Electron-stimulated purification of platinum nanostructures grown via focused electron beam induced deposition

Platinum-carbon nanostructures deposited via electron beam induced deposition from MeCpPt(IV)Me₃ are purified during a postdeposition electron exposure treatment in a localized oxygen ambient at room temperature. Time-dependent studies demonstratethat the process occurs from the top-down. Electron beam energy and current studies demonstrate that the process is controlled by a confluence of the electron energy loss and oxygen concentration. Furthermore, the experimental results are modeled as a 2nd order reaction which is dependent on both the electron energy loss density and the oxygen concentration. In addition to purification, the post-deposition electron stimulated oxygen purification process enhances the resolution of the EBID process due to the isotropic carbon removal from the as-deposited materials which produces high-fidelity shape retention.