Controlled Growth Cu₂S Nanoarrays with High-Performance Photothermal Properties

The controlled growth of Cu₂S nanoarrays was constructed by a facile two-step impregnation synthesis route. The as-synthesized Cu₂S/CuO@Cu samples were precisely characterized in terms of surface morphology, phase, composition, and oxidation states. At the laser irradiation of 808 nm, Cu₂S/CuO@Cu heated up to 106 °C from room temperature in 120 s, resulting in an excellent photothermal conversion performance. The Cu₂S/CuO@Cu exhibited excellent cycling performance-sustaining the photothermal performance during five heating-cooling cycles. The finite difference time domain (FDTD) simulation of optical absorption and electric field distributions assured the accuracy and reliability of the developed experimental conditions for acquiring the best photothermal performance of Cu₂S/CuO@Cu.