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Large changes of graphene conductance as a function of lattice orientation between stacked layers

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Title
Large changes of graphene conductance as a function of lattice orientation between stacked layers
Author(s)
Hyunsoo Lee; Qi Y.; Sangku Kwon; Salmeron M.; Jeong Young Park
Publication Date
2015-01
Journal
NANOTECHNOLOGY, v.26, no.1, pp.015702 -
Publisher
IOP PUBLISHING LTD
Abstract
Using the conductive tip of an atomic force microscope as an electrode, we found that the electrical conductance of graphite terraces separated by steps can vary by large factors of up to 100, depending on the relative lattice orientation of the surface and subsurface layers. This effect can be attributed to interlayer interactions that, when stacked commensurately in a Bernal sequence (ABAB…), cause the band gap to open. Misaligned layers, on the other hand, behave like graphene. Angular misorientations of a few degrees were found to cause large increases in the conductance of the top layer, with the maximum occurring around 30°. These results suggest new applications for graphene multilayers by stacking layers at various angles to control the resistance of the connected graphene ribbons in devices.
URI
https://pr.ibs.re.kr/handle/8788114/830
ISSN
0957-4484
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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