期刊
CARBON
卷 162, 期 -, 页码 545-551出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.02.067
关键词
Auxetic materials; Negetive Poisson's ratio; Porous graphene film; Prediction of tunable Poisson's ratio
资金
- 2018 National Key R&D Program of China [257]
- National Natural Science Foundation of China [51372186, 51672204, 51701146, 11902232]
- Fundamental Research Funds for the Central Universities [WUT: 2017III055, 2018III039GX, 2018IVA095, 2018IB013, 193114005]
- National High-tech R&D Program (863 Program) of China [2013AA031306]
- NERC [NE/R013349/1, NE/R013349/2] Funding Source: UKRI
Auxetic materials with negative Poisson's ratios unusually exhibit intuitive mechanical behaviors, such as cross-section expansion instead of contraction during tension. Such behaviors are interesting because they may enhance unusual mechanical properties. However, controllable preparation of materials with negative Poisson's ratio is still a major challenge. In this study, we report the synthesis of a flexible auxetic graphene assembled macrofilm (GAMF) from graphene oxide nanosheets by a thermal annealing and press assistant method. The obtained materials exhibit good flexibility and significantly wide tunable negative Poisson's ratios ranging from -0.11 to -0.53. We also develop a reconstruction model for characterization the uniaxial tension of GAMF based on X-ray tomographic images. The tensile simulation result predicts the function relationship between Poisson's ratio and critical thickness of pore channels, which is in good agreement with the experimental data. As a result, an effective tunable way is proposed for customizable fabrication of GAMF with tunable negative Poisson's ratios, and the GAMF materials with good flexibility, high electrical conductivity and superior auxetic behavior looks promising for future development of wearable electronics. (C) 2020 Elsevier Ltd. All rights reserved.
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