Deformation and failure mechanisms in graphene oxide paper using in situ nanomechanical tensile testing |
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| Affiliation: | 1. Department of Materials, School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK;2. Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK;3. National Center for Nanoscience and Technology, Beijing 100190, PR China;1. Department of Automation, Biomechanics and Mechatronics, Lodz University of Technology, 1/15 Stefanowski St., 90-924 Lodz, Poland;2. Department of Vehicles, Warsaw University of Technology, 84 Narbutta St., 02-524 Warsaw, Poland;3. Department of Higher Mathematics and Mechanics, Engels Institute of Technology (Branch), Saratov State Technical University, Saratov Region, Ploschad Svobodi 17, 413100 Engels, Russian Federation;4. Department of Mathematics and Modeling, Saratov State Technical University, Politehnicheskaya 77, 410054 Saratov, Russian Federation;1. College of Engineering, Temple University, 1947 North 12th Street, Philadelphia, PA 19122, USA;2. Shriners Hospitals for Children–Philadelphia, 3551 North Broad Street, Philadelphia, PA 19140, USA;1. Institute of Mechanics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany;2. Department of Civil, Environmental and Geo- Engineering, University of Minnesota, 500 Pillsbury Drive S.E., Minneapolis, MN 55455, USA;1. Department of Research and Innovation, Shenzhen Institute of Building Research Co., Ltd., Shenzhen 518049, China;2. Department of Engineering Mechanics, School of Civil Engineering, Wuhan University, Wuhan 430072, China;3. Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan |
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| Abstract: | Graphene oxide (GO) paper is a promising candidate for novel applications in energy storage systems such as electrical batteries, supercapacitors and multi-layered composites where the material undergoes deformation mechanisms. In particular, the strength of graphene oxide paper is critical in such applications and is defined by the interaction between the GO sheet constituents of the paper. The deformation behavior and tensile strength of focused ion beam (FIB) fabricated GO micro-beams was measured using in situ atomic force microscopy (AFM). GO sample deformation and failure was dependent on both the size of the micro-beams and the environmental testing conditions. Specifically, the failure stress of GO paper micro-beams tensile tested in air was found to increase when compared to testing in vacuum. This environmental dependent tensile strength of GO paper is attributed to water promoting stress transfer between GO sheets within the paper for higher strength during air testing while vacuum conditions remove water, leading to poor stress transfer between GO sheets for lower tensile strength results. A two-parameter Weibull distribution is introduced to quantify the micro-beam size dependent strength, which is attributed to interfacial defects determining GO paper failure strength. |
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