▎ 摘　　要

This work presents design, fabrication, and investigation of carbon nanotube (CNT), orange dye (OD), and graphene powder based multifunctional sensors. The output of the multifunctional sensors is observed as change in resistance and impedance values for an input change in temperature, pressure, and compressive displacement between the sensors electrodes. Using these sensors, temperature variation ranging from 30 to 65 circle C, pressure 0 to 0.1 kgfcm-2 and longitudinal compressive displacements of 0 to 110 mu m are measured as change in resistance and impedance at two fixed frequencies, i.e., 100 Hz and 100 KHz. An increase in both resistance and impedance of the sensors is observed with increase in temperature. The temperature coefficients of the sensors having resistances similar to 470 omega and similar to 890 omega were 1.0%circle C-1 and 1.9%circle C-1, respectively, when evaluated for temperatures ranging from 30 to 65 circle C. For applied pressure 0 kgfcm(-2) to 0.1 kgfcm(-2) and displacement 0 to 110 mu m the resistance of the multifunctional sensor decreases 1.3 to + 12.7 times (from 6730 omega to 5210 omega and 3410 omega to 269 omega) and 3.18 to 7. 53 times (2235 omega to 702 omega and 6787 omega to 901 omega), respectively. With increased thickness of OD layer from 300 mu m to 570 mu m, the output resistance and impedance of the sensors as a function of temperature also increased, exhibiting the improved sensitivity, however, at the expense of decreased pressure and displacement response of the sensors. Therefore, the thickness of OD film can be used as a design parameter for a desired sensitivity value to cater a particular application. The proposed multifunctional sensor can be a good candidate to measure temperature, pressure, and displacement of an industrial unit, such as flex bonding head because it offers light weight, simpler design, low maintenance, and eventually low cost.