Jump to main content
Jump to site search

Issue 28, 2017
Previous Article Next Article

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

Author affiliations

Abstract

High-k polymer composites are promising candidates for energy-storage capacitors and many other electronic devices. However, balancing 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 contrasting parameters of permittivity and loss. The introduction of negative-k layers into trilayered composites leads to a higher dielectric constant (ε′ ≈ 90@10 kHz) and low retained loss (tan δ ≈ 0.025@10 kHz) compared with those of the pristine PVDF (ε′ ≈ 10@10 kHz, tan δ ≈ 0.020@10 kHz). Moreover, the trilayered composites possess an obviously improved energy-storage capacity which is nearly 3 times higher than those of traditional trilayered composites without negative-k layers. Although the permittivity boost effect is still far below the theoretically predicted results and the mechanisms need 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.

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

Back to tab navigation

Supplementary files

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, 2017,5, 14575-14582
  •   Request permissions

    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. Yang, C. Zhang and R. Fan, J. Mater. Chem. A, 2017, 5, 14575
    DOI: 10.1039/C7TA03403B

Search articles by author

Spotlight

Advertisements