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A comparative study on few-layer graphene production by exfoliation of different starting materials in a low boiling point solvent

Çelik, Yasemin and Flahaut, Emmanuel and Suvacı, Ender A comparative study on few-layer graphene production by exfoliation of different starting materials in a low boiling point solvent. (2017) FlatChem, 1. 74-88. ISSN 2452-2627

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Official URL: http://dx.doi.org/10.1016/j.flatc.2016.12.002

Abstract

Three different graphite-based powders (expandable graphite and two different nano-graphite powders) were investigated as starting materials for an effective liquid phase exfoliation process in isopropyl alcohol (IPA). The prepared dispersions were analyzed and compared in terms of their graphene concentration, stability, number of graphene layers and quality, as well as the electrical conductivity of the prepared graphene-based materials. Good quality graphene dispersions (ID/IG < 0.3) with a relatively high concentration (∼1.1 mg/ml) were prepared in IPA within 90 min sonication time by utilizing a high specific surface area (∼175 m2/g) nano-graphite powder derived from natural graphite. Transmission electron microscope analyses of this sample revealed mostly folded and scrolled few layer graphene (FLG) sheets (<5 layers) entangled each other. The electrical conductivity of the thin film prepared from this dispersion was ∼15 and 86 S/m, before and after annealing, respectively. FLG prepared from expanded graphite, obtained by thermal treatment of expandable graphite, exhibited both much higher quality (ID/IG < 0.09) and electrical conductivity (∼2104 and 19,200 S/m before and after annealing, respectively) when dispersed in IPA for 90 min. However, the graphene-based material concentration of the prepared dispersion was relatively low (∼0.06 mg/ml).

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at http://www.sciencedirect.com/science/article/pii/S2452262716300630
HAL Id:hal-01537861
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Anadolu University (TURKEY)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:13 Jun 2017 08:01

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