Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies

Dispersion and spatial distribution of graphene sheets play crucial roles in tailoring mechanical and functional properties of their polymer composites. Anisotropic graphene aerogels (AGAs) with highly aligned graphene networks are prepared by a directional-freezing followed by freeze-drying process...

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Main Authors: Li, Xing-Hua, Li, Xiaofeng, Liao, Kai-Ning, Min, Peng, Liu, Tao, Dasari, Aravind, Yu, Zhong-Zhen
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/85721
http://hdl.handle.net/10220/43806
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-857212023-07-14T15:51:19Z Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies Li, Xing-Hua Li, Xiaofeng Liao, Kai-Ning Min, Peng Liu, Tao Dasari, Aravind Yu, Zhong-Zhen School of Materials Science & Engineering Anisotropic graphene aerogel Electromagnetic interference shielding Dispersion and spatial distribution of graphene sheets play crucial roles in tailoring mechanical and functional properties of their polymer composites. Anisotropic graphene aerogels (AGAs) with highly aligned graphene networks are prepared by a directional-freezing followed by freeze-drying process and exhibit different microstructures and performances along the axial (freezing direction) and radial (perpendicular to the axial direction) directions. Thermal annealing at 1300 °C significantly enhances the quality of both AGAs and conventional graphene aerogels (GAs). The aligned graphene/epoxy composites show highly anisotropic mechanical and electrical properties and excellent electromagnetic interference (EMI) shielding efficiencies at very low graphene loadings. Compared to the epoxy composite with 0.8 wt % thermally annealed GAs (TGAs) with an EMI shielding effectiveness of 27 dB, the aligned graphene/epoxy composite with 0.8 wt % thermally treated AGAs (TAGAs) has an enhanced EMI shielding effectiveness of 32 dB along the radial direction with a slightly decreased shielding effectiveness of 25 dB along the axial direction. With 0.2 wt % TAGA, its epoxy composite exhibits a shielding effectiveness of 25 dB along the radial direction, which meets the requirement of ∼20 dB for practical EMI shielding applications. Accepted version 2017-09-27T04:08:04Z 2019-12-06T16:09:02Z 2017-09-27T04:08:04Z 2019-12-06T16:09:02Z 2016 Journal Article Li, X.-H., Li, X., Liao, K.-N., Min, P., Liu, T., Dasari, A., et al. (2016). Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies. ACS Applied Materials & Interfaces, 8(48), 33230-33239. 1944-8244 https://hdl.handle.net/10356/85721 http://hdl.handle.net/10220/43806 10.1021/acsami.6b12295 en ACS Applied Materials & Interfaces © 2016 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Applied Materials & Interfaces, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/acsami.6b12295]. 33 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Anisotropic graphene aerogel
Electromagnetic interference shielding
spellingShingle Anisotropic graphene aerogel
Electromagnetic interference shielding
Li, Xing-Hua
Li, Xiaofeng
Liao, Kai-Ning
Min, Peng
Liu, Tao
Dasari, Aravind
Yu, Zhong-Zhen
Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies
description Dispersion and spatial distribution of graphene sheets play crucial roles in tailoring mechanical and functional properties of their polymer composites. Anisotropic graphene aerogels (AGAs) with highly aligned graphene networks are prepared by a directional-freezing followed by freeze-drying process and exhibit different microstructures and performances along the axial (freezing direction) and radial (perpendicular to the axial direction) directions. Thermal annealing at 1300 °C significantly enhances the quality of both AGAs and conventional graphene aerogels (GAs). The aligned graphene/epoxy composites show highly anisotropic mechanical and electrical properties and excellent electromagnetic interference (EMI) shielding efficiencies at very low graphene loadings. Compared to the epoxy composite with 0.8 wt % thermally annealed GAs (TGAs) with an EMI shielding effectiveness of 27 dB, the aligned graphene/epoxy composite with 0.8 wt % thermally treated AGAs (TAGAs) has an enhanced EMI shielding effectiveness of 32 dB along the radial direction with a slightly decreased shielding effectiveness of 25 dB along the axial direction. With 0.2 wt % TAGA, its epoxy composite exhibits a shielding effectiveness of 25 dB along the radial direction, which meets the requirement of ∼20 dB for practical EMI shielding applications.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Li, Xing-Hua
Li, Xiaofeng
Liao, Kai-Ning
Min, Peng
Liu, Tao
Dasari, Aravind
Yu, Zhong-Zhen
format Article
author Li, Xing-Hua
Li, Xiaofeng
Liao, Kai-Ning
Min, Peng
Liu, Tao
Dasari, Aravind
Yu, Zhong-Zhen
author_sort Li, Xing-Hua
title Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies
title_short Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies
title_full Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies
title_fullStr Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies
title_full_unstemmed Thermally Annealed Anisotropic Graphene Aerogels and Their Electrically Conductive Epoxy Composites with Excellent Electromagnetic Interference Shielding Efficiencies
title_sort thermally annealed anisotropic graphene aerogels and their electrically conductive epoxy composites with excellent electromagnetic interference shielding efficiencies
publishDate 2017
url https://hdl.handle.net/10356/85721
http://hdl.handle.net/10220/43806
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