Transparent
conductive film (TCF) fabricated with silver nanowires
(AgNWs) is one of the most promising candidates to replace the state-of-the-art
indium tin oxide films as electrodes in next generation flexible displays.
The adhesion of AgNWs on a substrate is one of the key limiting factors
that influence the yield and quality of downstream products. Inserting
an adhesive interlayer between the substrate and AgNWs complicates
the fabrication process and may worsen the uniformity of the films.
Herein, we report a self-adhesive coating ink that can realize tight
adhesion of AgNWs on the substrate. The ink consists of AgNWs and
sodium alginate. TCFs coated with the ink exhibit a strong adhesion
on the substrate, and no delamination is observed after peeling with
3 M tape, long-time immersion in a solvent, ultrasonicating in a water
bath, or multiple bending to a small radius. The optoelectronic performance
of TCFs after the aforementioned treatments remains constant and is
superior to those reported in the literature. The self-adhesive coating
ink makes delamination-free AgNW TCFs possible.
Silver nanowires are susceptible to degradation under ultraviolet (UV) light illumination. Encapsulating silver nanowire transparent conductive films (AgNW TCFs) with UV shielding materials usually result in the increasing of the sheet resistance or the decrease of the visible light transparency. Herein, we combine a reducing species (FeSO4) and a thin layer (overcoating) of UV shielding material to solve the stability and the optical performance issues simultaneously. The AgNW TCFs show excellent stability under continuous UV light illumination for 14 h, and their sheet resistance varies only 6%. The dramatic enhancement of the stability against UV light illumination for as-obtained TCFs will make them viable for real-world applications in touch panels and displays.
Generation of particle by-products during the synthesis of ultrathin silver nanowires can be suppressed via eliminating water in a precursor mixing step.
Silver nanowire transparent conductive film is one of the new indium-free electrode materials. It has attracted increasing attention from academia and industry due to its superior optoelectronic properties and excellent flexibility. It has been employed in a wide variety of applications in displays, touch panels, solar cells, smart heaters, electromagnetic interference shielding, and so on. However, silver nanowire transparent conductive film has a serious stability issue in service, for example, break or spheroidization above 300 ℃ under fulfidation, accelerating the degradation under ultraviolet light, pores formation or even breakdown due to electromigration. In this review, the degradation phenomena is thoroughly introduced, the degradation mechanisms is analyzed, and the remedy strategy of degradation is discussed.
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