Graphene has been regarded as a promising candidate in microwave absorption field but still faces some major challenges, including the limitation of mass production and poor impedance matching. Here, we demonstrate a simple approach to fabricate multilayer graphene in a kilo-mass/hour (≥2.5 kg/h) scale through an oxidation-thermal expansion-air convection shearing process. The subsequent incorporation of hexagonal boron nitride nanoparticles (h-BNNPs) can effectively tailor the dielectric and magnetic properties of the as-obtained multilayer graphene, which can significantly boost its microwave absorption performance. The as-obtained multilayer graphene/h-BNNP hybrid with 40 wt.% of h-BNNPs, exhibits extremely low reflection loss value of −67.35 dB at 8.04 GHz when the absorber thickness is 3.29 mm, ranking it as one of the most attractive absorbers reported to date. Moreover, the multilayer graphene/h-BNNP hybrids possess low densities less than 0.45 g/cm³, making them very attractive for practical microwave absorption application.

石墨烯被认为是微波吸收领域中有希望的候选者，但仍面临一些重大挑战，包括批量生产的局限性和不良的阻抗匹配。在这里，我们演示了一种通过氧化-热膨胀-空气对流剪切工艺以千克质量/小时（≥2.5 kg / h）规模制造多层石墨烯的简单方法。随后掺入六方氮化硼纳米粒子（h -BNNPs）可以有效地调整所获得的多层石墨烯的介电和磁性能，这可以显着提高其微波吸收性能。所获得的多层石墨烯/ h- BNNP杂化物具有40 wt。％的h当吸收器厚度为3.29 mm时，-BNNPs在8.04 GHz处的反射损耗值非常低，为−67.35 dB，是迄今为止报道的最有吸引力的吸收器之一。此外，多层石墨烯/ h- BNNP杂化物具有小于0.45g / cm ^3的低密度，使其对于实际的微波吸收应用非常有吸引力。