Oxidation of graphene on metals

Details Oxidation of graphene on metals Oxidation of graphene on metals

2010-01-27

arxiv.org/abs/1001.4837v2

Journal of Physical Chemistry C Volume: 114 Issue: 11 Pages: 5134-5140 Published: MAR 25 2010

Physics

Condensed Matter

Materials Science

15 pages, 10 figures. Manuscript revised to improve discussion, following referee comments. Accepted for publication in Journa

Scientific paper

10.1021/jp912139e

We use low-energy electron microscopy to investigate how graphene is removed from Ru(0001) and Ir(111) by reaction with oxygen. We find two mechanisms on Ru(0001). At short times, oxygen reacts with carbon monomers on the surrounding Ru surface, decreasing their concentration below the equilibrium value. This undersaturation causes a flux of carbon from graphene to the monomer gas. In this initial mechanism, graphene is etched at a rate that is given precisely by the same non-linear dependence on carbon monomer concentration that governs growth. Thus, during both growth and etching, carbon attaches and detaches to graphene as clusters of several carbon atoms. At later times, etching accelerates. We present evidence that this process involves intercalated oxygen, which destabilizes graphene. On Ir, this mechanism creates observable holes. It also occurs mostly quickly near wrinkles in the graphene islands, depends on the orientation of the graphene with respect to the Ir substrate, and, in contrast to the first mechanism, can increase the density of carbon monomers. We also observe that both layers of bilayer graphene islands on Ir etch together, not sequentially.

Affiliated with

Also associated with

No associations

Rating

Oxidation of graphene on metals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Oxidation of graphene on metals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxidation of graphene on metals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-238688