Cold plasma treatment for ligand removal from nanocrystals and evolution of surface coordination state
Source abstract
Abstract
Removal of the capping ligands on metal nanocrystals (NCs) is important for exploring structure–property correlations with supported NCs. Herein, we demonstrate a cold plasma treatment method to remove poly(N-vinyl-2-pyrrolidone) (PVP) on metal NCs. Fourier transform infrared spectroscopy of CO as a probe molecule (CO-FTIR) was used to probe the changes of surface coordination state on Pt NCs and octahedral Pt NCs. Compared with thermal calcination, plasma treatment can preserve the particle size and morphology of Pt NCs and octahedral Pt NCs. Thermal calcination drives some under-coordinated (UC) sites to develop into more stable well-coordinated (WC) sites because of atomic migration, but plasma treatment drives WC sites to develop into UC sites in contrast. The ionized atoms in plasma may bombardment the Pt surface to bring more coordination unsaturation of the surface. Graphical abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Catalytic Processes in Materials Science · nanoparticles nucleation surface interactions · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (19)
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