Inkjet Printing of Highly Sensitive, Transparent, Flexible Linear Piezoresistive Strain Sensors

Flexible strain sensors are fabricated by using a simple and low-cost inkjet printing technology of graphene-PEDOT:PSS (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)) conductive ink. The inkjet-printed thin-film resistors on polyethylene terephthalate (PET) substrate exhibit an excellent optical transmittance about 90% over visible wavelength range from 400 to 800 nm. While external mechanical is applied as sensors, gauge factor (GF) the piezoresistive (PR) can be evaluated. To improve GF value PR high resistive (HR) path caused phase segregation PEDOT:PSS polymer material is, for first time, proposed perpendicular sensing direction. increase in with HR number without marked hysteresis found. result explained tunneling effect varied initial distances barriers due HR. Finally, approximately 165 three paths obtained linear output signal at 0% 0.33%, further achieving highly sensitive, transparent, flexible sensors.