Gregory White II and Christopher L. Kitchens. Clemson University, Clemson, SC
As technology trends continue to shrink devices, research in metallic nanostructures and their synthesis from a “bottom-up” approach is becoming increasingly important. Metallic nanoparticles provide promise in this field because of their distinctive optical and electrical properties; these properties are a function of their size, shape, and composition. An important factor in controlling both the size and shape of metallic nanoparticles is their interaction with stabilizing capping ligands. By altering the solvent properties, these interactions are directly affected and can be noted by their dispersibility in solution. This presentation details how tuning the solvent properties of aqueous solutions of capping ligands can affect nanoparticle dispersibility in solution. A range of simple alcohols (methanol, ethanol, n-propanol) was used to decrease the polarity of the aqueous solutions of capping ligands used for nanoparticle synthesis. These solutions varied in concentration of alcohol by volume. It was noted that increasing the alcohol concentration and carbon number decreased the dispersibility of the silver nanoparticles in an aqueous media, and allowed for greater ease of exchange into an organic solvent. After synthesis, a ligand exchange was performed to allow for silver nanoparticles to be dispersed in hexane, substituting the aqueous phase capping agent with dodecanethiol. UV-VIS data and TEM imaging was used to characterize the shape and sizes of the resulting nanoparticles.