For Characterization of particles, you can calculate the no. of atoms in each particles and also check the structural changes via Raman and XRD by changing synthesis parameters.
We restore gold in the form of nanoparticles on coal and carbon micronitises. The minimum size of nanoparticles that are localized in the mineral form is 30-50 nanometers. Individual individuals form spherical, pseudocrystalline forms.