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Title: Insight into hydrogenation of graphene: Effect of hydrogen plasma chemistry

Plasma hydrogenation of graphene has been proposed as a tool to modify the properties of graphene. However, hydrogen plasma is a complex system and controlled hydrogenation of graphene suffers from a lack of understanding of the plasma chemistry. Here, we correlate the modifications induced on monolayer graphene studied by Raman spectroscopy with the hydrogen ions energy distributions obtained by mass spectrometry. We measure the energy distribution of H{sup +}, H{sub 2}{sup +}, and H{sub 3}{sup +} ions for different plasma conditions showing that their energy strongly depends on the sample position, pressure, and plasma power and can reach values as high as 45‚ÄČeV. Based on these measurements, we speculate that under specific plasma parameters, protons should possess enough energy to penetrate the graphene sheet. Therefore, a graphene membrane could become, under certain conditions, transparent to both protons and electrons.
Authors:
; ;  [1] ;  [2] ; ;  [3]
  1. Research Center in Physics of Matter and Radiation (PMR), University of Namur, Namur (Belgium)
  2. School of Physics and Astronomy, University of Manchester, Manchester (United Kingdom)
  3. School of Chemistry and Photon Science Institute, University of Manchester, Manchester (United Kingdom)
Publication Date:
OSTI Identifier:
22310713
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRONS; ENERGY SPECTRA; GRAPHENE; HYDROGEN; HYDROGEN IONS 1 PLUS; HYDROGENATION; MASS SPECTROSCOPY; MEMBRANES; MODIFICATIONS; MOLECULAR IONS; PLASMA; PROTONS; RAMAN SPECTROSCOPY