了可见光和近红外范围内任何波长的透射率、反射率和过滤。与传统的本体聚合物纳米复合材料不同，在传统复合材料中，等离子体纳米颗粒随机混合在聚合物基质中，我们的薄膜聚合物纳米复合材料由单层或任何所需数量的多层平面取向的AgNP组成，这些AgNP由可调间距隔开。这种设计使用了最少的金属量，但却能有效地管理可见光和近红外光。薄膜等离子体聚合物纳米复合材料有望对光谱选择性光调制、传感、光学、光电子学和光子学产生重大影响。
