The development of water purification device using solar energy has received tremendous attention. Despite extensive progress, traditional photothermal conversion usually has a high cost and high environmental impact. To overcome this problem, we develop a low cost, durable and environmentally friendly solar evaporator. This bi-layered evaporator is constructed with a thermal insulating polyvinylidene fluoride (PVDF) membrane as a bottom supporting layer and plasmonic silver nanoparticles decorated micro-sized hybrid flower (Ag/MF) as a top light-to-heat conversion layer. Compared with the sample with a flat silver film, the two-tier Ag/MF has a plasmonic enrichment property and high efficiency in converting the solar light to heat as each flower can generate a microscale hotspot by enriching the absorbed solar light. On the other hand, the PVDF membrane on the bottom with porous structure not only improves the mechanical stability of the entire structure, but also maintains a stable water supply from the bulk water to the evaporation interface by capillarity and minimizes the thermal conduction. The combination of excellent water evaporation ability, simple operation, and low cost of the production process imparts this type of plasmonic enhanced solar-driven interfacial water evaporator with promising prospects for potable water purification for point-of-use applications.

利用太阳能的净水装置的开发受到极大的关注。尽管取得了长足的进步，但是传统的光热转化通常具有高成本和高环境影响。为了克服这个问题，我们开发了一种低成本，耐用且环保的太阳能蒸发器。该双层蒸发器由隔热的聚偏二氟乙烯（PVDF）膜作为底部支撑层，且等离激元银纳米颗粒装饰的微尺寸杂花（Ag / MF）作为顶部的光热转换层构造而成。与具有平坦银膜的样品相比，两层Ag / MF具有等离激元富集特性，并且在将太阳光转换为热量方面具有很高的效率，因为每朵花都可以通过吸收吸收的太阳光而产生微米级的热点。另一方面，底部具有多孔结构的PVDF膜不仅提高了整个结构的机械稳定性，而且还通过毛细管作用保持了从大量水到蒸发界面的稳定供水，并最大限度地减少了热传导。出色的水蒸发能力，简单的操作和低成本的生产工艺相结合，使这种等离激元增强型太阳能驱动的界面水蒸发器在使用点应用的饮用水净化方面具有广阔的前景。