Evidence of the interaction of evaporated Pt nanoparticles with variously treated surfaces of highly oriented pyrolytic graphite

Article Abstract:

The interactions of Pt nanoparticles, deposited by evaporation onto highly oriented pyrolytic graphite (HOPG) surfaces modified by kiloelectronvolt Ar(super +) beam treatment is studied by X-ray photoelectron spectroscopy core-level line shape analysis. Results indicate that Pt nanoparticles interact most extensively with the Ar(super +)-treated HOPG surface, and least extensively with the untreated HOPG surface.

Platinum compounds, Chemical properties, Evaporation

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Interaction of evaporated nickel nanoparticles with highly oriented pyrolytic graphite: Back-bonding to surface defects, as studied by X-ray photoelectron spectroscopy

Article Abstract:

Ni nanoparticle evaporation onto highly oriented graphite (HOPG), with low and high surface defect densities is studied. The variation of the C 1s peak intensity with Ni coverage suggest that the photoelectron emission yield may be enhanced at lower Ni coverages, due to Ni nanoparticle-induced electron localization and work function reduction at the HPOG surface, which is evidence of such back-bonding.

Usage, Photoelectron spectroscopy

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Molecular motion of a nickel-bis(dithiolato) complex in solution

Article Abstract:

The molecular motion of the planar bis(maleonitriledithiolate)nickel anion (Ni[(mnt).sub.2.sup.-]) is analyzed as a function of temperature by using electron spin resonance (ESR) in many polar solvents. The simulations and width analyses have shown that the paramagnetic species reorienting in solution has a shape that is similar to that of the Ni[(mnt).sub.2.sup.-] ion.

Observations, Spectra, Electron paramagnetic resonance, Solvents

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