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New material for next-gen flexible, stretchy electronics developed
Scientists have developed a hybrid conductive material - part elastic polymer, part liquid metal - that can be bent and stretched at will, and could pave the way for the next generation of flexible electronics. Circuits made with this material can take most two-dimensional shapes and are also non-toxic, according to a study published in the journal iScience.Â
Beijing : Scientists have developed a hybrid conductive material - part elastic polymer, part liquid metal - that can be bent and stretched at will, and could pave the way for the next generation of flexible electronics. Circuits made with this material can take most two-dimensional shapes and are also non-toxic, according to a study published in the journal iScience.
The material that the researchers fashioned is called a metal-polymer conductor (MPC), so called because it is a combination of two components with very different yet equally desirable properties. The metals in this case are not familiar conductive solids, such as copper, silver, or gold, but rather gallium and indium, which exist as thick, syrupy liquids that still permit electricity to flow.
The researchers found that embedding globs of this liquid metal mixture within a supporting network of silicone-based polymer yielded mechanically resilient materials with enough conductivity to support functioning circuits. Up close, the structure of the MPC can be likened to round liquid metal islands floating in a sea of polymer, with a liquid metal mantle underneath to ensure full conductivity. The researchers successfully tried out different MPC formulations in a variety of applications, including in sensors for wearable keyboard gloves and as electrodes for stimulating the passage of DNA through the membranes of live cells.
In principle, researchers state that their method for manufacturing MPCs, which involves screen printing and microfluidic patterning, can accommodate any two-dimensional geometry, as well as different thicknesses and electrical properties, depending on the concentrations of the liquid metal inks to be sprayed. This versatility could lead directly to desirable biomedical applications, such as flexible patches for identifying and mitigating heart disease.
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