Interaction of individual Ag atoms with graphene on Rh(111): Adsorption, migration, and cluster formation
Interaction of individual Ag atoms with graphene on Rh(111): Adsorption, migration, and cluster formation
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DOI：
10.1016/j.carbon.2023.118032
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发表时间：
2023-04
期刊：
影响因子：
10.9
通讯作者：
H. Okuyama;D. Yamamoto;S. Hatta;T. Aruga
中科院分区：
文献类型：
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作者：
H. Okuyama;D. Yamamoto;S. Hatta;T. Aruga
用扫描隧道显微镜研究了Ag原子与Rh（111）表面石墨烯云纹的相互作用。吸附在15 K时，银原子主要存在于特定位点的摩尔单位电池中的单体，因为热扩散受到抑制。Ag原子在费米能级以上约0.5V处出现dI/dV峰，归属于Ag（5s）-C（2 pz）反键态。在高温下，Ag吸附原子被热激活扩散并形成团簇，其中激活势垒取决于莫尔周期性。此外，迁移是由注入隧穿电子到反键态。这项工作提供了原子尺度上的金属吸附原子的金属支撑的石墨烯上的聚集过程的洞察力。
The interaction of Ag atoms with graphene moiré on Rh (111) was studied by scanning tunneling microscopy. Upon adsorption at 15 K, the Ag atoms existed mainly as monomers at specific sites in the moiré unit cell because thermal diffusion was suppressed. The Ag atoms exhibited a d I/d V peak at∼ 0.5 V above the Fermi level, which was assigned to Ag (5s)-C (2p z) anti-bonding state. At elevated temperature, the Ag adatoms were thermally activated to diffuse and form clusters, wherein the activation barrier depended on the moiré periodicity. Furthermore, migration was induced by injecting tunneling electrons into the anti-bonding state. This work provides atomic-scale insight into the aggregation process of metal adatoms on metal-supported graphene.