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Pure hydrogen low-temperature plasma exposure of HOPG and graphene: Graphane formation?

Eren, B. and Hug, D. and Marot, L. and Pawlak, R. and Kisiel, M. and Steiner, R. and Zumbühl, D. M. and Meyer, E.. (2012) Pure hydrogen low-temperature plasma exposure of HOPG and graphene: Graphane formation? Beilstein journal of nanotechnology, Vol. 3. pp. 852-859.

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Official URL: http://edoc.unibas.ch/dok/A6083411

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
UniBasel Contributors:Meyer, Ernst and Marot, Laurent and Zumbühl, Dominik M
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Beilstein-Institut zur Förderung der Chemischen Wissenschaften
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:31 Dec 2015 10:52
Deposited On:24 May 2013 09:02

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