Optimizing the synergistic effect of CuWO4/CuS hybrid composites for photocatalytic inactivation of pathogenic bacteria Xiuli Dong, Rowan Rebecca Katzbaer, Basant Chitara, Li Han, Liju Yang, Raymond E. Schaak and Fei Yan Abstract Herein, we report an effective strategy to maximize the antimicrobial activity of CuWO4/CuS hybrid composites, prepared by simply mixing CuWO4 and CuS nanopowders with varying weight ratios in phosphate buffered saline solution by ultrasound.