Effect of extraction solvent on removal of excess ligands in as-synthesized silver colloidal nanoparticles

Kritin Vongthongsri, Thailand 16-18

During nanoparticle synthesis, ligands—also often reducing agents—are usually added in excess so as to promote reaction kinetics. As a result, not all of them are adsorbed onto the particle interface; some remain free and not adsorbed in the solution. These free residuals can have adverse effects on subsequent processes such as shell growth and ligand exchange. Thus, the removal of free ligands is vital to the manufacturing of nanoparticles. In this experiment, as-synthesized silver nanoparticles were purified by solvent extraction.

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