Journal
ADVANCED MATERIALS
Volume 31, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901017
Keywords
2D honeycomb sheets; alloy surfaces; bubble structure; plumbene; post-graphene materials
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Funding
- Nagoya University Synchrotron Radiation Research Center [2018001]
- Toyoaki Scholarship Foundation
- Nagoya University
- Japan Society for the Promotion of Science (JSPS)
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While theoretical studies predicted the stability and exotic properties of plumbene, the last group-14 cousin of graphene, its realization has remained a challenging quest. Here, it is shown with compelling evidence that plumbene is epitaxially grown by segregation on a Pd1-xPbx(111) alloy surface. In scanning tunneling microscopy (STM), it exhibits a unique surface morphology resembling the famous Weaire-Phelan bubble structure of the Olympic WaterCube in Beijing. The soap bubbles of this Nano WaterCube are adjustable with their average sizes (in-between 15 and 80 nm) related to the Pb concentration (x < 0.2) dependence of the lattice parameter of the Pd1-xPbx(111) alloy surface. Angle-resolved core-level measurements demonstrate that a lead sheet overlays the Pd1-xPbx(111) alloy. Atomic-scale STM images of this Pb sheet show a planar honeycomb structure with a unit cell ranging from 0.48 to 0.49 nm corresponding to that of the standalone 2D topological insulator plumbene.
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