Raman Spectroscopy of Lattice-Matched Graphene on Strongly Interacting Metal Surfaces.
Raman Spectroscopy of Lattice-Matched Graphene on Strongly Interacting Metal Surfaces.
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DOI：
10.1021/acsnano.7b02686
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发表时间：
2017-05
期刊：
影响因子：
17.1
通讯作者：
D. Usachov;V. Davydov;V. Levitskii;V. O. Shevelev;D. Marchenko;B. Senkovskiy;O. Vilkov;A. Rybkin;L. Yashina;E. Chulkov;I. Sklyadneva;R. Heid;K. Bohnen;C. Laubschat;D. Vyalikh
中科院分区：
文献类型：
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作者：
D. Usachov;V. Davydov;V. Levitskii;V. O. Shevelev;D. Marchenko;B. Senkovskiy;O. Vilkov;A. Rybkin;L. Yashina;E. Chulkov;I. Sklyadneva;R. Heid;K. Bohnen;C. Laubschat;D. Vyalikh
尽管人们普遍认为当单层石墨烯与金属表面牢固结合时没有拉曼信号，但我们给出了Ni（111）和Co（0001）衬底上石墨烯单层的拉曼光谱。碳与这些表面的高结合能允许形成晶格匹配（1 × 1）结构，其中石墨烯被显著拉伸。这反映在相对于独立石墨烯的情况，拉曼G带的破纪录位移超过100 cm-1。使用电子衍射和光电子能谱，我们探索了上述系统连同多晶石墨烯在钴和分析可能的嵌入氧在环境条件下。得到的结果完全支持拉曼光谱。对独立石墨烯和拉伸石墨烯在强相互作用Co表面上的声子色散进行了理论研究，解释了拉曼光谱的主要特征。我们的研究结果为拉曼光谱在化学吸附石墨烯和相关材料的诊断中的应用创造了一个可靠的平台。
Regardless of the widely accepted opinion that there is no Raman signal from single-layer graphene when it is strongly bonded to a metal surface, we present Raman spectra of a graphene monolayer on Ni(111) and Co(0001) substrates. The high binding energy of carbon to these surfaces allows formation of lattice-matched (1 × 1) structures where graphene is significantly stretched. This is reflected in a record-breaking shift of the Raman G band by more than 100 cm-1 relative to the case of freestanding graphene. Using electron diffraction and photoemission spectroscopy, we explore the aforementioned systems together with polycrystalline graphene on Co and analyze possible intercalation of oxygen at ambient conditions. The results obtained are fully supported by Raman spectroscopy. Performing a theoretical investigation of the phonon dispersions of freestanding graphene and stretched graphene on the strongly interacting Co surface, we explain the main features of the Raman spectra. Our results create a reliable platform for application of Raman spectroscopy in diagnostics of chemisorbed graphene and related materials.