Flexible thin-film black gold membranes with ultrabroadband plasmonic nanofocusing for efficient solar vapour generation.
Flexible thin-film black gold membranes with ultrabroadband plasmonic nanofocusing for efficient solar vapour generation.
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DOI：
10.1038/ncomms10103
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发表时间：
2015-12-14
影响因子：
16.6
通讯作者：
Padilla WJ
中科院分区：
文献类型：
--
作者：
Bae K;Kang G;Cho SK;Park W;Kim K;Padilla WJ
太阳能蒸汽产生已经通过具有金属纳米壳或纳米颗粒的表面等离子体激元加热实现，其具有固有的窄吸收带宽。为了从更宽的太阳光谱进行有效的光热转换，我们采用绝热等离子体纳米聚焦来实现与偏振无关的超宽带光吸收和高等离子体耗散损耗。在这里，我们展示了大面积的柔性薄膜黑金膜，它具有不同的金属纳米级间隙（0-200 nm）以及微米级漏斗结构的多尺度结构。自聚集金属纳米线束阵列的绝热纳米聚焦在400- 2，500 nm处产生91%的平均吸收，并且微尺度漏斗结构在2.5-17 μm处产生7%的平均反射。这种膜允许在几微米厚的层内进行热定位，并通过微孔连续供水。在20 kW m−2时，我们的太阳能热转换效率高达57%，高效地产生水蒸气。这种新结构在太阳能收集、热等离子体激元和相关技术中具有各种应用。 在太阳辐射下的高效蒸汽生成对于能量收集应用是令人感兴趣的。在这里，Bae等人开发了一种由金属涂层氧化铝纳米线组成的等离子体纳米聚焦膜，以有效地产生太阳能蒸汽，在20 kWm−2时效率高达57%。
Solar steam generation has been achieved by surface plasmon heating with metallic nanoshells or nanoparticles, which have inherently narrow absorption bandwidth. For efficient light-to-heat conversion from a wider solar spectrum, we employ adiabatic plasmonic nanofocusing to attain both polarization-independent ultrabroadband light absorption and high plasmon dissipation loss. Here we demonstrate large area, flexible thin-film black gold membranes, which have multiscale structures of varying metallic nanoscale gaps (0–200 nm) as well as microscale funnel structures. The adiabatic nanofocusing of self-aggregated metallic nanowire bundle arrays produces average absorption of 91% at 400–2,500 nm and the microscale funnel structures lead to average reflection of 7% at 2.5–17 μm. This membrane allows heat localization within the few micrometre-thick layer and continuous water provision through micropores. We efficiently generate water vapour with solar thermal conversion efficiency up to 57% at 20 kW m−2. This new structure has a variety of applications in solar energy harvesting, thermoplasmonics and related technologies. Efficient steam generation under solar irradiation is of interest for energy harvesting applications. Here, Bae et al. develop a plasmonic nanofocusing film consisting of metal coated alumina nanowires to efficiently generate solar vapour with an efficiency up to 57% at 20 kWm−2.