title: Muons probe strong hydrogen interactions with defective graphene.
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.
authors: Dipartimento di Fisica, Università di Parma, Via G.Usberti 7/a, 43100 Parma, Italy. Mauro.Ricco@fis.unipr.it
authors: Mauro
authors: M
authors: Riccò
authors: Daniele
authors: D
authors: Pontiroli
authors: Marcello
authors: M
authors: Mazzani
authors: Mohammad
authors: M
authors: Choucair
authors: John A
authors: JA
authors: Stride
authors: Oleg V
authors: OV
authors: Yazyev
mesh_terms: D006108:Graphite / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D008422:Materials Testing / Q000379:methods*; D008651:Mesons; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size
chemical_list: D006108:Graphite; D006859:Hydrogen