Influence of Graphene on Charge Transfer between CoPc and Metals: The Role of Graphene–Substrate Coupling
Influence of Graphene on Charge Transfer between CoPc and Metals: The Role of Graphene–Substrate Coupling
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DOI：
10.1021/acs.jpcc.5b02912
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发表时间：
2015-06
影响因子：
3.7
通讯作者：
J. Uihlein;Małgorzata Polek;M. Glaser;H. Adler;R. Ovsyannikov;Maximilian Bauer;M. Ivanovic;A. Preobrajenski;A. Generalov;T. Chassé;H. Peisert
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文献类型：
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作者：
J. Uihlein;Małgorzata Polek;M. Glaser;H. Adler;R. Ovsyannikov;Maximilian Bauer;M. Ivanovic;A. Preobrajenski;A. Generalov;T. Chassé;H. Peisert
利用光激发电子能谱（XPS和UPS）和X射线吸收谱（XAS或NEXAFS）研究了酞菁钴（CoPc）在Pt（111）、石墨烯/Pt（111）和Au插层石墨烯/Ni（111）上的电子结构。对于Pt（111）上的CoPc，XPS和XAS谱的形状发生了显著的变化，表明CoPc中的Co离子与金属基体发生了电荷转移。通过插入石墨烯缓冲层可以完全防止CoPc和Pt（111）之间的强相互作用。对于石墨烯/Ni（111）上的CoPc，只有在Ni（111）上的石墨烯被金插层时才能阻止电荷转移。因此，石墨烯电子结构的干扰与底层衬底和相应的电荷掺杂的石墨烯的相互作用已被发现影响吸附的CoPc的电子性质相当大。
The electronic structure of cobalt phthalocyanine (CoPc) on Pt(111), graphene/Pt(111), and Au-intercalated graphene/Ni(111) is investigated by photoexcited electron spectroscopies: photoemission (XPS and UPS) and X-ray absorption spectroscopy (XAS or NEXAFS). For CoPc on Pt(111), significant changes of the shape of XPS and XAS spectra indicate a charge transfer from the metal substrate to the Co ion of CoPc. The strong interaction between CoPc and Pt(111) can be completely prevented by the insertion of a graphene buffer layer. For CoPc on graphene/Ni(111), the charge transfer is only prevented if the graphene on Ni(111) is intercalated by gold. Therefore, the disturbance of the graphene electronic structure by the interaction with underlying substrate and the corresponding charge doping of graphene has been found to affect the electronic properties of adsorbed CoPc considerably.