摘要
通过原位聚合法和高温碳化法合成了Fe3O4@SiO2@C核壳纳米粒子。使用傅里叶红外光谱仪、透射电子显微镜和矢量网络分析仪表征了所制备的样品。结果表明,纳米粒子呈现致密的核壳结构,平均粒径在700 nm左右,C层的厚度约为55 nm。此外,吸收体厚度为2 mm时,在12~16 GHz范围内,样品的微波反射损耗低于−10 dB,在13 GHz处达到最小值−21 dB。最后,利用时域有限差分法计算了Fe3O4@SiO2@C纳米粒子在红外波段的吸收、散射和消光效率,结果表明纳米粒子具有纯碳优良的红外消光性能。因此,Fe3O4@SiO2@C纳米粒子可以作为一种红外干扰材料兼具雷达波吸收性能。
Fe3O4@SiO2@C hybrid nanoparticles were synthesized via in situ polymerization and high-temperature carbonization. Fourier Transform Infrared Spectroscopy, Transmission Electron Microscopy and Agilent Vector Network Analyzer were used to characterize the as-prepared samples. The results suggested that the nanoparticles presented dense core-shell structure with average particle size of nearly 700 nm and C layer thicknesses of 55 nm. Furthermore, the microwave absorption properties exhibited the microwave reflection loss lower than −10 dB over 12~16 GHz and reached the minimum value −21 dB at 13 GHz with an absorber of 2 mm thickness. In addition, the efficiency factors for absorption, scattering and extinction in IR of the Fe3O4@SiO2@C nanoparticles was calculated by the finite-difference time-domain method, which showed that the nanoparticles presented the extinction performance of pure carbon. Therefore, the high-performance Fe3O4@SiO2@C nanoparticles can be applied as a new infrared extinction and microwave absorption material.
出处
《材料科学》
CAS
2022年第3期209-218,共7页
Material Sciences
