Journal
PHYSICAL REVIEW B
Volume 83, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.033404
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We propose, on the basis of our first-principles density functional based calculations, an interesting isomer of graphane in which the C-H bonds of a hexagon alternate in three-up-three-down fashion on either side of the sheet. This two-dimensional puckered structure, called stirrup, has an intermediate stability between the previously reported chair and boat conformers of graphane. The physicochemical properties of this conformer are found to be similar to the other two conformers of graphane with an insulating direct band gap of 3.1 eV at the Gamma point. Any other alternative hydrogenation of the graphene sheet disrupts its symmetrically puckered geometry and turns out to be energetically less favorable than these three conformers.
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