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美国卫生研究院文献>Nature Communications
>Flexible thin-film black gold membranes with ultrabroadband plasmonic nanofocusing for efficient solar vapour generation
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Flexible thin-film black gold membranes with ultrabroadband plasmonic nanofocusing for efficient solar vapour generation
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.
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机译：通过用金属纳米壳或纳米颗粒进行表面等离子体激元加热来实现太阳能蒸汽的产生，金属纳米壳或纳米颗粒固有地具有窄的吸收带宽。为了从更广的太阳光谱有效地进行光热转换，我们采用了绝热等离子体纳米聚焦技术，以实现偏振无关的超宽带光吸收和高等离激元耗散损耗。在这里，我们展示了大面积的柔性薄膜黑金膜，该膜具有多尺度结构，这些结构具有变化的金属纳米尺度间隙（0-200–nm）以及微尺度漏斗结构。自聚集的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，而微尺度漏斗结构在2.5–17μm处产生7％的平均反射。该膜允许热定位在几微米厚的层内，并通过微孔连续供水。在20 kW m −2 时，我们可以高效地产生水蒸气，太阳能热转换效率高达57％。这种新结构在太阳能收集，热等离子体技术和相关技术中具有多种应用。
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