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Etude de la stabilisation par du PVA de solutions aqueuses de graphène et de graphène oxydé et caractérisation des performances du composite graphène/graphène oxydé - PVA

Abstract : In the past decades, graphene and graphene-based two-dimensional (2D) materials have received increasing interest for various applications such as energy storage, conductivity materials, catalytic reactions, biotechnology, etc. Liquid-phase exfoliation (LPE) is one of the most promising techniques at the industrial scale. The resulting nanosheets colloidal solution can be easily applied as a starting material to the preparation of nanocomposites. Commonly, graphene can be slightly dispersed in specific organic solvents which are generally harmful to environment and difficult to be removed. However, due to its hydrophobic behavior, it is hardly dispersed in water. To circumvent this issue, the polymer assisting LPE has been investigated within this thesis. Using a polymer, like PolyVinyle Alcohol, as stabilizer not only helps graphene dispersion but allows at the same time to get a wearable and biocompatible composite matrix. Here, it was aimed to optimize the graphene/ polymer ratio via polymer concentration control. Understanding the assistance mechanism paths the way for any other 2D material/ polymer/ solvent system application. Besides, the oxidation degree of the graphene is another important factor impacting on the graphene dispersibility in water media. The affinity between the polymer coils and the graphene oxide forms a 3D network, causing the gelation with the increasing polymer concentration. By using a freeze-drying process, the resulting graphene oxide/ polymer aerogel can be obtained that shows interesting properties to be used as electrochemical capacitor electrode.
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Submitted on : Tuesday, June 22, 2021 - 4:44:09 PM
Last modification on : Tuesday, September 7, 2021 - 3:28:36 AM
Long-term archiving on: : Thursday, September 23, 2021 - 7:00:18 PM

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  • HAL Id : tel-03267820, version 1

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Ying Huo. Etude de la stabilisation par du PVA de solutions aqueuses de graphène et de graphène oxydé et caractérisation des performances du composite graphène/graphène oxydé - PVA. Autre. Université de Lyon, 2021. Français. ⟨NNT : 2021LYSEC007⟩. ⟨tel-03267820⟩

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