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They used a T-shirt bought from a local discount store, which was soaked in a solution of fluoride, dried and then baked in an oxygen-free environment at high temperature.
The fibres in the fabric converted from cellulose to activated carbon during the process, but the material remained flexible.
By using small parts of the fabric as an electrode, the researchers showed that the material could be made to act as a capacitor.
Fluoride is the anion F−*, the reduced form of fluorine when as an ion and when bonded to another element.always in combination / compound with another element or elements )..don't try making your own textile capacitors at home..