Atomic structure and electronic properties of the intercalated Pb atoms underneath a graphene layer
Autor: | Fei Ma, Yan Li, Tingwei Hu, Haitao Gao, Ke-Wei Xu, Xiangtai Liu, Qianfeng Xia, Dong Yang |
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Rok vydání: | 2021 |
Předmět: |
Materials science
Graphene Intercalation (chemistry) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Crystal Crystallography Zigzag law General Materials Science Density functional theory Scanning tunneling microscope 0210 nano-technology Spectroscopy Layer (electronics) |
Zdroj: | Carbon. 179:151-158 |
ISSN: | 0008-6223 |
Popis: | Determining atomic structure of intercalated metallic layer under graphene is a hot-topic due to the potential applications in electronic engineering. In this study, Pb-intercalated graphene (PbG) is fabricated on SiC substrate and the atomic structure and electronic properties of the intercalated Pb atoms underneath graphene are investigated by scanning tunneling microscopy/spectroscopy (STM/STS). As the crystal facet of intercalated Pb atoms can be arranged in (111) (unit cell, 0.35 nm × 0.35 nm) and (110) (unit cell, 0.61 nm × 0.35 nm), mottled moire pattern (period, 2.5 nm) and striated moire pattern (period, 2.1 nm) are formed. Atomic arrangement of the intercalated Pb is sensitive to tip scanning resulting in the conversion of the two moire patterns. Nevertheless, the crystal orientation of moire patterns is always aligned with zigzag direction of graphene. As revealed by STS, PbG performs the similar electronic states to those of free-standing graphene due to the shielding effects of Pb intercalation. The crystallographic relationship between graphene and Pb atoms is also confirmed by density functional theory (DFT) calculations. The study provides crucial for understanding the structure of intercalated Pb atoms underneath a graphene layer, which may enable the development of new 2D materials capped by graphene. |
Databáze: | OpenAIRE |
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