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The formation of self-assembled nanowire arrays on Ge(001): a DFT study of Pt induced nanowire arrays

Danny Vanpoucke UGent and Brocks Geert (2009) MATERIALS RESEARCH SOCIETY SYMPOSIA PROCEEDINGS. 1177E. p.1177-Z03-09-1-1177-Z03-09-6
abstract
Nanowire (NW) arrays form spontaneously after high temperature annealing of a sub monolayer deposition of Pt on a Ge(001) surface. These NWs are a single atom wide, with a length limited only by the underlying beta-terrace to which they are uniquely connected. Using ab-initio density functional theory (DFT) calculations we study possible geometries of the NWs and substrate. Direct comparison to experiment is made via calculated scanning tunneling microscope (STM) images. Based on these images, geometries for the beta-terrace and the NWs are identified, and a formation path for the nanowires as function of increasing local Pt density is presented. We show the beta-terrace to be a dimer row surface reconstruction with a checkerboard pattern of Ge-Ge and Pt-Ge dimers. Most remarkably, comparison of calculated to experimental STM images shows the NWs to consist of germanium atoms embedded in the Pt-lined troughs of the underlying surface, contrary to what was assumed previously in experiments.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
scanning tunneling microscopy (STM), self-assembly, simulation
in
MATERIALS RESEARCH SOCIETY SYMPOSIA PROCEEDINGS
Mater. Res. Soc. Symp. Proc.
editor
Danny Vanpoucke UGent
volume
1177E
article_number
Z03-09
pages
1177-Z03-09-1 - 1177-Z03-09-6
publisher
Materials Research Society
place of publication
Warrendale, PA, USA
conference name
Materials Research Society : Advancing materials Improving the quality of life (MRS - 2009)
conference location
San Fransisco, CA, USA
conference start
2009-04-13
conference end
2009-04-17
ISSN
0272-9172
DOI
10.1557/PROC-1177-Z03-09
language
English
UGent publication?
no
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1109126
handle
http://hdl.handle.net/1854/LU-1109126
alternative location
http://www.mrs.org/s_mrs/sec_subscribe.asp?CID=18413&DID=319656&action=detail
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=7969723&fulltextType=RA&fileId=S1946427400010538
date created
2011-01-24 14:27:11
date last changed
2011-05-26 08:56:36
@inproceedings{1109126,
  abstract     = {Nanowire (NW) arrays form spontaneously after high temperature annealing of a sub monolayer deposition of Pt on a Ge(001) surface. These NWs are a single atom wide, with a length limited only by the underlying beta-terrace to which they are uniquely connected. Using ab-initio density functional theory (DFT) calculations we study possible geometries of the NWs and substrate. Direct comparison to experiment is made via calculated scanning tunneling microscope (STM) images. Based on these images, geometries for the beta-terrace and the NWs are identified, and a formation path for the nanowires as function of increasing local Pt density is presented. We show the beta-terrace to be a dimer row surface reconstruction with a checkerboard pattern of Ge-Ge and Pt-Ge dimers. Most remarkably, comparison of calculated to experimental STM images shows the NWs to consist of germanium atoms embedded in the Pt-lined troughs of the underlying surface, contrary to what was assumed previously in experiments.},
  articleno    = {Z03-09},
  author       = {Vanpoucke, Danny and Geert, Brocks},
  booktitle    = {MATERIALS RESEARCH SOCIETY SYMPOSIA PROCEEDINGS},
  editor       = {Vanpoucke, Danny},
  issn         = {0272-9172},
  keyword      = {scanning tunneling microscopy (STM),self-assembly,simulation},
  language     = {eng},
  location     = {San Fransisco, CA, USA},
  pages        = {Z03-09:1177-Z03-09-1--Z03-09:1177-Z03-09-6},
  publisher    = {Materials Research Society},
  title        = {The formation of self-assembled nanowire arrays on Ge(001): a DFT study of Pt induced nanowire arrays},
  url          = {http://dx.doi.org/10.1557/PROC-1177-Z03-09},
  volume       = {1177E},
  year         = {2009},
}

Chicago
Vanpoucke, Danny, and Brocks Geert. 2009. “The Formation of Self-assembled Nanowire Arrays on Ge(001): a DFT Study of Pt Induced Nanowire Arrays.” In Materials Research Society Symposia Proceedings, ed. Danny Vanpoucke, 1177E:1177–Z03–09–1–1177–Z03–09–6. Warrendale, PA, USA: Materials Research Society.
APA
Vanpoucke, D., & Geert, B. (2009). The formation of self-assembled nanowire arrays on Ge(001): a DFT study of Pt induced nanowire arrays. In D. Vanpoucke (Ed.), MATERIALS RESEARCH SOCIETY SYMPOSIA PROCEEDINGS (Vol. 1177E, pp. 1177–Z03–09–1–1177–Z03–09–6). Presented at the Materials Research Society : Advancing materials Improving the quality of life (MRS - 2009), Warrendale, PA, USA: Materials Research Society.
Vancouver
1.
Vanpoucke D, Geert B. The formation of self-assembled nanowire arrays on Ge(001): a DFT study of Pt induced nanowire arrays. In: Vanpoucke D, editor. MATERIALS RESEARCH SOCIETY SYMPOSIA PROCEEDINGS. Warrendale, PA, USA: Materials Research Society; 2009. p. 1177–Z03–09–1–1177–Z03–09–6.
MLA
Vanpoucke, Danny, and Brocks Geert. “The Formation of Self-assembled Nanowire Arrays on Ge(001): a DFT Study of Pt Induced Nanowire Arrays.” Materials Research Society Symposia Proceedings. Ed. Danny Vanpoucke. Vol. 1177E. Warrendale, PA, USA: Materials Research Society, 2009. 1177–Z03–09–1–1177–Z03–09–6. Print.