On the mechanism for plasma hydrogenation of graphene
Applied Physics Letters
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... tt. 100, 046101 (2012) Ignition of an exothermal reaction by collision between Al and Ni crystals We report that hydrogenation of mono-, bi-, and trilayer graphene samples via exposure to H 2 plasma occurs as a result of electron irradiation of H 2 O adsorbates on the samples, rather than H species in the plasma as reported by ͓Elias et al., Science 323, 610 ͑2009͔͒. We propose that the hydrogenation mechanism is electron-impact fragmentation of H 2 O adsorbates into H + ions. At incident electron energies Ͼ60 eV, we observe hydrogenation that is significantly more stable at temperatures Ͼ200°C than previously reported.