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One of the most promising technologies is based on electrically conductive plastics -- organic electronics.

To overcome this, the team designed a type of liquid ink made of conductive polymers.

For example, they can add conductive nanoparticles, such as silver or gold nanorods, which are critical to stretchable and wearable electronics.

When pressed together, electrostatic charges from the plastic film moved to the conductive ink, creating a current that could then flow out through a wire.

Now, researchers at Linköping University, Sweden, have developed a new method where organic semiconductors can become more conductive with the help of air as a dopant.