It is shown that the theoretical prediction of a transient magnetization in bilayer and multilayer graphene (M. Moaied, Phys. Rev. B 91, 155419 (2015)PRBMDO1098-012110.1103/PhysRevB.91.155419) relies on an incorrect physical scenario for adsorption, namely, one in which H atoms adsorb barrierless on graphitic substrates and form a random adsorption pattern of monomers. Rather, according to experimental evidence, H atom sticking is an activated process, and adsorption is under kinetic control, largely ruled by a preferential sticking mechanism that leads to stable, nonmagnetic dimers at all but the smallest coverages (<0.004). Theory and experiments are reconciled by reconsidering the hydrogen atom adsorption energetics with the help of van der Waals-inclusive density functional calculations that properly account for the basis set superposition error. It is shown that today van der Waals-density functional theory predicts a shallow physisorption well that nicely agrees with available experimental data and suggests that the hydrogen atom adsorption barrier in graphene is 180 meV high, within ∼5 meV accuracy.

Comment on "theoretical study of the dynamics of atomic hydrogen adsorbed on graphene multilayers" / M. Bonfanti, R. Martinazzo. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 97:11(2018 Mar 21). [10.1103/PhysRevB.97.117401]

Comment on "theoretical study of the dynamics of atomic hydrogen adsorbed on graphene multilayers"

M. Bonfanti
Primo
;
R. Martinazzo
Ultimo
2018

Abstract

It is shown that the theoretical prediction of a transient magnetization in bilayer and multilayer graphene (M. Moaied, Phys. Rev. B 91, 155419 (2015)PRBMDO1098-012110.1103/PhysRevB.91.155419) relies on an incorrect physical scenario for adsorption, namely, one in which H atoms adsorb barrierless on graphitic substrates and form a random adsorption pattern of monomers. Rather, according to experimental evidence, H atom sticking is an activated process, and adsorption is under kinetic control, largely ruled by a preferential sticking mechanism that leads to stable, nonmagnetic dimers at all but the smallest coverages (<0.004). Theory and experiments are reconciled by reconsidering the hydrogen atom adsorption energetics with the help of van der Waals-inclusive density functional calculations that properly account for the basis set superposition error. It is shown that today van der Waals-density functional theory predicts a shallow physisorption well that nicely agrees with available experimental data and suggests that the hydrogen atom adsorption barrier in graphene is 180 meV high, within ∼5 meV accuracy.
Electronic, Optical and Magnetic Materials; Condensed Matter Physics
Settore CHIM/02 - Chimica Fisica
21-mar-2018
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/599773
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