Preparation method of composite wave-absorbing aerogel, composite wave-absorbing aerogel and wave-absorbing device

Abstract

According to the preparation method of the composite wave-absorbing aerogel provided by the embodiment of the invention, the MAPbI3 / Ti3C2Tx composite wave-absorbing aerogel is obtained from a prepared perovskite precursor solution and Ti3C2Tx aerogel through a greenhouse recrystallization method. The MAPbI3 crystals can be distributed in pores or on the outer surface of the Ti3C2Tx aerogel, and the Ti3C2Tx aerogel has relatively high conductivity and can generate conductive loss. The MAPbI3 can be used as a polarization center for leading dielectric polarization loss. After the two are combined, due to different dielectric properties, formed multiple interfaces can generate interface polarization loss, and the different loss mechanisms cooperate with each other, so that the composite wave-absorbing aerogel has a relatively good absorption effect on electromagnetic waves within a relatively wide frequency range. In addition, the MAPbI3 can properly reduce the overall conductivity, so that the impedance matching of the composite wave-absorbing aerogel is optimized. Good impedance matching enables electromagnetic waves to enter the composite wave-absorbing aerogel more effectively, so that the electromagnetic waves can be fully absorbed and loss is generated.

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