Laser-Induced transfer of TiO2 micro/nanostructures onto polymer surfaces for enhanced water harvesting and Photocatalysis

Abstract

Atmospheric water harvesting (AWH) offers a promising solution for decentralized freshwater supply, but its practical application is hindered by low collection efficiency in contaminated environments and the lack of eco-friendly fabrication methods. Here, we present a novel strategy using laser-induced backward transfer technology to fabricate a multifunctional water collection film. By depositing a linear array of TiO 2 micro/nanostructures onto a lubricant-infused polydimethylsiloxane (PDMS) surface, we achieve synergistic integration of efficient water capture, directional transport, and antifouling properties. The optimized hybrid surface exhibits enhanced water harvesting, achieving a collection rate 153.1% that of the plain PDMS film. Moreover, the intrinsic photocatalytic activity of TiO 2 confers a robust capacity for the photodegradation of organic pollutants under light irradiation. The mechanical adhesion of TiO 2 to the film ensures its long-term operational stability. This environmentally benign and efficient fabrication method overcomes the limitations of traditional chemical processes, offering a robust solution for next-generation AWH systems that combine high-efficiency collection with in-situ purification.