The collection of available water resources from fog has caused widespread attention under the situation of water shortage.However, their practical deployment has been largely retarded because most microstructures have very weak air-binding ability and cannot catch droplets on a large scale.The key to fog harvesting is the process in which the fog quickly gathers into small droplets and the droplets roll off quickly.Hence, inspired by the structure of sisal, we designed and synthesized ZnO nanoneedle multistage structure on Cu mesh by two-step method of electric-field assisted growth. ZnO nanoneedle multistage structure is composed of countless gradient structures, and the tip of the gradient can easily capture small droplets, which enables faster droplet condensation. The results demonstrate that ZnO nanoneedle multistage structure has ultra-low adhesion due to high roughness and strong ability to confine air. Compared with other ZnO nanostructures, this design of the structure can promote the falling of water droplets and maintain the Cassie state model during fog harvesting, improving fog collection efficiency. The current design provides a promising method to multi-level structure into fog collectors, which offers a great opportunity to develop water harvesters for real-world applications.

在缺水的情况下，从雾中收集可利用的水资源引起了广泛的关注，但是由于大多数微结构的空气吸附能力很弱并且无法大规模捕获液滴，因此它们的实际应用受到了很大的阻碍。雾气收集是雾气迅速聚集成小液滴且液滴迅速滚落的过程。因此，在剑麻结构的启发下，我们通过电场的两步法设计合成了ZnO纳米针多级结构。协助成长。ZnO纳米针多级结构由无数的梯度结构组成，并且梯度的尖端可以轻松捕获小液滴，从而加快了液滴的凝结。结果表明，ZnO纳米针多级结构由于具有较高的粗糙度和较强的封闭空气能力而具有超低的附着力。与其他ZnO纳米结构相比，这种结构设计可以促进水滴的下落，并在雾气收集过程中保持Cassie状态模型，从而提高了雾气收集效率。当前的设计提供了一种将多层次结构集成到雾收集器中的有希望的方法，这为开发用于实际应用的集水器提供了绝佳的机会。