Symmetric and asymmetric colloidal clusters by colloidal fusion
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Synthesizing the high yield of tetrahedral clusters with the sub-micrometer size is important for the application of assembling photonic structures. However, there are limitations to making sufficiently high yields of tetrahedral clusters with sub-micron. Using core diffusion and charge interaction, we synthesized high yields of sub-micrometer tetrahedral clusters. Using charge interaction, the electrostatic attraction acts as a driving force in the coordination of the cluster. We diversified the cluster’s geometry by controlling the ratio of particle size. And adjusting the amounts of ions in the coordination system can change the charge density of each particle, so the yield of the tetrahedral cluster can be controlled. Using the core diffusion, we can also introduce the hybrid clusters that can be separated to get a high yield of tetrahedral clusters by a higher density of inorganic particles in the core particles. These findings give the method to make smaller and high-yield clusters.