Journal
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume 3, Issue -, Pages 852-859Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.3.96
Keywords
graphane; HOPG; hydrogenation; plasma
Funding
- Swiss Federal Office of Energy
- Federal Office for Education and Science
- Swiss National Foundation (SNF)
- National Centre of Competence in Research on Nanoscale Science (NCCR Nano)
- National Centre of Competence in Research on Quantum Science and Technology (NCCR QSIT)
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Single- and multilayer graphene and highly ordered pyrolytic graphite (HOPG) were exposed to a pure hydrogen low-temperature plasma (LTP). Characterizations include various experimental techniques such as photoelectron spectroscopy, Raman spectroscopy and scanning probe microscopy. Our photoemission measurement shows that hydrogen LTP exposed HOPG has a diamond-like valence-band structure, which suggests double-sided hydrogenation. With the scanning tunneling microscopy technique, various atomic-scale charge-density patterns were observed, which may be associated with different C-H conformers. Hydrogen-LTP-exposed graphene on SiO2 has a Raman spectrum in which the D peak to G peak ratio is over 4, associated with hydrogenation on both sides. A very low defect density was observed in the scanning probe microscopy measurements, which enables a reverse transformation to graphene. Hydrogen-LTP-exposed HOPG possesses a high thermal stability, and therefore, this transformation requires annealing at over 1000 degrees C.
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