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Bottom-up formation of robust gold carbide

A new phenomenon of structural reorganization is discovered and characterized for a gold-carbon system by in-situ atomic-resolution imaging at temperatures up to 1300 K. Here, a graphene sheet serves in three ways, as a quasi transparent substrate for aberration-corrected high-resolution transmissio...

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Autores principales: Westenfelder, Benedikt, Biskupek, Johannes, Meyer, Jannik C., Kurasch, Simon, Lin, Xiaohang, Scholz, Ferdinand, Gross, Axel, Kaiser, Ute
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5390915/
https://www.ncbi.nlm.nih.gov/pubmed/25772348
http://dx.doi.org/10.1038/srep08891
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author Westenfelder, Benedikt
Biskupek, Johannes
Meyer, Jannik C.
Kurasch, Simon
Lin, Xiaohang
Scholz, Ferdinand
Gross, Axel
Kaiser, Ute
author_facet Westenfelder, Benedikt
Biskupek, Johannes
Meyer, Jannik C.
Kurasch, Simon
Lin, Xiaohang
Scholz, Ferdinand
Gross, Axel
Kaiser, Ute
author_sort Westenfelder, Benedikt
collection PubMed
description A new phenomenon of structural reorganization is discovered and characterized for a gold-carbon system by in-situ atomic-resolution imaging at temperatures up to 1300 K. Here, a graphene sheet serves in three ways, as a quasi transparent substrate for aberration-corrected high-resolution transmission electron microscopy, as an in-situ heater, and as carbon supplier. The sheet has been decorated with gold nanoislands beforehand. During electron irradiation at 80 kV and at elevated temperatures, the accumulation of gold atoms has been observed on defective graphene sites or edges as well as at the facets of gold nanocrystals. Both resulted in clustering, forming unusual crystalline structures. Their lattice parameters and surface termination differ significantly from standard gold nanocrystals. The experimental data, supported by electron energy loss spectroscopy and density-functional theory calculations, suggests that isolated gold and carbon atoms form – under conditions of heat and electron irradiation – a novel type of compound crystal, Au-C in zincblende structure. The novel material is metastable, but surprisingly robust, even under annealing condition.
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spelling pubmed-53909152017-04-17 Bottom-up formation of robust gold carbide Westenfelder, Benedikt Biskupek, Johannes Meyer, Jannik C. Kurasch, Simon Lin, Xiaohang Scholz, Ferdinand Gross, Axel Kaiser, Ute Sci Rep Article A new phenomenon of structural reorganization is discovered and characterized for a gold-carbon system by in-situ atomic-resolution imaging at temperatures up to 1300 K. Here, a graphene sheet serves in three ways, as a quasi transparent substrate for aberration-corrected high-resolution transmission electron microscopy, as an in-situ heater, and as carbon supplier. The sheet has been decorated with gold nanoislands beforehand. During electron irradiation at 80 kV and at elevated temperatures, the accumulation of gold atoms has been observed on defective graphene sites or edges as well as at the facets of gold nanocrystals. Both resulted in clustering, forming unusual crystalline structures. Their lattice parameters and surface termination differ significantly from standard gold nanocrystals. The experimental data, supported by electron energy loss spectroscopy and density-functional theory calculations, suggests that isolated gold and carbon atoms form – under conditions of heat and electron irradiation – a novel type of compound crystal, Au-C in zincblende structure. The novel material is metastable, but surprisingly robust, even under annealing condition. Nature Publishing Group 2015-03-16 /pmc/articles/PMC5390915/ /pubmed/25772348 http://dx.doi.org/10.1038/srep08891 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Westenfelder, Benedikt
Biskupek, Johannes
Meyer, Jannik C.
Kurasch, Simon
Lin, Xiaohang
Scholz, Ferdinand
Gross, Axel
Kaiser, Ute
Bottom-up formation of robust gold carbide
title Bottom-up formation of robust gold carbide
title_full Bottom-up formation of robust gold carbide
title_fullStr Bottom-up formation of robust gold carbide
title_full_unstemmed Bottom-up formation of robust gold carbide
title_short Bottom-up formation of robust gold carbide
title_sort bottom-up formation of robust gold carbide
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5390915/
https://www.ncbi.nlm.nih.gov/pubmed/25772348
http://dx.doi.org/10.1038/srep08891
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