The design and realization of graphene based wideband electromagnetic (EM) absorbing textiles are becoming of primary interest. Hence, the development of new conductive coatings to be cast onto commercial textiles is crucial. In this article, we propose new graphene based absorbing textiles that conjugate outstanding EM absorbing properties at radiofrequency with low-weight, flexibility, cost-effectiveness, and washability. With this purpose, an innovative production process of polyvinylidene fluoride (PVDF) coatings filled with graphene nanoplatelets (GNPs) is developed for the production of radar-absorbing coated textiles, which are fully characterized in terms of morphological, electrical, and EM absorbing properties. In particular, the complex dielectric permittivity of the coated textiles including different amounts of GNPs is assessed through the measurement of the complex permittivity of a benchmark sample, the consequent estimation of the average GNP size and the prediction by simulations of the effective complex permittivity of graphene based coatings loaded with different GNP amounts. Such predicted data are crucial to design radar absorbing textiles with minimum bandwidths at −10 dB of 5 GHz and reflection coefficients below −5 dB over all the frequency range from 8 up to 18 GHz. These textiles are then produced and characterized in terms of reflection coefficient in free space against a plane wave with normal incidence. The obtained results demonstrate the full satisfaction of the design requirements. In fact, the produced samples show a reflection coefficient with a bandwidth at −10 dB up to 77% of the resonant frequency.

中文翻译：

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基于石墨烯的微波波段宽带电磁吸波纺织品


基于石墨烯的宽带电磁（EM）吸收纺织品的设计和实现正成为人们关注的焦点。因此，开发用于商用纺织品的新型导电涂层至关重要。在本文中，我们提出了基于石墨烯的新型吸波纺织品，该纺织品将出色的射频电磁波吸收特性与轻质、柔韧性、成本效益和可洗性相结合。为此，开发了一种填充石墨烯纳米片（GNP）的聚偏二氟乙烯（PVDF）涂层的创新生产工艺，用于生产雷达吸收涂层纺织品，该纺织品在形态、电气和电磁吸收性能方面具有充分的特征。特别是，通过测量基准样品的复介电常数、随后估计平均 GNP 尺寸以及通过模拟石墨烯的有效复介电常数来预测包含不同量 GNP 的涂层纺织品的复介电常数。基于负载不同 GNP 量的涂料。这些预测数据对于设计雷达吸波织物至关重要，该织物在 5 GHz 的 −10 dB 处具有最小带宽，并且在 8 至 18 GHz 的所有频率范围内反射系数低于 −5 dB。然后生产这些纺织品，并根据自由空间中垂直入射平面波的反射系数来表征。所得结果表明完全满足设计要求。事实上，所生产的样品显示反射系数的带宽为 -10 dB，高达谐振频率的 77%。