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Muons probe strong hydrogen interactions with defective graphene.

Authors :
Riccò M
Pontiroli D
Mazzani M
Choucair M
Stride JA
Yazyev OV
Source :
Nano letters [Nano Lett] 2011 Nov 09; Vol. 11 (11), pp. 4919-22. Date of Electronic Publication: 2011 Oct 13.
Publication Year :
2011

Abstract

Here, we present the first muon spectroscopy investigation of graphene, focused on chemically produced, gram-scale samples, appropriate to the large muon penetration depth. We have observed an evident muon spin precession, usually the fingerprint of magnetic order, but here demonstrated to originate from muon-hydrogen nuclear dipolar interactions. This is attributed to the formation of CHMu (analogous to CH(2)) groups, stable up to 1250 K where the signal still persists. The relatively large signal amplitude demonstrates an extraordinary hydrogen capture cross section of CH units. These results also rule out the formation of ferromagnetic or antiferromagnetic order in chemically synthesized graphene samples.

Details

Language :
English
ISSN :
1530-6992
Volume :
11
Issue :
11
Database :
MEDLINE
Journal :
Nano letters
Publication Type :
Academic Journal
Accession number :
21988328
Full Text :
https://doi.org/10.1021/nl202866q