Hydroiodic acid and microwave reduced graphene oxide/PES-C films for flexible EMI shielding materials

Due to the increasing demand for portability of electronic devices in society, flexible and lightweight shielding materials have received greater attention. There is an urgent need for ultra-thin, flexible, and highly conductive materials with excellent electromagnetic interference shielding performance, especially for the preparation of stretchable shielding materials in practical applications such as wearable and foldable electronics. Herein, the microwave and hydroiodic acid reduced graphene oxide (M-HIRGO) was obtained through the combination of the two reduction methods. Three-layer and five-layer M-HIRGO/PES-C composite films with sandwich structure were prepared in the form of PES-C|RGO|PES-C laminates. In the five-layer structure, the electromagnetic shielding of M-HIRGO/PES-C composite film with a middle PES-C layer thickness of 122 mu m in the X-band was 46.73 dB. And the shielding mechanism is mainly due to absorption. Meanwhile, the obtained M-HIRGO/PES-C composite films had a tensile strength of 23.43 MPa. This study may provide a simple and effective approach to achieve new EMI shielding materials, especially for absorption-dominated EMI shielding.