Abstract
Systematic investigations on the dielectric properties of multi-walled carbon nanotubes (MWNTs)-polyvinylidene fluoride (PVDF) composites with a wide MWNT concentration range (2 - 9 wt%) have been carried out. It is revealed that the dielectric constant is increased by the addition of an appropriate amount of MWNTs at room temperature. However, when the concentration of MWNTs in the composites reaches above 5 wt%, negative dielectric constants and large dielectric loss in the composites are observed in the low frequency range. The ferroelectric CNT-PVDF polymer composites containing more than 5 wt% MWNTs have a strong dielectric absorption, which has the potential for acoustic applications.
Highlights
The inclusion of nanoscale subjects in a matrix material such as polymers can lead to substantial enhancement in selected physical properties relative to the pristine material
When the concentration of multi-walled carbon nanotubes (MWNTs) in the composites reaches above 5 wt%, negative dielectric constants and large dielectric loss in the composites are observed in the low frequency range
The ferroelectric Carbon nanotube (CNT)-polyvinylidene fluoride (PVDF) polymer composites containing more than 5 wt% MWNTs have a strong dielectric absorption, which has the potential for acoustic applications
Summary
The inclusion of nanoscale subjects in a matrix material such as polymers can lead to substantial enhancement in selected physical properties relative to the pristine material. Carbon nanotube (CNT) has attracted intensive interest due to their nanometer-scale dimension as well as their large shape anisotropy and unique mechanical, thermal, and electrical properties [1, 2]. Because of their large dielectric constant, electrically conductive carbon nanotubes are attractive as fillers for high dielectric-constant nanocomposites. The dielectric properties of CNT-PVDF composites can be tailored to suit particular performance requirements for some special applications [7,8,9,10]. The results include the observations of negative dielectric constants and large dielectric loss in the composites, especially in low frequency region
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