Microwave absorption materials with high reflection loss (RL), thin thickness and wide absorption bandwidth have attached a lot of attention for overcoming microwave pollution. Nanocomposites composed of carbon-based materials and metal sulfide have excellent microwave absorption properties, which meet the high RL of low weight microwave absorbing materials. In this study, binary nanocomposites of spherical-like nickel sulfide (NiS₂) decorated on reduced graphene oxide (rGO) were successfully prepared using a one-step single-mode microwave-assisted hydrothermal method. Morphological analysis using scanning electron microscopy and transmission electron microscopy indicated that the NiS₂ particles were evenly wrapped by rGO. The rGO/NiS₂ nanocomposites were used as microwave absorption materials and their electromagnetic parameters were measured in the range of 1.0–18.0 GHz. For the rGO/NiS₂ 1:5 nanocomposite with a very thin thickness of 1.59 mm, the minimum RL and effective absorption bandwidth reached −33.72 dB and 4.37 GHz, respectively. The microwave absorption performance of the nanocomposites improved by adjusting the impedance upon changing the mass fraction of NiS₂. Therefore, rGO/NiS₂ nanocomposites with high RL and thin thickness have great application prospects for microwave absorption.

具有高反射损耗（RL）、薄厚度和宽吸收带宽的微波吸收材料在克服微波污染方面备受关注。由碳基材料和金属硫化物组成的纳米复合材料具有优异的吸波性能，满足低重量吸波材料的高RL。在这项研究中，使用一步单模微波辅助水热法成功制备了装饰在还原氧化石墨烯 (rGO) 上的球形硫化镍 (NiS ₂ )二元纳米复合材料。使用扫描电子显微镜和透射电子显微镜的形态学分析表明，NiS ₂颗粒被rGO均匀包裹。rGO/NiS ₂纳米复合材料用作微波吸收材料，其电磁参数在 1.0-18.0 GHz 范围内测量。对于厚度为 1.59 mm 的非常薄的 rGO/NiS ₂ 1:5 纳米复合材料，最小 RL 和有效吸收带宽分别达到 -33.72 dB 和 4.37 GHz。通过改变NiS ₂的质量分数来调节阻抗，纳米复合材料的微波吸收性能得到改善。因此，具有高RL和薄厚度的rGO/NiS ₂纳米复合材料在微波吸收方面具有很大的应用前景。