The structural evolution of graphene/Fe(110) systems upon annealing

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• 作者：N.A. Vinogradov^a ; ^b ; ^c ; ^{nikolay.vinogradov@maxiv.lu.se" class="auth_mail" title="E-mail the corresponding author} ; K.A. Simonov^b ; ^c ; ^d ; A.V. Generalov^b ; ^c ; J. Drnec^a ; F. Carlà ; ^a ; A.S. Vinogradov^b ; A.B. Preobrajenski^c ; N. Må ; rtensson^d ; R. Felici^a ; ^e
• 刊名：Carbon
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：111
• 期：Complete
• 页码：113-120
• 全文大小：2905 K

文摘

The thermal stability and the structural evolution of graphene grown on Fe(110) has been studied upon annealing in ultra-high vacuum conditions (UHV, P ≤ 10⁻⁹ mbar) and in the presence of gaseous ethylene at a pressure of ∼10⁻⁶ mbar by grazing incidence X-ray diffraction. It was observed that upon annealing at temperatures below 630 °C, graphene on Fe is thermally stable. Exposure to ethylene at these temperatures promotes the formation of graphene while inhibiting its deterioration. Annealing graphene/Fe(110) at temperatures above 630 °C results in a fast degradation of graphene followed by carburization of the sample, that is the irreversible formation of various iron carbides, with the most common phases being Fe₃C (cementite) and Fe₇C₃ (Eckström-Adcock carbide). Annealing of the carburized sample does not result in the formation of a detectable graphitic structure.