RGO/CBNNTs复合材料的设计及微波吸收性能

Preparation and microwave absorption properties of RGO/CBNNTs composite

摘要

以氧化石墨烯（GO）作为基底材料，MgCl₂ 为催化剂，在 N₂ 与 NH₃ 的混合气氛下，利用化学气相沉积法将 GO 转化成还原氧化石墨烯（RGO），同时在其表面生长崩溃型氮化硼纳米管（CBNNTs）合成 RGO/CBNNTs 复合材料。通过控制反应温度（800、850、900 ℃）可有效地抑制副产物 MgF₂ 的生成并控制 CBNNTs 管壁内径的生长，进而制备出三种 RGO/CBNNTs 复合材料。通过对 RGO 表面负载不同管径的 CBNNTs，考察 RGO/CBNNTs 复合材料在 2～18 GHz 频段内的吸波性能。其中 RGO/CBNNTs-900 的吸波性能最佳，根据测试数据可知，在 13.36 GHz 处 RGO/CBNNTs-900 的最小反射损耗（RL_min）达到−49.17 dB，匹配厚度仅为 1.59 mm，上述各项参数均强于 RGO。由于 RGO 的电导率较高且介电常数较大，极其容易引起电磁阻抗失配问题。而 CBNNTs 的引入将 RGO 的ε′从 7.7 降低到 5.1，缓解 RGO 电导率较高、介电常数较大的问题，提升微波吸收性能，此方法为 RGO 材料在微波吸收领域的应用提供新的思路。

Abstract

Graphene oxide (GO) is used as the substrate material and MgCl₂ is used as the catalyst. Under a mixed atmosphere of N₂ and NH₃，GO is converted into reduced graphene oxide (RGO) by chemical vapor deposition. Meanwhile，collapse boron nitride nanotubes (CBNNTs) are grown on its surface to synthesize RGO/CBNNTs composite materials. By controlling the reaction temperature (800，850，900 ℃)，the generation of by-product MgF₂ can be effectively inhibited and the growth of the inner diameter of CBNNTs tube wall can be controlled，thereby preparing three types of RGO/CBNNTs composite materials. The wave absorption performance of RGO/CBNNTs composite in the 2-18 GHz frequency band is investigated by attaching CBNNTs of different pipe diameters to the surface of RGO. Among them，the absorption performance of RGO/ CBNTS-900 is the best. According to the test data，at 13.36 GHz，the minimum reflection loss (RL_min) of RGO/ CBNTS-900 reaches −49.17 dB，and the matching thickness is only 1.59 mm. All the above parameters are stronger than those of RGO. Due to the high electrical conductivity and large dielectric constant of RGO，it is extremely prone to causing electromagnetic impedance mismatch problems. The introduction of CBNNTs has reduced the ε' of RGO from 7.7 to 5.1，alleviating the problems of high electrical conductivity and large dielectric constant of RGO，and improving the microwave absorption performance. This method provides a new idea for the application of RGO materials in the field of microwave absorption.

关键词

还原氧化石墨烯 / 崩溃型氮化硼纳米管 / 化学气相沉积法 / 微波吸收性能

Key words

reduced graphene oxide / collapsed boron nitride nanotube / chemical vapor deposition / microwave absorption performance

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基金资助

天津市教委高等教育科技发展基金(2023KJ244)