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Pure hydrogen low-temperature plasma exposure of HOPG and graphene: Graphane formation?
- Source :
- Beilstein Journal of Nanotechnology, Vol 3, Iss 1, Pp 852-859 (2012)
- Publication Year :
- 2012
- Publisher :
- Beilstein-Institut, 2012.
-
Abstract
- 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 °C.
Details
- Language :
- English
- ISSN :
- 21904286
- Volume :
- 3
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Beilstein Journal of Nanotechnology
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.fbcfa7f3e8d94e6e8c6feda1b33db6ac
- Document Type :
- article
- Full Text :
- https://doi.org/10.3762/bjnano.3.96