By exploiting the amorphous-crystalline transition of CuS, which results in greatly increased absorption throughout the entire near-infrared region, a novel smart off-on CuS photoacoustic imaging agent with good photostability and low cost is developed. More importantly, the photoacoustic imaging ability of CuS can be effectively activated by body temperature for in vivo cancer imaging.

Near-infrared light driven devices for water evaporation are strictly limited by their inflexibility, high cost, complicated fabrication processes, and low energy-conversion efficiency. Here, a flexible copper sulfide composite membrane with...