Preparation method of interface polarization enhanced TiO2/RGO wave-absorbing material

Abstract

The invention provides a preparation method of an interface polarization enhanced TiO2 / RGO wave-absorbing material, which is specifically implemented according to the following steps: step 1, dispersing GO in a mixed solution of ethanol and water through ultrasonic treatment to obtain a GO suspension, then adding a mixed solution of tetrabutyl titanate and ethanol, and magnetically stirring to obtain a uniformly mixed solution; step 2, putting the uniformly mixed solution in the step 1 into a polytetrafluoroethylene-lined autoclave, and preparing a solid-phase product in a high-temperature state; step 3, washing the solid-phase product with ethanol and water in sequence, and then performing vacuum drying to obtain a TiO2 / GO nano composite material; and step 4, placing the TiO2 / GO nano composite material in a tubular furnace, and introducing reducing gas into the tubular furnace for heat treatment to obtain the TiO2 / GO nano composite material. According to the preparation method, an amorphous interface layer with a nanoscale thickness is formed on the surface of the TiO2 nano-particles through hydrogen atmosphere heat treatment, so that a nano heterogeneous interface is formed, and the dielectric loss performance of the TiO2 nano-particles is remarkably enhanced.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of wave-absorbing materials, and in particular relates to an interface polarization-enhanced TiO 2 / The preparation method of RGO absorbing material. Background technique [0002] With the wide application of wireless communication equipment, the accompanying electromagnetic pollution has become more and more serious, seriously affecting communication, equipment safety and human health, and has become an important problem that needs to be solved urgently. Absorbing material is a material that can convert electromagnetic wave energy into other forms of energy and reduce the reflection of electromagnetic energy. Electromagnetic wave absorbing materials should have performance requirements such as strong absorption capacity, wide absorption frequency band, thin thickness, low density, and stable performance. Traditional absorbing materials such as ferrite and carbon-based absorbers are...

AI Technical Summary

Problems solved by technology

The current application of carbon-based absorbing materials faces several problems: first, carbon nano-absorbing materials such as CNTs are prone to agglomeration, and their dispersion in the matrix is ​​a major problem; second, due to the high electrical conductivity of carbon materials, the loss capacity Very strong, it is easy to form a conductive channel when it reaches the percolation threshold, which is often not conducive to meeting the requirements of impedance matching, and puts forward very high requirements on the composition ratio of the absorber

The electrical conductivity of the dielectric loss material is much lower than that of the conductor material. There are almost no free electrons in the material, and no macroscopic current will be formed in the material under the action of an external electric field. Therefore, impedance mismatch is generally not caused, but the dielectric loss capability is generally not strong. Moreover, a large filling rate is required to achieve the ideal absorbing performance, which is not conducive to reducing the density of the absorbing material, and there is still room for further optimization of the performance

[0004] Absorbing materials with a single loss mechanism have shortcomings such as low absorption strength, narrow absorption frequency band, poor impedance characteristics, and high filling ratio, which limit their practical applications.

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