Conventional conductive Ti3C2Tx MXene films are limited by their low transparency and brittleness. Herein, we demonstrate a crack-template assisted spraying methodology for the fabrication of transparent, flexible, and conductive MXene grid–silver nanowire hierarchical films for high-performance electromagnetic interference (EMI) shielding, joule heating, and resistive touch panel applications. The conductive grid skeletons are constructed by depositing MXene sheets into the cracks of the templates followed by removing the templates. By tuning the loading density of MXene sheets, both optical transmittance and electrical conductivity of MXene grid skeletons can be precisely manipulated. The resultant conductive grid exhibits an EMI shielding efficiency of 21.7 dB and fair transmittance simultaneously. Crucially, one-dimensional silver nanowires (AgNWs) are adopted to construct hierarchical structures for increasing electron transport channels and enhancing light penetration. The hierarchical MXene grid/AgNW film achieves a high transmittance of 81% and an excellent EMI shielding efficiency of 24.6 dB. The transparent, flexible and conductive MXene grid/AgNW film is suitable for transparent heaters and resistive touch panels. The integration of grid fabrication and the hierarchical structure design effectively balances the transparency and the conductivity, and is promising for producing multifunctional films with high transparency, high conductivity, and high EMI shielding efficiency.
Sheng Qiu,Yanan Zhao,Kai Wang,Jinbin Luo,Rui Wang,Xinwei Jiang,Jingwei Chen,Abdulhakem Y. Elezzabi,Wu Zhang,Hao Jia,Haizeng Li
Zn anode-based electrochromic devices (ZECDs) stand out as a highly promising technology in the upcoming era of multifunctional electronic devices, offering a blend of electrochromic capabilities and energy storage functions within a single transparent platform. However, significant challenges persist in achieving efficient patterning, ensuring long-term stability, and fast color-switching kinetics for these devices. In this study, heterogeneous tungsten oxide nanowires (W 17 O 47 /Na 0.1 WO 3 , WNOs) are formulated into inkjet printing ink to assemble patternable ZECDs. The heterogeneous electrode structure of WNO enables a highly capacitive-controlled mechanism that promotes fast electrochromic/electrochemical behavior. Notably, by utilizing a three-dimensional MXene mesh modified substrate, the inkjet-printed ZECDs exhibit a wide optical modulation range of 69.13%, rapid color-changing kinetics ( t c = 4.1 s, t b = 5.4 s), and highly reversible capacities of 70 mAh cm −2 over 1000 cycles. This scalable strategy develops the patterned electrodes with a wide optical modulation range and substantial energy storage properties, offering promising prospects for their application in next-generation smart electronics.
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