Abstract
Platinum nanoparticles were deposited on a highly oriented pyrolytic graphite (HOPG) substrate using a coaxial arc plasma gun. The Pt-deposited HOPG substrate was cross-sectioned to prepare a thin foil specimen using focused ion beam milling, and was analyzed by using high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, and electron energy loss spectroscopy. The surface of the HOPG substrate was observed to be disordered by the Pt ion irradiation. The surface was located using the depth profiles of π + σ plasmon peaks and the full width at half maximum of π⁎ peaks. The denaturation of the HOPG substrate by the Pt ion irradiation was observed to a depth of approximately 12 nm.
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