| AVS 61st International Symposium & Exhibition | |
| Electronic Materials and Processing | Monday Sessions |
| Session EM-MoA |
| Session: | Nanoparticles for Electronic Materials |
| Presenter: | Grant Johnson, Pacific Northwest National Laboratory |
| Authors: | G. Johnson, Pacific Northwest National Laboratory R.J. Colby, Pacific Northwest National Laboratory M.H. Engelhard, Pacific Northwest National Laboratory D. Du, Pacific Northwest National Laboratory Y. Lin, Pacific Northwest National Laboratory J. Laskin, Pacific Northwest National Laboratory |
| Correspondent: | Click to Email |
Soft landing of mass-selected ions onto surfaces is a powerful approach for the highly controlled preparation of materials that are often unobtainable using conventional synthesis techniques. A non-thermal physical synthesis method, DC magnetron sputtering combined with inert gas-aggregation, has been employed to produce anionic metal nanoparticles in the gas-phase across a range of sizes, shapes and elemental compositions for controlled deposition onto conductive electrode surfaces. Simultaneous sputtering of multiple metal targets employing up to three independent DC magnetrons in the same gas aggregation region is demonstrated to produce complex binary alloy nanoparticles with well-defined elemental composition and morphology. Size-selection of the anionic nanoparticles employing a quadrupole mass-filter prior to soft landing is shown to provide effective control over the size of nanoparticles delivered to surfaces. A suite of cutting edge analytical techniques including atomic force microscopy, scanning and transmission electron microscopy, x-ray photoelectron spectroscopy and medium energy ion scattering is utilized to demonstrate how the size, shape, elemental composition and surface density of soft landed nanoparticles may be tuned to promote the efficient electrocatalytic reduction of oxygen.