Germanene termination of Ge2Pt crystals on Ge(110)

Pantelis Bampoulis, Lijie Zhang, A. Safaei, Raoul van Gastel, Bene Poelsema, Henricus J.W. Zandvliet

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Abstract

We have investigated the growth of Pt on Ge(1 1 0) using scanning tunneling microscopy and spectroscopy. The deposition of several monolayers of Pt on Ge(1 1 0) followed by annealing at 1100 K results in the formation of 3D metallic Pt-Ge nanocrystals. The outermost layer of these crystals exhibits a honeycomb structure. The honeycomb structure is composed of two hexagonal sub-lattices that are displaced vertically by 0.2 Å with respect to each other. The nearest-neighbor distance of the atoms in the honeycomb lattice is 2.5  ±  0.1 Å, i.e. very close to the predicted nearest-neighbor distance in germanene (2.4 Å). Scanning tunneling spectroscopy reveals that the atomic layer underneath the honeycomb layer is more metallic than the honeycomb layer itself. These observations are in line with a model recently proposed for metal di-(silicides/)germanides: a hexagonal crystal with metal layers separated by semiconductor layers with a honeycomb lattice. Based on our observations we propose that the outermost layer of the Ge2Pt nanocrystal is a germanene layer
Original languageEnglish
Article number442001
Pages (from-to)442001-
JournalJournal of physics: Condensed matter
Volume26
Issue number44
DOIs
Publication statusPublished - 2014

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Honeycomb structures
Nanocrystals
Metals
Spectroscopy
Silicides
Crystals
Scanning tunneling microscopy
Crystal lattices
crystals
Monolayers
Annealing
Semiconductor materials
Scanning
honeycomb structures
Atoms
nanocrystals
germanides
silicides
metals
spectroscopy

Keywords

  • IR-96579
  • METIS-311009

Cite this

Bampoulis, Pantelis ; Zhang, Lijie ; Safaei, A. ; van Gastel, Raoul ; Poelsema, Bene ; Zandvliet, Henricus J.W. / Germanene termination of Ge2Pt crystals on Ge(110). In: Journal of physics: Condensed matter. 2014 ; Vol. 26, No. 44. pp. 442001-.
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title = "Germanene termination of Ge2Pt crystals on Ge(110)",
abstract = "We have investigated the growth of Pt on Ge(1 1 0) using scanning tunneling microscopy and spectroscopy. The deposition of several monolayers of Pt on Ge(1 1 0) followed by annealing at 1100 K results in the formation of 3D metallic Pt-Ge nanocrystals. The outermost layer of these crystals exhibits a honeycomb structure. The honeycomb structure is composed of two hexagonal sub-lattices that are displaced vertically by 0.2 {\AA} with respect to each other. The nearest-neighbor distance of the atoms in the honeycomb lattice is 2.5  ±  0.1 {\AA}, i.e. very close to the predicted nearest-neighbor distance in germanene (2.4 {\AA}). Scanning tunneling spectroscopy reveals that the atomic layer underneath the honeycomb layer is more metallic than the honeycomb layer itself. These observations are in line with a model recently proposed for metal di-(silicides/)germanides: a hexagonal crystal with metal layers separated by semiconductor layers with a honeycomb lattice. Based on our observations we propose that the outermost layer of the Ge2Pt nanocrystal is a germanene layer",
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Germanene termination of Ge2Pt crystals on Ge(110). / Bampoulis, Pantelis; Zhang, Lijie; Safaei, A.; van Gastel, Raoul; Poelsema, Bene; Zandvliet, Henricus J.W.

In: Journal of physics: Condensed matter, Vol. 26, No. 44, 442001, 2014, p. 442001-.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Germanene termination of Ge2Pt crystals on Ge(110)

AU - Bampoulis, Pantelis

AU - Zhang, Lijie

AU - Safaei, A.

AU - van Gastel, Raoul

AU - Poelsema, Bene

AU - Zandvliet, Henricus J.W.

PY - 2014

Y1 - 2014

N2 - We have investigated the growth of Pt on Ge(1 1 0) using scanning tunneling microscopy and spectroscopy. The deposition of several monolayers of Pt on Ge(1 1 0) followed by annealing at 1100 K results in the formation of 3D metallic Pt-Ge nanocrystals. The outermost layer of these crystals exhibits a honeycomb structure. The honeycomb structure is composed of two hexagonal sub-lattices that are displaced vertically by 0.2 Å with respect to each other. The nearest-neighbor distance of the atoms in the honeycomb lattice is 2.5  ±  0.1 Å, i.e. very close to the predicted nearest-neighbor distance in germanene (2.4 Å). Scanning tunneling spectroscopy reveals that the atomic layer underneath the honeycomb layer is more metallic than the honeycomb layer itself. These observations are in line with a model recently proposed for metal di-(silicides/)germanides: a hexagonal crystal with metal layers separated by semiconductor layers with a honeycomb lattice. Based on our observations we propose that the outermost layer of the Ge2Pt nanocrystal is a germanene layer

AB - We have investigated the growth of Pt on Ge(1 1 0) using scanning tunneling microscopy and spectroscopy. The deposition of several monolayers of Pt on Ge(1 1 0) followed by annealing at 1100 K results in the formation of 3D metallic Pt-Ge nanocrystals. The outermost layer of these crystals exhibits a honeycomb structure. The honeycomb structure is composed of two hexagonal sub-lattices that are displaced vertically by 0.2 Å with respect to each other. The nearest-neighbor distance of the atoms in the honeycomb lattice is 2.5  ±  0.1 Å, i.e. very close to the predicted nearest-neighbor distance in germanene (2.4 Å). Scanning tunneling spectroscopy reveals that the atomic layer underneath the honeycomb layer is more metallic than the honeycomb layer itself. These observations are in line with a model recently proposed for metal di-(silicides/)germanides: a hexagonal crystal with metal layers separated by semiconductor layers with a honeycomb lattice. Based on our observations we propose that the outermost layer of the Ge2Pt nanocrystal is a germanene layer

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