Fabrication and linearisation of conformable POMANI-Mn3O4 nanocomposite based thermistor for temperature monitoring applications in prosthetic gloves

摘要

The present work is a step towards design and fabrication of conformable temperature sensor for the prosthetic gloves/hand in the temperature range of 70 degrees C to 175 degrees C. HCl doped thin film of poly-o-methyl aniline (POMANI)-Mn3O4 nanocomposite has been used to realization of temperature sensors on glass and fire retardant glass cloth substrates. The effect of various concentrations of these nanocomposites on thin film based fabricated thermistors were experimentally investigated. The nonlinear property of NTC thermistors restricts the utility of these thermistors as temperature sensor, although they have high sensitivity for temperature sensing. Keeping above point in view, seven methods of linearization techniques have been analysed to linearise the thin film based fabricated thermistors (on glass substrate) and investigated for best results. All these methods were first designed and simulated on ORCAD P-SPICE tool. Further, shunt with log amplifier this method was used to linearise all the flexible thin film based fabricated thermistors to analyse the linearization error and temperature sensing range. The desirable temperature sensor from poly-o-methyl aniline (POMANI)-Mn3O4 nanocomposites based thermistors were investigated and fabricated for four different temperature zone points and surface temperature sensing in prosthetic gloves/hand. The zone-I was taken up to 90 degrees C, zone-II upto 120 degrees C, zone-III upto 150 degrees C and zone-IV above 150 degrees C. The contact surface can be tailored according to the requirement. The fabricated temperature sensor displayed thermistor constant (beta O-(100-170(C))) as 8080 K, activation energy 0.696eV and the dissipation constant 0.202 mu watt/degrees C. (C) 2018 Published by Elsevier B.V.