Abstract
Recently, high-resolution patterning techniques of stretchable electronics advanced extensively. An important trend is to fabricate complex circuits with varied sizes in a small area, which is a technical challenge to current conductive ink printing technologies. Here, we introduce a new strategy for multi-resolution liquid alloy printing, which can tune the resolution of printed liquid alloy trace in real time with the squeezing effect of compound viscoelastic flow. A newly developed coaxial nozzle with the inner nozzle extension (CNINE) is used to wrap and squeeze liquid alloy steadily and effectively. By controlling the working parameters and compound flow properties, liquid alloy patterns with different widths are obtained continuously. This work offers a new way to rapidly manufacture complex stretchable electronics patterning in multi-resolution.
Highlights
Owing to their unique properties such as great compliance to human bodies, stretchable electronics have attracted intensive attention in recent years [1]
When PDMS is introduced as viscoelastic outer flow at the same flowrate, the extruded liquid alloy from the inner channel is like an inverted conic and its diameter is a little bit smaller than ID
We present a new strategy for multi-resolution liquid alloy printing, which can tune the printed liquid-alloy trace resolution on demand
Summary
Owing to their unique properties such as great compliance to human bodies, stretchable electronics have attracted intensive attention in recent years [1]. Various applications such as stretchable antennas [2], soft sensors [3,4], ultra-stretchable nanogenerator [5], and flexible microelectrodes [6] are demonstrated because of their elastic mechanical responses [7]. Many processing technologies for liquid-alloy-based stretchable electronics such as microchannel injection [12,13], mask deposition [14,15,16] and micro-contact printing [17], are developed for high resolution applications. Many processes during fabricating, such as photolithography, are not as convenient or cost-effective
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