Metallized Electrospun Nanofiber Networks as Versatile Platforms for Ultra‐Flexible and Transparent Electrodes

Transparent electrodes are essential components of flexible optoelectronic devices, incorporating nanofibers into their design enhances the functionality, flexibility, and optical performance. In this work, electrospun freestanding gold or silver metalized networks have been produced combining two simple and industrially scalable techniques, such as electrospinning and sputtering, resulting in readily usable nanofiber electrodes. The metalized nets are thoroughly characterized in terms of morphology, composition, and optical behavior, as a function of mesh transmittance and metal layer thickness, revealing a superior figure of merit (reaching 808 for Au‐coated nanofibers). The use of nylon 6/6 enhanced the robustness of the electrodes due to its intrinsic flexibility and resistance, leading to both high conductivity and transparency. Sheet resistances of approximately 3.05 Ω sq −1 for Au and 8.40 Ω sq −1 for Ag are obtained for meshes of up to 95% optical transmittance. At their highest transparency, these electrodes—once transferred onto flexible substrates—function effectively as a conductive medium capable of lighting a commercial LED. They also perform reliably as electrochemical electrodes, demonstrating their suitability for portable electrochemical devices. This fabrication strategy allows the production of large‐area transparent electrodes, which can be readily integrated with portable optoelectronic/electrochemical devices, for a broad variety of applications.