High-performance carbon nanotube/polyimide composite films for EMI shielding

The development of portable communication devices has turned to high frequency, light weight, and miniaturization. The devices have provided convenience in daily life, and they have also caused serious electromagnetic radiation. The research on the composite with high electromagnetic interference (EMI) shielding effectiveness has become crucial. In this work, an efficient strategy was provided by electrospinning and vacuum-assisted filtration methods for fabricating carbon nanotube/polyimide (CNT/PI) composite film. The CNT/PI composite film exhibited good mechanical performance, whose Young's modulus and the tensile strength were 446.1 MPa and 36.85 MPa, respectively. In addition, the total shielding effectiveness of CNT/PI composite films in the X-band (8.2–12.4 GHz) reached 78.6 dB. This work also provides a potential method for preparing high-performance composite materials.