Fig. 1

A SEM image displaying the size and morphology of the ZnO-NPs and photographic of particle suspension in PBS within 5 min after preparation. B Particle size and zeta potential of the HSA/ZnO NPs. C Cytotoxic effects of HSA/ZnO NPs on HeLa cells. Significant differences are indicated by *p < 0.0001 compared with the control group