In this research, nanoparticles have been synthesized by putting together a top-down sputtering technique to create atoms/clusters and a liquid medium in the vacuum chamber to capture and manipulate the subsequent particle formation and growth. The generated metal atoms/clusters from the bulk metal targets can collide and grow to form metal and metal alloy nanoparticles during travelling from the gas to the liquid phase, where they can be trapped and stabilized. The design provides a wide range control of the synthesis parameters such as sputtering head-type, sputtering current, the temperature, composition, and stirring rate of the liquid, etc. for tailoring the size, composition, structure, functionality, and stability of the resulting nanoparticles in the liquid matrix. Our study has demonstrated that particle size can be increased with increasing the sputtering current. In addition, the liquids and their functionalities can also be chosen not only to control the particle size but also to stabilize the formed nanoparticles. Furthermore, co-sputtering of two metal targets allows us to create solid solution nanoparticles of various metal pairs such as Au/Ag, Au/Cu, and Au/Pt, etc. The particle composition can be finely tuned via varying the sputtering currents applied on each target. This, in turn, offers a feasible tool for modifying the optical properties of the alloy nanoparticles. On the other hand, we also study the impact of sputtering parameters on particle size and compositions to shed light on the particle formation and growth. Details of the synthesis, characterization, and formation of metal and alloy nanoparticles with controllable composition, size, and colloidal stability will be addressed in the presentation.<br/>

Green synthesis and formation of metal and alloy nanoparticles dispersed in liquid by magnetron sputtering

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.