High-density electrosorbed carbon monoxide monolayers on Pt(111) under atmospheric pressureстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 26 июня 2024 г.
Аннотация:We report structure studies of high-density CO monolayers on Pt(111) surfaces in equilibrium with gaseous CO near atmospheric pressure, using surface x-ray scattering (SXS) and scanning tunneling microscopy (STM). We were able to stabilize extremely well-ordered CO monolayers by emersion transfer from an electrochemical cell. We found the hexagonal close-packed (2×2)−3CO structure at room temperature in ∼1atm CO gas pressure. We also confirm the (√19×√19)−13CO structure previously proposed in STM studies [Vestergaard et al., Phys. Rev. Lett. 88, 259601 (2002)]. Based on SXS and STM measurements, a tentative phase diagram is proposed. Detailed SXS structure studies of the (2×2)−3CO structure suggest a surface structure and substrate reconstruction less symmetric than previously studies suggested. We also find that (√19×√19)−13CO structure induces substrate reconstructions including the dimerization of Pt bonded to bridging CO and the rotation of the Pt cluster with atop CO.