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Interface modified flexible printed conductive films via Ag <sub/>2</sub> O nanoparticle decorated Ag flake inks
摘要： A new approach to stable, low resistance inexpensive printed flexible conductive inks is proposed. Silver inks have been extensively studied and commercialized for applications in printed electronics due to the inherent high conductivity and stability of silver, even in particulate-based percolation networks processed at temperatures compatible with low cost polymer films such as polyethylene terephthalate (PET). Recent interest in flexible and even stretchable circuits, however, has presented new challenges for particle-based inks as mechanical strains can result in the opening of critical particle-to-particle contacts. Here we report a facile, low cost method for the single step synthesis of stable, printable nanoscale Ag2O-decorated Ag flake inks which can be converted to highly conductive Ag films at 150°C curing temperature without the use of limited shelf life organometallics or low metal loading nanoparticles to modify the interface between silver flakes. Analysis indicate that decoration of Ag flakes with Ag2O nanoparticles (NPs) during ink synthesis improves the conductivity and flexibility of printed silver films by forming bridging interconnections between Ag flakes after low temperature reduction of the Ag2O NPs. In this work, printed nano-decorated silver conductors with starting oxide to metal weight ratios of 5:95 exhibited lateral resistivities lower than 1.5×10-5 ? cm, which was 35% less than films derived from undecorated Ag flake inks of the same total Ag loading and binder system. This resistivity difference increased to 45% after cyclic bend testing showing increased resilience to repeated flexing for the nano-decorated inks. Through detailed compositional and morphological characterizations, we demonstrate that such improved conductivity and flexibility is due to a more effective bridging afforded by the in-situ synthesized Ag NPs on the surface of Ag flakes. These properties, combined with the simplified syntheses method of the nano-ink, make the material a viable, advantageous alternative to the limited number of stretchable conductors currently available.
关键词： Ag2O nanoparticle-decorated Ag flake inks,printed conductive films,interface modification,silver ink
更新于2025-11-14 17:04:02
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Facile preparation of stable reactive silver ink for highly conductive and flexible electrodes
摘要： Stability of conductive ink and mechanical ?exibility of conductive pattern are essential for ?exible printed electronics. In this work, we reported a stable reactive silver ink for the facile fabrication of ?exible electrodes. The ink was mainly composed of silver-isopropanolamine (IPA) complex, formic acid reductant, and hydroxyethyl cellulose (HEC) adhesive agent, and it displayed good chemical stability. The ?exible electrodes on polyimide (PI) substrates were achieved by mask-printing and thermal sintering of the ink, and the e?ects of sintering parameters and HEC adhesive agent content on the electrical and ?exible properties and microstructure evolutions of silver layer were systematically investigated. Consequently, the silver layer sintered at 110 °C yields low electrical resistivity of 12.1 μΩ·cm, which is only eight times higher than that of bulk silver. Furthermore, the sintered silver layer still presents excellent ?exibility and low relative resistances after the bending, twisting, and folding tests. These results demonstrate that the stable reactive silver ink provides a promising and low cost opportunity for low temperature design and fabrication of high performance ?exible printed electronics.
关键词： Reactive silver ink,High conductivity,Silver layer,Flexibility,Printed electronics
更新于2025-09-23 15:23:52