Abstract
Charged Pt–Ir alloy nanoparticles are generated through femtosecond laser ablation of aPt9Ir target in acetone without using chemical precursors or stabilizing agents. Preservation ofthe target’s stoichiometry in the colloidal nanoparticles is confirmed by transmissionelectron microscopy (TEM)–energy-dispersive x-ray spectroscopy (EDX), highangle annular dark field (HAADF) scanning transmission electron microscopy(STEM)–EDX elemental maps, high resolution TEM and selected area electrondiffraction (SAED) measurements. Results are discussed with reference tothermophysical properties and the phase diagram. The nanoparticles show a lognormalsize distribution with a mean Feret particle size of 26 nm. The zeta potential of − 45 mV indicates high stability of the colloid with a hydrodynamic diameter of 63 nm. Thecharge of the particles enables electrophoretic deposition of nanoparticles, creatingnanoscale roughness on three-dimensional PtIr neural electrodes within a minute. Incontrast to coating with Pt or Ir oxides, this method allows modification of the surfaceroughness without changing the chemical composition of PtIr.
Published Version
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