Table 3.

Specification of ZnONPs according to Sigma-Aldrich Co

Characteristics	Structural color	Avg. particle size
ZnO	Milky white	≤40 nm (APS)
Concentration	Particle size	Density	pH
20 wt.% in H2O	< 100 nm	1.7 ± 0.1 g/mL at 25 °C	7.5 ± 1.5