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Electrostatic transparency of graphene oxide sheets.

Giusca, C E; Perrozzi, F*; Melios, C; Ottaviano, L*; Treossi, E*; Palermo, V*; Kazakova, O (2015) Electrostatic transparency of graphene oxide sheets. Carbon, 86. pp. 188-196.

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Abstract

The interaction of graphene oxide of varying reduction degrees with dielectric and metallic surfaces has been probed in this study using scanning Kelvin probe microscopy and Raman spectroscopy, in order to assess the influence that the supporting substrate has on the electronic properties of graphene oxide and its reduced form. Lateral inhomogeneities in the distribution of subsurface charged impurities were found to affect the electronic properties of graphene oxide, giving rise to significant in-plane variations of the local electrostatic potential on reduced single layer graphene oxide supported on dielectric substrates. On the contrary, no such surface potential fluctuations were identified on as-produced graphene oxide sheets, due to their insulating nature, or on graphene oxide layers deposited on a metallic substrate. Consistent with effective screening effects for thicker sheets, it is shown that reduced bi-layer graphene oxide on dielectric substrates is not electrostatically transparent to substrate trapped charge impurities. The current study provides a useful account of the limitations that device performance could face when attempting to tune the electronic structure of graphene oxide via chemical functionalization, highlighting the role of substrate-related disorder affecting the behaviour of nanodevices. The role of the substrate is particularly important for applications where electronic properties of graphene oxide are especially targeted, such as transparent conducting films, sensors and electrochemical devices.

Item Type: Article
Keywords: graphene oxide, surface potential, charged impurities, scanning Kelvin probe microscopy, Raman spectroscopy
Subjects: Nanoscience
Nanoscience > Nano-Materials
Identification number/DOI: 10.1016/j.carbon.2015.01.035
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6649

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