He/Ar-atom scattering from molecular monolayers: C60/Pt(111) and graphene/Pt(111)
He/Ar-atom scattering from molecular monolayers: C60/Pt(111) and graphene/Pt(111)
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DOI：
10.1088/0953-8984/22/30/304010
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Yoichi Yamada;C. Sugawara;Y. Satake;Y. Yokoyama;R. Okada;T. Nakayama;Masahiro Sasaki;Takahiro Kondo;Junepyo Oh;Junji Nakamura;W. Hayes
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文献类型：
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作者：
Yoichi Yamada;C. Sugawara;Y. Satake;Y. Yokoyama;R. Okada;T. Nakayama;Masahiro Sasaki;Takahiro Kondo;Junepyo Oh;Junji Nakamura;W. Hayes
演示了吸附在 Pt(111) 表面上的 C60 和石墨烯单层的超音速 He 和 Ar 原子束散射，以便详细了解迄今为止尚未详细研究的气体分子碰撞。基于硬立方模型和最近发展的光滑表面模型等经典模型，讨论了不同射弹所看到的单层的有效质量和声子谱密度。推导出两个单层都具有较大的有效质量，表明单次碰撞事件中表面原子的集体效应。石墨烯的有效德拜温度被发现与高取向热解石墨（HOPG）中报道的相似，表明石墨烯与 Pt 基底很好地解耦。我们发现 C60 层的德拜-沃勒因子要小得多，这可能反映了 C60-Pt(111) 的强相互作用。
Supersonic He and Ar atomic beam scattering from C60 and graphene monolayers adsorbed on a Pt(111) surface are demonstrated in order to obtain detailed insight into a gas–molecule collision that has not been studied in detail so far. The effective masses and phonon spectral densities of the monolayers seen by different projectiles are discussed based on classical models such as the hard cube model and the recently developed smooth surface model. Large effective masses are deduced for both the monolayers, suggesting collective effects of surface atoms in the single collision event. The effective Debye temperature of graphene was found to be similar to that reported in highly oriented pyrolytic graphite (HOPG), indicating that the graphene is decoupled well from the Pt substrate. A much smaller Debye–Waller factor was found for the C60 layer, probably reflecting the strong C60–Pt(111) interaction.