Current-Driven Hydrogen Desorption from Graphene: Experiment and Theory

The Journal of Physical Chemistry Letters
Li GaoJeffrey R Guest

Abstract

Electron-stimulated desorption of hydrogen from the graphene/SiC(0001) surface at room temperature was investigated with ultrahigh vacuum scanning tunneling microscopy and ab initio calculations in order to elucidate the desorption mechanisms and pathways. Two different desorption processes were observed. In the high electron energy regime (4-8 eV), the desorption yield is independent of both voltage and current, which is attributed to the direct electronic excitation of the C-H bond. In the low electron energy regime (2-4 eV), however, the desorption yield exhibits a threshold dependence on voltage, which is explained by the vibrational excitation of the C-H bond via transient ionization induced by inelastic tunneling electrons. The observed current independence of the desorption yield suggests that the vibrational excitation is a single-electron process. We also observed that the curvature of graphene dramatically affects hydrogen desorption. Desorption from concave regions was measured to be much more probable than desorption from convex regions in the low electron energy regime (∼2 eV), as would be expected from the identified desorption mechanism.

References

Apr 15, 1994·Physical Review. B, Condensed Matter·G P SalamR E Palmer
Apr 30, 1990·Physical Review Letters·P Guyot-SionnestG S Higashi
Oct 23, 2004·Science·K S NovoselovA A Firsov
Sep 24, 2005·The Journal of Chemical Physics·S DeniflT D Märk
Nov 11, 2005·Nature·K S NovoselovA A Firsov
Apr 15, 2006·Science·Claire BergerWalt A de Heer
Aug 19, 2006·Science·Taisuke OhtaEli Rotenberg
Feb 17, 2007·Science·K S NovoselovA K Geim
Mar 3, 2007·Nature·Jannik C MeyerS Roth
Jul 14, 2007·Science·G M RutterJ A Stroscio
Nov 4, 2008·Annual Review of Physical Chemistry·Michael A Walsh, Mark C Hersam
Feb 10, 2009·Nature Materials·Konstantin V EmtsevThomas Seyller
Feb 12, 2009·The Journal of Chemical Physics·Simone CasoloGian Franco Tantardini
Mar 24, 2009·Nano Letters·Nathan P GuisingerJoseph A Stroscio
Jun 6, 2009·Journal of the American Chemical Society·Richard BalogLiv Hornekaer
Sep 4, 2009·The Journal of Chemical Physics·Z SljivancaninB Hammer
Oct 2, 2009·Physical Review Letters·Aaron BostwickEli Rotenberg
Nov 4, 2009·Nano Letters·Paolo SessiNathan P Guisinger
Jan 12, 2010·The Journal of Chemical Physics·Ryan Jorn, Tamar Seideman
Feb 6, 2010·Science·Y-M LinPh Avouris
Mar 17, 2010·Nature Materials·Richard BalogLiv Hornekaer
May 15, 2010·Accounts of Chemical Research·Ryan Jorn, Tamar Seideman
Sep 30, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Paolo GiannozziRenata M Wentzcovitch
Oct 15, 2011·Advanced Materials·Danny HabererAlexander Grüneis
May 15, 2012·Nano Letters·Jongweon ChoNathan P Guisinger
Nov 21, 2012·Physical Chemistry Chemical Physics : PCCP·Valentina Tozzini, Vittorio Pellegrini
Apr 17, 2013·ACS Nano·Richard BalogSilvano Lizzit
Feb 3, 2015·Chemistry : a European Journal·Wei ZhaoChristian Papp

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