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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Multifunctional Ti3C2Tx MXene/boron nitride nanosheet/polydimethylsiloxane nanocomposites with integrated dielectric
Zifu Zhu1,2, Dan Liu1,2, Jie Xue1,2
1School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, 518172, Guangdong, P.R. China. zhengqingbin@cuhk.edu.cn.
None:
Driven by accelerated innovations in integrated microelectronics, dielectric nanocomposites with an integrated high dielectric constant, low dielectric loss and high electromagnetic interference (EMI) shielding effectiveness (SE) have emerged as pivotal materials for next-generation electronic devices. Herein, multifunctional Ti3C2Tx MXene/boron nitride nanosheet (BNNS)/polydimethylsiloxane (PDMS) nanocomposites with highly anisotropic structures are developed through oriented assembly of two-dimensional Ti3C2Tx MXene and BNNSs via a unidirectional freeze-casting strategy. Owing to the highly oriented Ti3C2Tx MXene/BNNS skeletons, the Ti3C2Tx MXene/BNNS/PDMS nanocomposites exhibit excellent dielectric performance with a high dielectric constant (ε) of 31.8 coupled with a remarkably low dielectric loss (tan δ) of 2.8 × 10-3, yielding an unprecedented dielectric constant to loss ratio of 104. Moreover, the oriented porous structure of Ti3C2Tx MXene/BNNS aerogel endows the Ti3C2Tx MXene/BNNS/PDMS nanocomposite with an exceptional EMI SE value of 39.9 dB across the X-band frequency range (8.2-12.4 GHz). The synergistic design provides a facile strategy to produce next-generation electronic systems requiring concurrent energy storage and electromagnetic compatibility.
