Self-assembly of highly efficient, broadband plasmonic absorbers for solar steam generation.
Self-assembly of highly efficient, broadband plasmonic absorbers for solar steam generation.
复制标题
高效，宽带等离子体吸收器的自组装，用于太阳蒸汽的产生。
DOI：
10.1126/sciadv.1501227
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发表时间：
2016-04
期刊：
影响因子：
13.6
通讯作者：
Zhu J
中科院分区：
文献类型：
--
作者：
Zhou L;Tan Y;Ji D;Zhu B;Zhang P;Xu J;Gan Q;Yu Z;Zhu J
一种自组装等离子体吸收体在宽波长范围内有效吸收光，可用于纳米光子器件。理想吸收体的研究，能够有效地吸收光在广泛的波长范围内，是至关重要的，以及许多应用从太阳能蒸汽产生和热光伏光/热探测器的关键。由于等离子体学的最新进展，等离子体吸收体引起了人们的广泛关注。然而，这些吸收剂的性能和可扩展性，主要是由自上而下的方法制造的，需要进一步改进，以实现广泛的应用。我们报道了一种等离子体吸收剂，它可以在400 nm到10 μm的波长范围内实现~99%的平均吸光度，这是迄今为止报道的最有效的宽带等离子体吸收剂。吸收剂是通过一步沉积工艺将金属纳米颗粒自组装到纳米孔模板上制成的。由于其高效的光吸收、强场增强和多孔结构，不仅可以有效地吸收太阳能，还可以显著地局部加热和连续流，因此基于等离子体吸收器的太阳能蒸汽发电在仅4太阳强度（4 kW m - 2）的太阳照射下效率超过90%。明显的光吸收效应与高通量自组装工艺相结合，可能导致其他纳米光子结构和器件的大规模制造。
A self-assembling plasmonic absorber absorbs light efficiently across a wide range of wavelengths and could be used in nanophotonic devices. The study of ideal absorbers, which can efficiently absorb light over a broad range of wavelengths, is of fundamental importance, as well as critical for many applications from solar steam generation and thermophotovoltaics to light/thermal detectors. As a result of recent advances in plasmonics, plasmonic absorbers have attracted a lot of attention. However, the performance and scalability of these absorbers, predominantly fabricated by the top-down approach, need to be further improved to enable widespread applications. We report a plasmonic absorber which can enable an average measured absorbance of ~99% across the wavelengths from 400 nm to 10 μm, the most efficient and broadband plasmonic absorber reported to date. The absorber is fabricated through self-assembly of metallic nanoparticles onto a nanoporous template by a one-step deposition process. Because of its efficient light absorption, strong field enhancement, and porous structures, which together enable not only efficient solar absorption but also significant local heating and continuous stream flow, plasmonic absorber–based solar steam generation has over 90% efficiency under solar irradiation of only 4-sun intensity (4 kW m−2). The pronounced light absorption effect coupled with the high-throughput self-assembly process could lead toward large-scale manufacturing of other nanophotonic structures and devices.