Carbon Nanotube-Fastened Graphene Composites with Bubble-Induced Multireflections for Electromagnetic Interference Shielding with Water Repellence

The use of light and flexible electromagnetic interference (EMI) shielding materials, particularly those considered for water repellence, is crucial in managing radiation pollution for modern electronic devices. However, the limited flexibility, weight, and water repellence of available shields constrain their applications. Herein, we demonstrated the potential of a carbon nanotube-fastened graphene composite film for EMI shielding, whose surface is adhered by a thin hydrophobic SiO2 coating. The reduced graphene with a curve and fastened morphology could be stored and form interconnected bubbles in the interior. Thus, the obtained film with flexibility and a thin thickness presents extremely high EMI shield performance of 76.4 dB due to anomalous multireflections in the interconnected bubbles, essentially different from shields that mainly reflect electromagnetic waves on a surface. In addition, the reliable roughness results in strong adhesion of the hydrophobic coating on a surface and demonstrates stable water repellence, even in severe conductions. The superhydrophobic film is a promising shield that could solve critical pollution for modern electronic devices.