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Microscopic characterisation of suspended graphene grown by chemical vapour deposition

We demonstrate that the suspended graphene membrane locally shows electronic properties comparable with those of samples prepared by micromechanical cleaving of graphite. Measurements show that the area of high quality suspended graphene is limited by the folding of the graphene during the transfer.
L. Bignardi et al, Nanoscale 5, 9057 (2013).

Herein, we present a study of graphene grown by CVD on copper and subsequently transferred onto TEM grids to produce a suspended layer. Angle-resolved photoemission spectroscopy and microscopy revealed the local electronic structure of this suspended graphene. TEM, electron diffraction and Raman spectroscopy yielded information about the morphology as well as the crystallographic ordering of the suspended areas. These techniques showed that in the suspended areas our samples exhibit single-crystalline domains as well as the electronic structure of non-interacting graphene, despite the polycrystalline nature of the substrate used for the growth.

In panel a we report an angle-resolved photoemissionspectrum acquired on suspended graphene, with a photon beam energy of 27 eV, spanning the band dispersion along the GK direction of the Brillouin zone of graphene. In panels b, d TEM images with corresponding c, e micro diffarction patterns are shown

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Microscopic characterisation of suspended graphene grown by chemical vapour deposition by L. Bignardi, W. F. van Dorp, S. Gottardi, O. Ivashenko, P. Dudin, A. Barinov, J.T.M de Hosson, M. Stöhr, P. Rudolf, Nanoscale 5, 9057 (2013)
Last Updated on Tuesday, 28 April 2015 13:01