Preparation Of Fe₃S₄ Nanaosheets And Study Of Their Electromagnetic Wave Absorption Properties

With the continuous innovation and development of science and technology in the world,many kinds of digital and high-frequency electronic devices get rapid development,which not only improve people's lives, but also bring more and more serious electromagnetic interference and electromagnetic pollution. Electromagnetic wave absorbing materials can reduce electromagnetic interference and electromagnetic pollution. In addition,electromagnetic wave absorbing materials are the key to achieve the stealth technology. The traditional electromagnetic wave absorbing materials are limited to the large density and narrow effective absorption bandwidth. The larger specific surface area, high proportion of surface atomic and more danglings bonds of nanomaterials make it have the characteristics of wide frequency bandwidth, thin thickness, strong absorption and light weight and so on.Therefore, nanomaterials become the research focus of the electromagnetic wave absorbing materials. Fe3S4 nanomaterials are concerned widely by people because of their special performance, and many research about lithium ion batteries, hydrogen storage, and medicine aspects have been reported. However,there are seldom reports in the electromagnetic wave absorption. On the other hand, the metal sulfide as electromagnetic wave absorbing material has made some progress. However, there are some problems such as a large amount of added in the matrix, the smaller absorption rate and effective absorption bandwidth. Therefore, this paper intends to synthesize Fe3S4 nanosheets to improve the absorption rate and the effective absorption bandwidth, and reduce the amount of added in the matrix. The main research contents are as follows:At first,Fe3S4 nanosheets were fabricated by a simple and high-efficiency solvothermal method. Then,the structure and morphology of Fe3S4 nanosheets were analyzed by X-ray diffraction, scanning electronic microscope, X-ray photoelectron spectroscopy and specific surface area analyzer. The magnetic properties of Fe3S4 nanosheets were measured by vibrating sample magnetometer, and the results showed that the Fe3S4 nanosheets exhibited ferromagnetism properties.The samples used for the electromagnetic wave measurement were fabricated by mixing 30wt% of the Fe3S4 nanosheets with a paraffin matrix. Then, the electromagnetic parameters were analyzed by the vector network analyzer. The reflection loss of the composites with different thickness were calculated. The results showed that the minimum reflection loss value was up to -43.18 dB at 10.48 GHz with the thickness of 2.4 mm and the effective absorption bandwidth less than -10 dB was 4.6 GHz (from 8.72 to 13.32 GHz). At the same time, the reflection loss minimum value reached -25 dB with the thickness of 2-5 nm. In additon, the addition amount of the Fe3S4 nanosheets in the matrix relatively small. All of the above results indicated that 30 wt% loading Fe3S4 nanosheets/paraffin composites had excellent electromagnetic wave absorption properties. Therefore, Fe3S4 nanosheets had better application prospects in the field of electromagnetic wave absorption.The three-dimensional map of the reflection loss of 30 wt% loading Fe3S4 nanosheets/paraffin composites was drawn by MATLAB software. Finally, the electromagnetic wave absorption mechanism of 30 wt% loading Fe3S4 nanosheets/paraffin composites was researched,and the effects of electromagnetic wave absorption properties addition amount of the Fe3S4 nanosheets in Fe3S4 nanosheets/paraffin composites was researched.