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Epitaxial graphene on SiC (000(1)over-bar): functional electrical microscopy studies and effect of atmosphere.

Kazakova, O; Burnett, T L; Pattern, J; Yang, L; Yakimova, R* (2013) Epitaxial graphene on SiC (000(1)over-bar): functional electrical microscopy studies and effect of atmosphere. Nanotechnology, 24 (21). 215702

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Abstract

Surface potential distribution, VCPD, and evolution of atmospheric adsorbates on few and multiple layers (FLG and MLG) of graphene grown on SiC(000-1) substrate have been investigated by electrostatic and Kelvin Force Microscopy techniques at T=20-120 °C. The change of the surface potential distribution, VCPD, between FLG and MLG is shown to be temperature dependent. The enhanced VCPD value at 120 °C is associated with desorption of adsorbates at high temperatures and the corresponding change of the carrier balance. The nature of the adsorbates and their evolution with temperature are considered to be related to the process of adsorption and desorption of the atmospheric water on MLG domains. We demonstrate that both the nano- and microscale wettability of the material are strongly dependant on the number of graphene layers.

Item Type: Article
Subjects: Nanoscience
Nanoscience > Nano-Materials
Identification number/DOI: 10.1088/0957-4484/24/21/215702
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5803

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