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Structure of squaraine 20 (left) and cell viability assay with zinc oxide nanoparticles, free squaraine dye 20, and zinc oxide–squaraine nanohybrids showing the improved performance of the hybrid relative to the two constituents (right). Black and red bars are dark and light toxicity at 0.5 μM concentration, and blue and green bars are dark and light toxicity at 1 μM concentration. Figure adapted with permission from ref 81. Copyright 2019 Elsevier.
