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Catalytic subsurface etching of nanoscale channels in graphite

Lukas, Maya and Meded, Velimir and Vijayaraghavan, Aravind and Song, Li and Ajayan, Pulickel M. and Fink, Karin and Wenzel, Wolfgang and Krupke, Ralph (2013):
Catalytic subsurface etching of nanoscale channels in graphite.
In: Nature Communications, Nature Publishing Group, p. 1379, 4, ISSN 2041-1723,
[Online-Edition: http://dx.doi.org/10.1038/ncomms2399],
[Article]

Abstract

Catalytic hydrogenation of graphite has recently attracted renewed attention as a route for nanopatterning of graphene and to produce graphene nanoribbons. These reports show that metallic nanoparticles etch the surface layers of graphite or graphene anisotropically along the crystallographic zig-zag ‹11–20› or armchair ‹10–10› directions. The etching direction can be influenced by external magnetic fields or the supporting substrate. Here we report the subsurface etching of highly oriented pyrolytic graphite by Ni nanoparticles, to form a network of tunnels, as seen by scanning electron microscopy and scanning tunnelling microscopy. In this new nanoporous form of graphite, the top layers bend inward on top of the tunnels, whereas their local density of states remains fundamentally unchanged. Engineered nanoporous tunnel networks in graphite allow for further chemical modification and may find applications in various fields and in fundamental science research.

Item Type: Article
Erschienen: 2013
Creators: Lukas, Maya and Meded, Velimir and Vijayaraghavan, Aravind and Song, Li and Ajayan, Pulickel M. and Fink, Karin and Wenzel, Wolfgang and Krupke, Ralph
Title: Catalytic subsurface etching of nanoscale channels in graphite
Language: English
Abstract:

Catalytic hydrogenation of graphite has recently attracted renewed attention as a route for nanopatterning of graphene and to produce graphene nanoribbons. These reports show that metallic nanoparticles etch the surface layers of graphite or graphene anisotropically along the crystallographic zig-zag ‹11–20› or armchair ‹10–10› directions. The etching direction can be influenced by external magnetic fields or the supporting substrate. Here we report the subsurface etching of highly oriented pyrolytic graphite by Ni nanoparticles, to form a network of tunnels, as seen by scanning electron microscopy and scanning tunnelling microscopy. In this new nanoporous form of graphite, the top layers bend inward on top of the tunnels, whereas their local density of states remains fundamentally unchanged. Engineered nanoporous tunnel networks in graphite allow for further chemical modification and may find applications in various fields and in fundamental science research.

Journal or Publication Title: Nature Communications
Volume: 4
Publisher: Nature Publishing Group
Uncontrolled Keywords: Chemical sciences, Inorganic chemistry, Materials science, Nanotechnology
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Molekulare Nanostrukturen
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 28 Feb 2013 08:57
Official URL: http://dx.doi.org/10.1038/ncomms2399
Identification Number: doi:10.1038/ncomms2399
Funders: L.S. and P.M.A. acknowledge the support from the office of Naval Research through the MURI program on graphene and the Exotic Nanocarbons, Japan Regional Innovation Strategy Program by Excellence, JST., P.M.A. acknowledges the AvH foundation for the senior Humboldt-Helmholtz award to perform research in Germany., V.M. acknowledges the MMM@HPC EC project for financial support.
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