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Morphology, Stability, Structure, and CO2–Surface Chemistry of Micelle Nanolithographically Prepared Two-Dimensional Arrays of Core–Shell Fe–Pd Multicomponent Nanoparticles

We have employed micelle nanolithography technique to achieve two-dimensional (2D) arrays of Fe–Pd multicomponent core–shell nanoparticles (NPs) in a quasi-hexagonal lattice. X-ray photoelectron spectroscopy and synchrotron-based X-ray absorption spectroscopy together confirm that high temperature annealing (∼900 K) renders core–shell architecture in which metallic Pd phase adopts the core and Fe–Pd mixed oxide phase adopts the shell. The mixed Fe–Pd oxide shell closely resembles a Pd-doped α-Fe2O3 structure. Finally, temperature-programmed desorption measurement explores the surface chemistry of carbon dioxide (CO2) on the Fe–Pd multicomponent nanoparticle surfaces. This surface chemistry has been explored on atomically clean Fe–Pd multicomponent NP surfaces under the ultrahigh vacuum conditions. Cleanliness of the NP surfaces is confirmed with the help of auger electron spectroscopy. We find that Fe–Pd multicomponent core–shell nanoparticles capture CO2 at the room temperature; however, on the contrary,...