Hydrogels are essentially a gel in which the liquid component is water. They have been shown to act as a kind of power source or even as kind of stretchable touch screen that you could wear.

Now researchers at the University of Utah have used hydrogels to make a switch for transistors that could be called “squishy” because of their flexibility and stretchable quality. In research described in IEEE Electron Device Letters, the Utah researchers fabricated a metal-oxide hydrogel field-effect transistor (MOHFET) with a channel composed of a hydrogel embedded with gold nanoparticles.