3. Mean Size by Number, Z-Average Hydrodynamic Diameter, Polydispersity Index (PDI) and Zeta Potentials of Dispersions of the Composite Materials and Their Individual Components in Deionized Water at Room Temperature, as Obtained by Dynamic/electrophoretic Light Scattering.

Sample	Mean size by number/nm	Z-average/nm	PDI	Zeta potential/mV
Mo 6	19 ± 6	153	0.23	–24 ± 17 (−7 ± 16)
CeO 2	105 ± 43	157	0.21	+30 ± 7 (14 ± 15)
Mo 6 @CeO 2	136 ± 56	200	0.18	+29 ± 5 (13 ± 17)

^ameasured in methanol.