期刊
CARBON
卷 67, 期 -, 页码 784-791出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.10.078
关键词
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资金
- China Scholarship Council (CSC, China)
- National 863 Plan Project of China [2012AA03A205]
- Innovation Foundation for Excellent Postgraduate of National University of Defense Technology [B110103]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2011B003]
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions and Science & Technology Project of Hunan Province [2011FJ1001]
Highly ordered polymer composites of layered graphene/graphene oxide (GO) sheets, i.e. graphene/GO paper, are attractive candidates for novel structural and functional applications. Here, molecular dynamics simulations are employed to elucidate the structural and mechanical properties of the graphene/GO paper based polymer composites. We find that the large scale properties of these composites are controlled by the conformation and content of polymer molecules within the interlayer galleries. Polymer conformations affect the interlayer spacing, while the polymer content controls the layer-matrix interactions, -thereby affecting the elastic modulus of the composites. Additionally, the chemical composition of individual GO sheets also plays a critical role in establishing the mechanical properties of the composites. Specifically, a higher density of oxygen-containing groups leads to the decrease of elastic modulus of individual GO sheets. However, the groups also lead to the increased hydrogen bonds between the GO sheets and polymer molecules, resulting in the corresponding increase in overall stiffness. Our studies suggest the possibility of tuning the properties of graphene/GO paper composites by altering the conformation and content of polymer, as well as the density of functional groups on individual GO sheets. (C) 2013 Elsevier Ltd. All rights reserved.
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