Electromagnetic interference (EMI) can cause problems to electronic devices, equipment and systems. With the new generation of communications, especially the 5G technology, EMI shielding becomes more important and new challenges appear regarding EMI and the requirement of electromagnetic shielding, since, electromagnetically active devices must not affect the operation and the safety of other systems in their environment. The classical methods of shielding by using metallic plates or coating need to be improved, therefore, there it is a need for materials capable to provide dielectric characteristics at lower frequencies and conductive characteristics at high frequencies. With increasing frequencies and further miniaturization of devices, EMI shielding is key to this new technology. Therefore, extensive research activities are required to develop lightweight, easy to use, effective EMI shielding materials in daily and specific cases. This presentation regards recent results on C-polymer composites in the form of paints for use in EMI shielding in a wide frequency range, from 50 MHz to 30 GHz. The paints formulations are based on a combination of different carbon-based materials, having different morphology (graphite, graphitized carbon black, etc.), and the investigation is focused in getting a good conductivity, and other synergistic effects for shielding efficiency, in connection with achieving homogeneous, uniform, opaque layers, that can dray fast in air at room temperature. Improvement of graphene powder based paints was achieved by its combination with conducting polymers (PANI, PEDOT), an approach that led to novel composite materials in the form of thin layers with an improved shielding efficiency, this approaching -30% in the above-mentioned frequency range, for coatings consisting of three layers.
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