XPS and STM study of carbon deposits at the surface of platinum (110) |
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Authors: | RI Kvon AI Boronin Sh K Shaikhutdinov RA Buyanov |
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Institution: | Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russia |
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Abstract: | The deposition of carbon due to high temperature ethylene decomposition at Pt(110) was studied by XPS and STM techniques. In the temperature range 700–1400 K no graphite species were observed. Instead, two carbon states were distinguished by XPS. At temperatures 700–850 K chemisorbed carbon layer is formed with BE(C1s) = 284.2 eV, this carbon state reacting readily with both oxygen and hydrogen. At T> 850 K carbon layer with BE(C1s) = 284.6–284.9 eV is formed. Further study showed this carbon species to be stable up to 1150 K and to be inert towards both hydrogen and oxygen up to 1000 K. This state was attributed to diamond-like carbon (DLC). STM study of DLC on Pt(110) revealed the patched pseudo-C-(3 × 1) structure. This reconstruction is believed to account for the DLC formation at platinum (110) surface. |
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Keywords: | XPS Carbon Platinum |
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