Insight into hydrogenation of graphene

Effect of hydrogen plasma chemistry

A. Felten, D. McManus, C. Rice, L. Nittler, J. J. Pireaux, C. Casiraghi

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Abstract

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+, H2 +, and H3 + 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 45eV. 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.

Original languageEnglish
Article number183104
JournalApplied Physics Letters
Volume105
Issue number18
DOIs
Publication statusPublished - 3 Nov 2014

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plasma chemistry
hydrogen plasma
hydrogenation
graphene
energy distribution
protons
hydrogen ions
complex systems
mass spectroscopy
Raman spectroscopy
membranes
energy
ions
electrons

Cite this

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Insight into hydrogenation of graphene : Effect of hydrogen plasma chemistry. / Felten, A.; McManus, D.; Rice, C.; Nittler, L.; Pireaux, J. J.; Casiraghi, C.

In: Applied Physics Letters, Vol. 105, No. 18, 183104, 03.11.2014.

Research output: Contribution to journalArticle

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T1 - Insight into hydrogenation of graphene

T2 - Effect of hydrogen plasma chemistry

AU - Felten, A.

AU - McManus, D.

AU - Rice, C.

AU - Nittler, L.

AU - Pireaux, J. J.

AU - Casiraghi, C.

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AB - 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+, H2 +, and H3 + 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 45eV. 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.

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