Fabrication of screen-printed cuprous bromide (CuBr) thick films for highly sensitive and selective ammonia (NH ₃ ) detection

Abstract Achieving both high production efficiency and excellent sensing properties is crucial for industrial research and development on gas sensors. In this study, we successfully fabricated cuprous bromide (CuBr) thick-film sensors for ammonia (NH 3 ) detection using screen-printing. Hundreds of CuBr thick films were deposited in a single screen-printing step, demonstrating the high production efficiency of this method. The resulting CuBr sensors exhibited a clear response to NH 3 concentrations as low as 50 parts per billion while showing no cross-sensitivity to very high concentrations of ethanol. These results demonstrate the great potential of the screen-printed CuBr films for next-generation commercial NH 3 sensors.