Flexible Sandwich‐Structured Electromagnetic Interference Shielding Nanocomposite Films with Excellent Thermal Conductivities

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 17; no. 42; pp. e2101951 - n/a
• Main Authors: Zhang, Yali, Ruan, Kunpeng, Gu, Junwei
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.10.2021
• Subjects: Custom design; electromagnetic coordination; electromagnetic interference shielding; Electromagnetic shielding; Electronic devices; Electrospinning; Hot pressing; Iron oxides; Mechanical properties; Nanocomposites; Nanofibers; Nanotechnology; Polyvinyl alcohol; Portable equipment; sandwich structure; Sandwich structures; Wearable technology
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202101951

With the rapid development and popularization of smart, portable, and wearable flexible electronic devices, urgent demands have been raised for flexible electromagnetic interference (EMI) shielding films to solve related electromagnetic pollution problems. With polyvinyl alcohol (PVA) as polymer matrix, the sandwich‐structured EMI shielding nanocomposite films are prepared via electrospinning‐laying‐hot pressing technology, where Fe3O4/PVA composite electrospun nanofibers in the top and bottom layers and Ti3C2Tx/PVA composite electrospun nanofibers in the middle layer. Owing to the electrospinning process and the successful construction of the sandwich structure, when the amounts of Ti3C2Tx and Fe3O4 are respectively only 13.3 and 26.7 wt%, the EMI shielding effectiveness (EMI SE) of the sandwich‐structured EMI shielding nanocomposite films reach 40 dB with the thickness of 75 µm, higher than that of (Fe3O4/Ti3C2Tx)/PVA EMI shielding nanocomposite films (21 dB) prepared based on blending‐electrospinning‐hot pressing process under the same amounts of fillers. Furthermore, the prepared sandwich‐structured EMI shielding nanocomposite films possess excellent thermal conductivities and mechanical properties. This novel kind of flexible sandwich‐structured EMI shielding nanocomposite films with excellent EMI shielding performances, thermal conductivities, and mechanical properties presents broad application prospects in the fields of EMI shielding and protection for high‐power, portable, and wearable flexible electronic devices. Owing to the electrospinning process and the successful construction of the sandwich structure, the sandwich‐structured electromagnetic interference (EMI) shielding nanocomposite films prepared via electrospinning‐laying‐hot pressing technology, where Fe3O4/PVA composite electrospun nanofibers in the top and bottom layers and Ti3C2Tx/PVA composite electrospun nanofibers in the middle layer, possess excellent EMI shielding performances, thermal conductivities, and mechanical properties.