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• W2275457611 endingPage "125704" @default.
• W2275457611 startingPage "125704" @default.
• W2275457611 abstract "Graphene has emerged as a material with a vast variety of applications. The electronic, optical and mechanical properties of graphene are strongly influenced by the number of layers present in a sample. As a result, the dimensional characterization of graphene films is crucial, especially with the continued development of new synthesis methods and applications. A number of techniques exist to determine the thickness of graphene films including optical contrast, Raman scattering and scanning probe microscopy techniques. Atomic force microscopy (AFM), in particular, is used extensively since it provides three-dimensional images that enable the measurement of the lateral dimensions of graphene films as well as the thickness, and by extension the number of layers present. However, in the literature AFM has proven to be inaccurate with a wide range of measured values for single layer graphene thickness reported (between 0.4 and 1.7 nm). This discrepancy has been attributed to tip-surface interactions, image feedback settings and surface chemistry. In this work, we use standard and carbon nanotube modified AFM probes and a relatively new AFM imaging mode known as PeakForce tapping mode to establish a protocol that will allow users to accurately determine the thickness of graphene films. In particular, the error in measuring the first layer is reduced from 0.1-1.3 nm to 0.1-0.3 nm. Furthermore, in the process we establish that the graphene-substrate adsorbate layer and imaging force, in particular the pressure the tip exerts on the surface, are crucial components in the accurate measurement of graphene using AFM. These findings can be applied to other 2D materials." @default.
• W2275457611 created "2016-06-24" @default.
• W2275457611 creator A5004501311 @default.
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• W2275457611 date "2016-02-19" @default.
• W2275457611 modified "2023-10-12" @default.
• W2275457611 title "Accurate thickness measurement of graphene" @default.
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• W2275457611 doi "https://doi.org/10.1088/0957-4484/27/12/125704" @default.
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• W2275457611 hasPublicationYear "2016" @default.
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