Abstract In this work, we first screen print thin GO laminates on Kapton film and then chemically reduce to rGO with desired sheet resistance by controlling printing cycles and reduction time. The thin rGO laminates have a wide range of conductivity from 2.8 S m−1 up to 1.3 × 104 S m−1, exhibiting excellent consistency of electric performance even after 50000 times bending. Commonly used rGO reduction level characterization methods have been compared with the proposed sheet resistance method. It is revealed that the later has higher variation with reduction time, providing a new method for reduction monitoring of rGO. Benefiting from the tunability of its sheet resistance, the rGO laminate not only can be used in flexible electronic circuits as conductors or resistors, but also highly efficient to absorb microwave radiations with proper design. Therefore, a printed, three-layer, Jaumann structured microwave absorber has been designed, fabricated and characterised. The maximum microwave absorption rate is up to 99.9997% where the −10 dB fractional bandwidth is over 153%, which covers L, S and C bands. Moreover, the fabricated absorber can absorb efficiently even when the incident angle is as low as 20°. Full design procedure, simulation and measurement results are presented.

中文翻译：

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氧化石墨烯层压板的可控还原及其在超宽带微波吸收中的应用

摘要 在这项工作中，我们首先在 Kapton 膜上丝网印刷薄的 GO 层压板，然后通过控制印刷周期和还原时间化学还原为具有所需薄层电阻的 rGO。薄的 rGO 层压板具有从 2.8 S m-1 到 1.3 × 104 S m-1 的广泛电导率，即使在 50000 次弯曲后也表现出优异的电性能一致性。常用的 rGO 还原水平表征方法已与提议的薄层电阻方法进行了比较。结果表明，后者随还原时间变化较大，为rGO还原监测提供了一种新方法。得益于其薄层电阻的可调性，rGO 层压板不仅可以用作柔性电子电路中的导体或电阻器，而且通过适当的设计还可以高效地吸收微波辐射。因此，已经设计、制造和表征了印刷的三层 Jaumann 结构微波吸收器。最大微波吸收率高达 99.9997%，其中 -10 dB 部分带宽超过 153%，覆盖 L、S 和 C 频段。此外，即使入射角低至 20°，制造的吸收体也能有效吸收。提供了完整的设计程序、仿真和测量结果。