Gao Junhua, Tu Chengjun, Liang Lingyan, Zhang Hongliang, Zhuge Fei, Wu Liang, Cao Hongtao, Yu Ke
Division of Functional Materials and Nano Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences , Ningbo 315201, People's Republic of China.
ACS Appl Mater Interfaces. 2014 Jul 23;6(14):11550-7. doi: 10.1021/am502254s. Epub 2014 Jul 1.
In this article, we demonstrate that the Al-alloyed Ag nanoparticle-embedded alumina nanocermet films lead to excellent thermal stability, even at 500 °C for 130 h under an ambient nitrogen atmosphere. The outward diffusion of Al atoms from the AgAl bimetallic alloy nanoparticles and their easy oxidation create an armor layer to suppress the mobility of Ag atoms. Then, the AlAg particles or/and agglomerates with a uniform spherical shape favor higher dispersion concentration within the host matrix, which is beneficial both for high absorptance in the visible range and for the solid localized surface plasmon absorption features in the AgAl-Al2O3 nanocermet films. Based on the AgAl-Al2O3 absorbing layer with sound optical and microstructural stability, we successfully constructed a high-temperature-endurable solar selective absorber. The multilayer stacked absorber demonstrates a high solar absorptance of ∼94.2% and a low thermal emittance of ∼15% (@ 673 K) after annealing at 450 °C for 70 h in an ambient nitrogen atmosphere.
在本文中，我们证明了嵌入铝合金银纳米颗粒的氧化铝纳米金属陶瓷薄膜具有出色的热稳定性，即使在氮气环境气氛下500℃ 持续130小时的条件下也是如此。银铝双金属合金纳米颗粒中铝原子的向外扩散及其易于氧化形成了一个阻挡层，抑制了银原子的迁移。然后，具有均匀球形形状的铝银颗粒或/和团聚体有利于在主体基质中具有更高的分散浓度，这对于在可见光范围内的高吸收率以及银铝-氧化铝纳米金属陶瓷薄膜中的固体局域表面等离子体吸收特性均有益。基于具有良好光学和微观结构稳定性的银铝-氧化铝吸收层，我们成功构建了一种耐高温的太阳能选择性吸收器。在氮气环境气氛中于450℃ 退火70小时后，多层堆叠吸收器表现出约94.2% 的高太阳能吸收率和约15%（@ 673 K）的低热发射率。
