Pressure sensors were fabricated based on porous polymer films coated onto cotton fabric modified with reduced graphene oxide (rGO). The cotton fabric was modified with a silane coupling agent to improve the adhesion between the cotton fabric and rGO. The porous structure was constructed to enlarge the surface area of the coating polymer. The fabrication process was characterized with Fourier Transform Infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and Raman spectrometry. Owing to the materials and constructed porous structure, the prepared devices (1 × 2 cm2) showed an excellent electric output with a voltage of 132 V and an outstanding linear relationship of applied forces and frequencies with values of adjusted R2 over 0.97. In practical detection of human motion, the prepared pressure sensor gave clear signals for each step during the walking, jumping and running.
