Fabrication of Stretchable Carbon Nanotubes Based sensor. The silver interdigitated electrodes were screen printed on a transparent plastic substrate (PET) and then dried at room temperature. Sonicate the solution for 20 min. And then 50 μL of CNT solution was dropped via a micropipette onto silver interdigitated electrodes and then the sensor was heat at a temperature of 100°c for 1 hour.