Flexible MXene Hybrid Films with a Tuned Silver Nanowire Framework for Electromagnetic Interference Shielding and Ultralow Voltage-Driven Joule Heating

As wearable electronics and medical implants evolve, there is an increasing demand for protective devices that provide both electromagnetic interference (EMI) shielding and heating capabilities while operating at weaker voltages to accommodate various power sources. Herein, a simple, cost-friendly, step-by-step vacuum-assisted filtration method is utilized to prepare asymmetrical layered “MXene–MXene@silver nanowires(AgNWs)-MXene-AgNWs” hybrid films, exhibiting a “mille-feuille”-like structure with a thickness of 9.02 μm, possessing enhanced flexibility suitable for various applications. This composite structure exploits the excellent electrical and thermal conductivity of AgNWs together with the notable EMI shielding performance of MXene (SE/t = 112,967 dB cm–1 ). By tuning the MXene layer and AgNW framework, the multilayer structured film achieves excellent EMI shielding effectiveness (SE/t = 68,825 dB cm–1). Due to the introduction of the AgNW layer, its interface reflection properties lead to differential electromagnetic wave (EMW) consumption in the structure, resulting in an excellent EMI shielding of 62.08 dB. The enhanced EMI shielding is attributed to the AgNW layer interface reflection, which significantly increases the effective consumption pathway of incident EMWs. Moreover, its Joule heating performance reaches 227.7 °C at 1.0 V, exhibiting a superior ultralow voltage drive characteristic. The flexible and self-supported composite film has significant potential applications in protecting human body implants, such as cardiac pacemakers, from the influence of EMI pollution. Furthermore, it can be utilized in extreme weather conditions for deicing, defogging, and antifreezing purposes

High-Performance Organic Small-Molecule Panchromatic Photodetectors

High-performance panchromatic organic photodetectors (OPDs) containing small molecules lead phthalocyanine (PbPc) and C₇₀ fullerene as donor and acceptor, respectively, were demonstrated. The OPDs had either a PbPc/C₇₀ planar heterojunction (PHJ) or a PbPc/PbPc:C₇₀/C₇₀ hybrid planar-mixed molecular heterojunction (PM-HJ) structure. Both the PHJ and the PM-HJ devices showed a broad-band response that covered wavelengths from 300 to 1100 nm. An external quantum efficiency (EQE) higher than 10% and detectivity on the order of 10¹² Jones were obtained in the wavelength region from 400 to 900 nm for the PHJ device. The EQE in the near-infrared region was enhanced by using the PM-HJ device structure, and a maximum EQE of 30.2% at 890 nm was observed for the optimized device with a 5% PbPc-doped C₇₀ layer. Such an EQE is the highest at this wavelength of reported OPDs. The detectivity of the PM-HJ devices was also higher than that of the PHJ one, which is attributed to the increased efficiency of exciton dissociation in bulk heterojunction structure, increased absorption efficiency caused by formation of triclinic PbPc in the PbPc:C₇₀ mixed film when it was deposited on a pristine PbPc layer, and high hole mobility of the PbPc-doped C₇₀ layer