Department of Applied Physics and Applied Mathematics, Columbia University, Mudd 200, MC 4701, 500 W 120 Street, New York, NY, 10027, USA.
Department of Materials Science and Engineering, Stanford University, 496 Lomita Mall, Stanford, CA, 94305-4034, USA.
Adv Mater. 2017 Nov;29(41). doi: 10.1002/adma.201702156. Epub 2017 Aug 28.
A galvanic-displacement-reaction-based, room-temperature "dip-and-dry" technique is demonstrated for fabricating selectively solar-absorbing plasmonic-nanoparticle-coated foils (PNFs). The technique, which allows for facile tuning of the PNFs' spectral reflectance to suit different radiative and thermal environments, yields PNFs which exhibit excellent, wide-angle solar absorptance (0.96 at 15°, to 0.97 at 35°, to 0.79 at 80°), and low hemispherical thermal emittance (0.10) without the aid of antireflection coatings. The thermal emittance is on par with those of notable selective solar absorbers (SSAs) in the literature, while the wide-angle solar absorptance surpasses those of previously reported SSAs with comparable optical selectivities. In addition, the PNFs show promising mechanical and thermal stabilities at temperatures of up to 200 °C. Along with the performance of the PNFs, the simplicity, inexpensiveness, and environmental friendliness of the "dip-and-dry" technique makes it an appealing alternative to current methods for fabricating selective solar absorbers.
一种基于电置换反应的室温“浸涂干燥”技术被用于制备选择性太阳能吸收的等离子体纳米粒子涂层箔（PNF）。该技术可以轻松地调整 PNF 的光谱反射率以适应不同的辐射和热环境，得到的 PNF 具有极好的宽角度太阳能吸收率（在 15°时为 0.96，在 35°时为 0.97，在 80°时为 0.79）和低半球形热发射率（0.10），而无需使用抗反射涂层。其热发射率与文献中著名的选择性太阳能吸收体（SSA）相当，而宽角度太阳能吸收率超过了具有可比光学选择性的先前报道的 SSA。此外，PNF 在高达 200°C 的温度下表现出良好的机械和热稳定性。除了 PNF 的性能之外，“浸涂干燥”技术的简单、经济和环保使其成为当前制备选择性太阳能吸收体的方法的一个有吸引力的替代方案。
