Carbon nanotube films embedded with Cu@C nanocubes for electromagnetic interference shielding

Abstract

Flexible carbon tube films for electromagnetic interference (EMI) shielding are assembled by mixing the well‐aligned Cu@C core‐shell nanocubes with multi‐walled carbon nanotubes (MWCNTs). The Cu@C core‐shell nanocubes are achieved by the thermal pyrolysis of polyvinylpyrrolidone (PVP) coating on Cu2O nanocubes. With the optimal PVP concentration of 1.5 mg/mL, the Cu@C/MWCNTs composite film with ultra‐thin thickness (52.2 μm) displays good conductivity of 12.5 S cm−1 and excellent specific EMI shielding value of 510.73 dB mm−1, which is higher than the pure MWCNTs film (439.50 dB mm−1) under the same weight condition. Moreover, the 1.5 mg/mL‐Cu@C/MWCNTs composite film exhibits highly mechanical repeatability after being bended for 10,000 cycles. The carbon layers protecting metal nanoparticles can partly replace precious carbon nanotubes to construction highly flexible composite film with anticipated electrical conductivity, which have a good application prospect for thin, lightweight and flexible EMI shielding fields.

Hollow Metal–Organic Framework/MXene/Nanocellulose Composite Films for Giga/Terahertz Electromagnetic Shielding and Photothermal Conversion

“…Additionally, the tensile strain percentage of the d-Ti 3 C 2 T x , TOCNF, and HMN composite films is about 1.0%, 5.5%, and 4.8%. The mechanical properties are helpful to improve the adaptability of electromagnetic shielding materials in various application scenarios [ 70 ]. Interestingly, because Co-HCC nanoparticles have high magnetism, they can be easily attracted by magnets without falling off.…”

Ultrafine Aramid Nanofiber-Assisted Large-Area Dense Stacking of MXene Films for Electromagnetic Interference Shielding and Multisource Thermal Conversion

“…The rapid development of wireless wearable electronic devices inevitably leads to electromagnetic radiation pollution, which affects the normal operation of precision equipment and people’s health. − In consequence, flexible electromagnetic interference (EMI) shielding films rise in response to the proper time and conditions. Moreover, in response to the microminiaturization and integration of devices, the flexible EMI shielding films put forward the higher requirements in mechanical properties and EMI shielding efficiency at ultrathin thickness. − To date, attributing to the unique “brick-mortar” structure, the nacre-like lamellar films composed of conductive fillers and polymer binders exhibit the advantages of ultrathin thickness, lightweight, high flexibility, excellent mechanical properties, and easy processing. , To ensure the high electrical conductivity and EMI shielding performance of nacre-like lamellar films, the highly oriented and dense stacking of conductive fillers is the key, yet is the challenge in large-scale preparation.…”