Session 8-2

Abstract

We propose a novel liquid-mediated patterning system manipulated by liquid-solid nonequilibrium heterointerface (NEHI) for additive manufacturing of soft devices with high scalability, deformability, and cost efficiency. The NEHI features a dynamic interplay between a continuous liquid phase and a patterned solid phase differentiated by surface free energy and surface charge. This unique configuration facilitates selective wetting/dewetting of colloidal inks on substrates, contributing to the precise alignment of functional micro-/nanomaterials into arbitrary structures after room-temperature drying. By simple bar coating, various functional nanoparticles and nanowires can be self-assembled on the substrates with unprecedently high resolution (600 nm in width), excellent stretchability, and reliable performance (Fig. 1). The proposed system further enables layer-by-layer fabrication of organic thin-film transistors (OTFTs) array with a short channel length of 1 μm (Fig. 2). These findings demonstrate that the NEHI enables precise control over materials properties and electronic circuit layouts on deformable substrates, marking a significant step forward in the sustainable development of advanced soft devices.