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Significantly improved dielectric performances of sandwich-structured polymer composites induced by alternating positive-k and negative-k layers

Abstract

High-k polymer composites are promising candidates for energy-storage capacitors and many other electronic devices. However, how to balance the permittivity, loss and breakdown strength remains a challenge for us. Herein, theoretical calculations and experimental studies were simultaneously carried out to develop an original design of sandwich-structured composites consisting of alternating negative-k and positive-k layers toward high performance dielectric applications. It is experimentally proved that the trilayered composites are capable of balancing the two contradict parameters: permittivity and loss. The introduction of negative-k layers into trilayered composites leads to higher dielectric constant (ε′ ≈ 90 @10 kHz) and retained low loss (tanδ ≈ 0.025 @10 kHz) compared with the pristine PVDF (ε′ ≈ 10 @10 kHz, tanδ ≈ 0.020 @10 kHz). Moreover, the trilayered composites possess an obviously improved energy-storage capacity which is nearly 3 times higher than traditional trilayered composites without negative-k layers. Although the permittivity boost effect is still far below the theoretically predicted results and the mechanisms needs to be further clarified, these results undoubtedly validated the feasibility of our design, and multilayer high-k composites with fascinating dielectric performances are expected to emerge in the near future via tailoring the properties of single-layers and stacking sequences.

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Publication details

The article was received on 19 Apr 2017, accepted on 17 Jun 2017 and first published on 17 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03403B
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Significantly improved dielectric performances of sandwich-structured polymer composites induced by alternating positive-k and negative-k layers

    Z. Shi, J. Wang, F. Mao, C. Q. Yang, C. Zhang and R. Fan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03403B

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