Issue 73, 2018

Influence of atmospheric species on the electrical properties of functionalized graphene sheets

Abstract

We report on the time-dependent influence of atmospheric species on the electrical properties of functionalized graphene sheets (FGSs). When exposed to laboratory air, FGSs exhibit a significant, irreversible decrease in electrical conductance with time, strongly depending on the oxygen content of the FGSs. To separate the roles of charge carrier density and mobility in this aging process, we performed electron transport measurements using a back-gate field-effect transistor architecture. Investigating the position of the Dirac point under different atmospheres, we found that adsorbed atmospheric species result in pronounced p-doping, which – on a short time scale – can be reversed under nitrogen atmosphere. However, on a time scale of several days, the resistance increases irreversibly, while the Dirac point voltage remains constant. From these experiments, we conclude that the aging of FGSs is related to the chemisorption of atmospheric species leading to enhanced carrier scattering due to an increasing amount of sp3- regions and thus to a reduced charge carrier mobility.

Graphical abstract: Influence of atmospheric species on the electrical properties of functionalized graphene sheets

Article information

Article type
Paper
Submitted
04 Oct 2018
Accepted
10 Dec 2018
First published
18 Dec 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 42073-42079

Influence of atmospheric species on the electrical properties of functionalized graphene sheets

B. Bekdüz, L. Kampermann, W. Mertin, C. Punckt, I. A. Aksay and G. Bacher, RSC Adv., 2018, 8, 42073 DOI: 10.1039/C8RA08227H

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