Nanometer composite material with high dielectric constant and low conductivity

Abstract

The invention belongs to the field of a dielectric composite material and relates to a new method for preparing a nanometer composite material film with high dielectric constant and low conductivity.A dielectric material has wide application in the field of microelectronics, such as a bypass capacitor, an organic field effect transistor, an organic thin layer electroluminescent device, electric field control and an electric energy storage device, but obtaining a material with high dielectric constant, extremely low conductivity and low dielectric loss is still a technical problem. The nanometer composite material film is prepared by combining small-size graphene and aromatic organic micromolecules and filling into a polymer, has high dielectric constant of 10<4> order magnitude and low conductivity of 10<-8> order magnitude, effectively propels the application range of the dielectric material and improves the properties of the material. Organic micromolecules are adsorbed on the surface of the graphene, so that the stacking of graphene sheets and the formation of a conductive network are hindered, and the conductivity can be inhibited while the conductivity of the composite material is improved. The material is simple to form, excellent in performance and favorable for industrialized production.

Description

Technical field: [0001] The invention belongs to the field of dielectric composite materials, and specifically relates to a nano composite material with high dielectric constant and low conductivity prepared by using small-size graphene, aromatic organic small molecules, and polyvinylidene fluoride, which can be used for thin films Type capacitor to improve energy density. Background technique: [0002] High dielectric materials have very important applications in the electronics and motor industries, especially in high energy storage capacitors. The formula for calculating the electric energy stored by the capacitor is W=CV 2 / 2, where the capacitance C is proportional to the dielectric constant of the capacitor, so the energy storage capacity of a capacitor with a certain size under the same voltage V is determined by the dielectric constant of the capacitor. [0003] The role of high dielectric constant materials in energy storage and electric field homogenization makes it of g...

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Problems solved by technology

However, the reduced graphene is easy to attract each other and then stacked into graphite sheets, and the oxygen-containing functional groups are not completely removed, resulting in low conductivity. These are not conducive to the application of graphene in high dielectric and low conductivity composite films.

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