Strongly Interacting C60/Ir(111) Interface: Transformation of C60 into Graphene and Influence of Graphene Interlayer

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• 作者：Xiangmin Fei ; Xu Zhang ; Vanessa Lopez ; Gang Lu ; Hong-Jun Gao ; Li Gao
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 10, 2015
• 年：2015
• 卷：119
• 期：49
• 页码：27550-27555
• 全文大小：414K
• ISSN：1932-7455

文摘

The adsorption, electronic structure, and thermodynamics of C₆₀ molecules on Ir(111) and graphene/Ir(111) surfaces have been investigated by combining scanning tunneling microscopy and spectroscopy as well as density functional theory calculations. C₆₀ is found to interact strongly with the Ir surface, leading to a spontaneous formation of graphene on the Ir surface at elevated temperatures. The introduction of a graphene interlayer at the C₆₀/Ir(111) interface dramatically affects the interface properties, including the formation of larger molecular islands, improvement in ordering of molecular arrangements, suppression of charge transfer between C₆₀ and Ir, and thermal desorption of C₆₀ from the surface without decomposition or polymerization. We also find that C₆₀ is an effective solid precursor for preparing small-sized graphene quantum dots as well as graphene layers on the Ir surface.