We report newly designed pressure and displacement capacitive sensors based on a flexible paper-CNT structure. The carbon nanotube (CNT) powder was deposited on a thin paper substrate and was pressed at an elevated temperature. The sheet resistance of the paper-CNT films was in the range of 2-4 kΩ/cm 2 . The paper-CNT films were used to fabricate pressure and displacement sensors. The sensitivities of the pressure and the displacement sensors were found to be 17.3 pF•m 2 /kN and 0.93 10 −3 pF/µm, respectively. The experimental results were compared with the simulated data and they found good agreement with each other.
In this study, the photocapacitive behavior of organic semiconductor, photosensitive material, poly-Nepoxypropylcarbazole (PEPC) doped with tetracyanoquinodimethane (TCNQ) and copper phthalocyanine (CuPc) were investigated. A sandwich type CG/PEPC-TCNQ/Al photocapacitive detector was fabricated by screen printing technology. Thin films of the copper phthalocyanine (CuPc) were deposited by vacuum evaporation on glass substrates with silver surface-type electrodes and a Ag/CuPc/Ag photo capacitive detector was fabricated. It was shown that under filament lamp illumination up to 2000 lx the capacitance of the CG/PEPC-TCNQ/Al photocapacitive detectors increased up to 5 % with respect to the dark condition . Similarly the capacitance of the Ag/CuPc/Ag photocapacitive detectors increased continuously up to 20 % at 1000 lx relative to the dark condition. It is assumed that photocapacitive response of the detectors is associated with polarization due to the transfer of photogenerated electrons and holes.
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