Functionalization of edge reconstructed graphene nanoribbons by H and Fe: A density functional study
2012 (English)In: Solid State Communications, ISSN 0038-1098, E-ISSN 1879-2766, Vol. 152, no 18, 1719-1724 p.Article in journal (Refereed) Published
In this paper, we have studied functionalization of 5-7 edge-reconstructed graphene nanoribbons by ab initio density functional calculations. Our studies show that hydrogenation at the reconstructed edges is favorable in contrast to the case of unreconstructed 6-6 zigzag edges, in agreement with previous theoretical results. Thermodynamical calculations reveal the relative stability of single and dihydro-genated edges under different temperatures and chemical potential of hydrogen gas. From phonon calculations, we find that the lowest optical phonon modes are hardened due to 5-7 edge reconstruction compared to the 6-6 unreconstructed hydrogenated edges. Finally, edge functionalization by Fe atoms reveals a dimerized Fe chain structure along the edges. The magnetic exchange coupling across the edges varies between ferromagnetic and antiferromagnetic ones with the variation of the width of the nanoribbons.
Place, publisher, year, edition, pages
2012. Vol. 152, no 18, 1719-1724 p.
Graphene, Functionalization, Magnetism, Phonons, Density functional theory
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:uu:diva-177362DOI: 10.1016/j.ssc.2012.06.028ISI: 000308776600003OAI: oai:DiVA.org:uu-177362DiVA: diva2:540752