Graphene Supported Graphone/Graphane Bilayer Nanostructure Material for Spintronics

SC Ray, N Soin, T Makgato, CH Chuang, WF Pong, SS Roy, SK Ghosh, AM Strydom, JAD McLaughlin

Research output: Contribution to journalArticle

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Abstract

We report an investigation into the magnetic and electronic properties of partially hydrogenated verticallyaligned few layers graphene (FLG) synthesized by microwave plasma enhanced chemical vapor deposition. The FLG samples are hydrogenated at different substrate temperatures to alter the degree of hydrogenation and their depth profile. The unique morphology of the structure gives rise to a unique geometry in which graphane/graphone is supported by graphene layers in the bulk, which is very different from other widely studied structures such as one-dimensional nanoribbons. Synchrotron based x-ray absorption fine structure spectroscopy measurements have been used to investigate the electronic structure and the underlying hydrogenation mechanism responsible for the magnetic properties. While ferromagnetic interactions seem to be predominant, the presence of antiferromagnetic interaction was also observed. Free spins available via the conversion of sp2 to sp3 hybridized structures, and the possibility of unpaired electrons from defects induced upon hydrogenation are thought to be likely mechanisms for the observed ferromagnetic orders
LanguageEnglish
JournalScientific Reports
Volume4
Issue number3862
DOIs
Publication statusPublished - 2014

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Magnetoelectronics
Graphite
Hydrogenation
Nanostructures
Magnetic properties
Carbon Nanotubes
Plasma enhanced chemical vapor deposition
Synchrotrons
Electronic properties
Electronic structure
Microwaves
Spectroscopy
X rays
Defects
Geometry
Electrons
Substrates
Temperature

Cite this

Ray, SC ; Soin, N ; Makgato, T ; Chuang, CH ; Pong, WF ; Roy, SS ; Ghosh, SK ; Strydom, AM ; McLaughlin, JAD. / Graphene Supported Graphone/Graphane Bilayer Nanostructure Material for Spintronics. In: Scientific Reports. 2014 ; Vol. 4, No. 3862.
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abstract = "We report an investigation into the magnetic and electronic properties of partially hydrogenated verticallyaligned few layers graphene (FLG) synthesized by microwave plasma enhanced chemical vapor deposition. The FLG samples are hydrogenated at different substrate temperatures to alter the degree of hydrogenation and their depth profile. The unique morphology of the structure gives rise to a unique geometry in which graphane/graphone is supported by graphene layers in the bulk, which is very different from other widely studied structures such as one-dimensional nanoribbons. Synchrotron based x-ray absorption fine structure spectroscopy measurements have been used to investigate the electronic structure and the underlying hydrogenation mechanism responsible for the magnetic properties. While ferromagnetic interactions seem to be predominant, the presence of antiferromagnetic interaction was also observed. Free spins available via the conversion of sp2 to sp3 hybridized structures, and the possibility of unpaired electrons from defects induced upon hydrogenation are thought to be likely mechanisms for the observed ferromagnetic orders",
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Graphene Supported Graphone/Graphane Bilayer Nanostructure Material for Spintronics. / Ray, SC; Soin, N; Makgato, T; Chuang, CH; Pong, WF; Roy, SS; Ghosh, SK; Strydom, AM; McLaughlin, JAD.

In: Scientific Reports, Vol. 4, No. 3862, 2014.

Research output: Contribution to journalArticle

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