Journal
RESEARCH
Volume 2022, Issue -, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.34133/2022/9780290
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Funding
- Foundation of National Natural Science Foundation of China [51903145, 51973173]
- Natural Science Basic Research Plan for Distinguished Young Scholars in Shaanxi Province of China [2019JC-11]
- Fundamental Research Funds for the Central Universities [D5000210627]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX2021107]
- Polymer Electromagnetic Functional Materials Innovation Team of Shaanxi Sanqin Scholars
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In this study, a directional freeze-drying technology was used to prepare an aramid nanofiber/polyvinyl alcohol aerogel, which was then impregnated with Ti(3) C2T(x) dispersion and hot pressed to obtain a Ti(3) C2T(x)/(ANF/PVA) EMI shielding composite film with a directionally ordered structure. The composite film exhibited excellent shielding effectiveness and conductivity.
Multifunctional electromagnetic interference (EMI) shielding materials would solve electromagnetic radiation and pollution problems from electronic devices. Herein, the directional freeze-drying technology is utilized to prepare the aramid nanofiber/ polyvinyl alcohol aerogel with a directionally porous structure (D-ANF/PVA), and the Ti(3)C2T(x) dispersion is fully immersed into the D-ANF/PVA aerogel via ultrasonication and vacuum-assisted impregnation. Ti(3)C2T(x)/(ANF/PVA) EMI shielding composite films with directionally ordered structure (D-Ti3C2Tx/(ANF/PVA)) are then prepared by freeze-drying and hot pressing. Constructing a directionally porous structure enables the highly conductive Ti3C2Tx nanosheets to be wrapped on the directionally porous D-ANF/PVA framework in order arrangement and overlapped with each other. And the hot pressing process effectively reduces the layer spacing between the stacked wavy D-ANF/PVA, to form a large number of Ti3C2Tx-Ti3C2Tx continuous conductive paths, which significantly improves the conductivity of the D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film. When the amount of Ti3C2Tx is 80 wt%, the EMI shielding effectiveness (EMI SE) and specific SE (SSE/t) of D-Ti3C2Tx/(ANF/PVA) EMI shielding composite film achieve 70 dB and 13790 dB.cm(2).g(-)1 (thickness and density of 120 mu m and 0.423 g.cm(-3)), far superior to random-structured Ti3C2Tx/(ANF/PVA) (R-Ti3C2Tx/(ANF/PVA)) composite film (46 dB and 9062 dB.cm(2).g(-1), respectively) via blending-freeze-drying followed by hot pressing technology. Meanwhile, the DTi3C2Tx/(ANF/PVA) EMI shielding composite film possesses excellent flexibility and foldability.
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