Multifunctional Flexible MXene/AgNW Composite Thin Film with Ultrahigh Conductivity Enabled by a Sandwich‐Structured Assembly Strategy

Abstract

Flexible composite films have attracted considerable attention due to great potential for healthcare, telecommunication, and aerospace. However, it is still challenging to achieve high conductivity and multifunctional integration, mainly due to poorly designed composite structures of these films. Herein, a novel sandwich‐structured assembly strategy is proposed to fabricate flexible composite thin films made of Ag nanowire (AgNW) core and MXene layers by combination of spray coating and vacuum filtration process. In this case, ultrathin MXene layers play crucial roles in constructing compact composite structures strongly anchored to substrate with extensive hydrogen‐bonding interactions. The resultant sandwich‐structured MXene/AgNW composite thin films (SMAFs) exhibit ultrahigh electrical conductivity (up to 27193 S cm−1), resulting in exceptional electromagnetic interference shielding effectiveness of 16 223.3 dB cm2 g−1 and impressive Joule heating performance with rapid heating rate of 10.4 °C s−1. Moreover, the uniform SMAFs can also be facilely cut into kirigami‐patterned interconnects, which indicate superior strain‐insensitive conductance even after long‐term exposure to extreme temperatures. The demonstrated strategy offers a significant paradigm to construct multifunctional composite thin films for next‐generation integrated flexible electronics with practical applications.

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

“…Figure a shows that the I − V curves of all MXene/UANF films pass through the origin and exhibit a typical linear relationship, showing excellent volt-ampere characteristics. According to Joule’s law (where Q , U , R , and t represent the Joule heat generated by the passed current, the applied voltage, the sample resistance, and working time, respectively), the better the conductivity of the sample means that the more Joule heat is generated at the same applied voltage. , Undoubtedly, MA-80 film exhibits the highest saturation temperature in all composite films due to its highest electrical property (Figure S13). Next, the MA-60 film with satisfactory mechanical strength is investigated as an electric heater for the exploration of Joule's heating property in consideration of electrothermal conversion.…”