Electric properties of flexible rubber-based CNT/CNT-OD/Al cells fabricated by rubbing-in technology

Flexible rubber based CNT/CNT-OD/Al cells were designed, fabricated and tested for multi-sensing and filter applications. Rubbing-in technology was used to fabricate the cells containing 12–17 μm thick active layers of CNT-OD (50:50 wt%). I–V characteristics of the cells were measured and the nonlinearity coefficient (β) was found in the interval of 1.8 to 2.3. The cells were tested for pressure, displacement and temperature sensing in the range of 0–33 gf/cm2, 0–250 μm and 21–67 °C, respectively. Sensing mechanism was based on resistance/impedance change. The cells showed sensitivities up to −424.2 Ωcm2/gf, −40.0 Ω/μm and −402 Ω/°C for pressure, displacement and temperature, respectively. The cells’ cutoff frequency was equal to 20 kHz. The fabricated cells potentially can be used as displacement, pressure, temperature sensors and frequency low pass filter as well.