Plasmonic Biomimetic Nanocomposite with Spontaneous Subwavelength Structuring as Broadband Absorbers
Plasmonic Biomimetic Nanocomposite with Spontaneous Subwavelength Structuring as Broadband Absorbers
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DOI：
10.1021/acsenergylett.8b00583
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发表时间：
2018-07-01
影响因子：
22
通讯作者：
Kotov, Nicholas A.
中科院分区：
文献类型：
--
作者：
Li, Mingzhu;Guler, Urcan;Kotov, Nicholas A.
宽带等离子体吸收器是光伏、光热和发光器件的重要组成部分。它们通常通过光刻工艺制成，将亚波长尺寸的平面外表面特征赋予金属薄膜。然而，由于高温加工和这些材料的化学稳定性，廉价等离子体陶瓷（例如 TiN）的光刻亚波长图案化具有挑战性。在这项工作中，我们表明，TiN 等离子体纳米颗粒与聚电解质的逐层组装（LbL）会导致自发形成亚波长尺寸的面外形貌。这些波纹涂层的柱状形态及其等离激元功能导致宽带吸收能力，例如光谱中紫外线到红外线部分的 90% 的光被吸收。该方法适用于具有复杂几何形状的大型、柔性、共形表面。它还快速、可扩展且环保。 TiN 纳米粒子的 LBL 处理证明了在光子超表面制造中用随机自组装工艺替代光刻图案的可能性。
Broadband plasmonic absorbers are essential components for photovoltaic, photothermal, and light-emitting devices. They are often made by lithographic processes that impart out-of plane surface features with subwavelength dimensions to metallic films. However, lithographic subwavelength patterning of inexpensive plasmonic ceramics, such as TiN, is challenging because of high temperature processing and the chemical robustness of these materials. In this work, we show that layer-by-layer assembly (LbL) of TiN plasmonic nanoparticles with polyelectrolytes results in spontaneous formation of out-of-plane topography with subwavelength dimensions. The columnar morphology of these corrugated coatings and their plasmonic functionality results in broadband absorption capabilities exemplified by 90% of the light from the ultraviolet to infrared parts of the spectrum being absorbed. The method is applicable to large, flexible, and conformal surfaces with complex geometry. It is also fast, scalable, and environmentally friendly. LBL processing of TiN nanoparticles demonstrates the possibility of replacement of lithographic patterning with stochastic self-assembly processes in manufacturing of photonic metasurfaces.