Here, we report a facile hydrothermal synthesis method to prepare BiFeO₃ nanowire-reduced graphene oxide (BFO-RGO) nanocomposites. The unique properties of 2-D reduced graphene oxide (RGO) and 1-D BiFeO₃ nanowires (BFO) were exploited to design nanocomposites to obtain high performing microwave absorber materials. The composite with 97 wt % BFO and 3 wt % RGO exhibited minimum reflection loss value of −28.68 dB at 10.68 GHz along with the effective absorption bandwidth (≥ −10 dB) ranging from 9.6 to 11.7 GHz when the absorber thickness was only 1.55 mm. First-principles calculations based on density functional theory (DFT) of BFO, graphene, and BFO-RGO nanocomposites were performed to obtain information about their electronic structures to interpret their complex permittivity and its derived properties. To the best of our knowledge, this is the first time investigations on microwave absorption properties of the BiFeO₃ nanowire and BFO-RGO nanocomposites have been reported, and this nanocomposite shows its potential to be used as a lightweight, high performing microwave absorber in the X-band region.

中文翻译：

---

BiFeO ₃纳米线-RGO纳米复合材料的合成和微波吸收性能以及计算电磁性能和电子结构的第一性原理

在这里，我们报告了一种方便的水热合成方法来制备BiFeO ₃纳米线还原氧化石墨烯（BFO-RGO）纳米复合材料。二维还原氧化石墨烯（RGO）和一维BiFeO ₃的独特性能利用纳米线（BFO）设计纳米复合材料以获得高性能的微波吸收材料。当吸收体厚度仅为1.55 mm时，具有97 wt％BFO和3 wt％RGO的复合材料在10.68 GHz时表现出最小反射损耗值-28.68 dB，有效吸收带宽（≥-10 dB）在9.6至11.7 GHz之间。进行了基于BFO，石墨烯和BFO-RGO纳米复合材料的密度泛函理论（DFT）的第一性原理计算，以获得有关其电子结构的信息，以解释其复介电常数及其衍生性质。据我们所知，这是BiFeO ₃微波吸收特性的首次研究。 纳米线和BFO-RGO纳米复合材料已有报道，这种纳米复合材料显示出其在X波段区域用作轻质，高性能微波吸收剂的潜力。