Carbon Coated Boron Nitride Nanosheets for Polymer Nanocomposites with Enhanced Dielectric Performance.

Minhao Yang,Chaohe Hu,Hang Zhao,Haowei Chen,Jinbo Bai,Delong He

doi:10.3390/ma10070741

Abstract

Carbon coated boron nitride nanosheets (BNNSs@C) hybrids with different carbon contents were synthesized by a chemical vapor deposition (CVD) method. The content of carbon in as-obtained BNNSs@C hybrids could be precisely adjusted from 2.50% to 22.62% by controlling the carbon deposition time during the CVD procedure. Afterward, the BNNSs@C hybrids were subsequently incorporated into the polyvinylidene fluoride (PVDF) matrix to fabricate the BNNSs@C/PVDF nanocomposites through a combination of solution and melting blending methods. The dielectric properties of the as-obtained BNNSs@C/PVDF nanocomposites could be accurately tuned by adjusting the carbon content. The resultant nanocomposites could afford a high dielectric constant about 39 (103 Hz) at BNNSs@C hybrids loading of 30 vol %, which is 4.8 times larger than that of pristine BNNSs-filled ones at the same filler loading, and 3.5 times higher than that of pure PVDF matrix. The largely enhanced dielectric performance could be ascribed to the improved interfacial polarizations of BNNSs/carbon and carbon/PVDF interfaces. The approach reported here offers an effective and alternative method to fabricate high-performance dielectric nanocomposites, which could be potentially applied to the embedded capacitors with high dielectric performance.

Highlights

The tremendous advances in flexible electronic devices, pulsed-power electronic devices, and electric power systems have stimulated enormous research interests in the field of high dielectric constant materials [1,2,3,4,5,6,7,8,9,10]
The dielectric performances of the as-obtained boron nitride nanosheets (BNNSs)@C/polyvinylidene fluoride (PVDF) nanocomposites could be precisely controlled by tuning the carbon content in BNNSs@C hybrids
These results indicate that the dielectric performance of BNNSs@C/PVDF nanocomposites could be largely enhanced after depositing the carbon layer on the surface of BNNSs

Summary

Introduction

The tremendous advances in flexible electronic devices, pulsed-power electronic devices, and electric power systems have stimulated enormous research interests in the field of high dielectric constant materials [1,2,3,4,5,6,7,8,9,10]. The nanocomposites technology provides a promising strategy to achieve a high dielectric constant by incorporating the conductive fillers or inorganic ceramics into the polymer matrix. Nanocomposites, which affords a dielectric constant about 330.6 at 20 vol % filler loading [33] All these previous studies have confirmed that the core–shell structured hybrids with a conductive layer could endow the nanocomposites with an excellent dielectric property. The dielectric performances of the as-obtained BNNSs@C/PVDF nanocomposites could be precisely controlled by tuning the carbon content in BNNSs@C hybrids These results indicate that the dielectric performance of BNNSs@C/PVDF nanocomposites could be largely enhanced after depositing the carbon layer on the surface of BNNSs. The design concept here provides a new thought for the preparation of dielectric materials with the excellent dielectric performance, which makes them a prominent potential candidate in embedded capacitor industry

Experimental

Characterizations

Results and Discussion

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The nakedofsurface

Conclusions