Freestanding “core-shell” AgNWs/metallic hybrid mesh electrodes for a highly efficient transparent electromagnetic interference shielding film

Abstract

We fabricated the freestanding “core-shell” AgNWs/ Ni mesh electrodes by employing AgNWs solution onto the freestanding Ni-mesh. The combination of AgNWs and Ni mesh resulted in higher electrical conductivity, thereby enhancing the electromagnetic interference (EMI) shielding effectiveness (SE). The hybrid freestanding electrode created highly effective transparent and flexible EMI shielding films, featuring an ultrathin thickness (3 µm), the high optical transparency of 93% at 550 nm, and a SE of 41.5 dB in the X-band, which exceeds that of 30 dB for a freestanding Ni-mesh (94%). We showed that the hybrid freestanding AgNWs/Ni-mesh film is a promising high-performance transparent and flexible EMI shielding material that satisfies the requirements for optoelectronic devices.

Low Cost and Facile Fabrication of a Micro‐Mold with High Aspect Ratio for Transparent Electrodes with Metal Mesh Using Micro‐Scale 3D Printing

“…In particular, metal mesh-based TEs with a high AR are difficult to manufacture, which limits their wide industrial application. At present, the fabrication methods of metal mesh-based TEs mainly include hybrid processes, such as photolithography and electroplating, [27,28] laser direct etching and electroplating, [29,30] nanoimprinting and scraping, [31][32][33][34] gravure printing, [35][36][37] direct production methods such as laser direct writing [38] and printing techniques. [22,[39][40][41][42][43] The above techniques for fabricating a metal mesh can be classified into mask method, mold method, and printing method.…”

“…The fabricated metal meshes have excellent optoelectronic and mechanical properties. Liu et al [29,30] fabricated embedded metal meshes using direct laser writing and electroplating techniques. This process has achieved great progress in cost while obtaining metal meshes with excellent optoelectronic properties.…”

“…As the core part of flexible optoelectronic devices, metal mesh FTEs are widely used in OLEDs, [35] flexible solar cells, [1] transparent supercapacitors, [7,29,30] and other fields. It is well known that embedded metal mesh has better mechanical fatigue strength, chemical stability, and environmental stability than embossed metal mesh, as a result, embedded metal mesh has received widespread attention.…”

“…Therefore, the advantage of the mold method for the fabrication of metal meshes of larger size has been proven, but the fabrication of molds still relies on mask methods such as photolithography and laser etching, and the fabrication process of the mold with high AR is complicated and expensive. In fact, it is difficult to fabricate metal meshes with AR greater than 2 [29] by either mask method or mold method, which greatly limits the further improvement of the optoelectronic properties of metal meshes. Printing methods mainly include electrohydrodynamic (EHD) jet printing, [22,[40][41][42][43] electric-field-driven (EFD) micro-scale 3D printing, [44][45][46][47] and inkjet printing.…”

2D MXene Ti3C2Tx Enhanced Plasmonic Absorption in Metasurface for Terahertz Shielding

“…Metamaterials achieve absorption at a specific terahertz frequency utilizing intrinsic loss with the aid of complex geometrical design and their control over dielectric permittivity [5] and conductivity properties [6]. However, single-mode metamaterials have the limitations of narrowband operating bandwidth [7] and low absorption [1], resulting in lower absorption efficiency, thus reducing performance [6]. Incorporating numerous resonant structures in metamaterial is an excellent way to improve the overall absorption i.e., broadband [8] and multilayer stack structure [9] has been reported in the spectral range from terahertz to optical regime [2].…”