Please use this identifier to cite or link to this item: https://physrep.ff.bg.ac.rs/handle/123456789/1087
Title: Nickel manganite-sodium alginate nano-biocomposite for temperature sensing
Authors: Dojcinovic, Milena P.
Vasiljevic, Zorka Z.
Kovac, Janez
Tadić, Nenad B. 
Nikolic, Maria Vesna
Keywords: Nano-biocomposite;Nickel manganite;NTC thermistor;Sodium alginate;Temperature sensing
Issue Date: 1-Sep-2021
Journal: Chemosensors
Abstract: 
Nanocrystalline nickel manganite (NiMn2 O4) powder with a pure cubic spinel phase structure was synthesized via sol-gel combustion and characterized with XRD, FT-IR, XPS and SEM. The powder was mixed with sodium alginate gel to form a nano-biocomposite gel, dried at room temperature to form a thick film and characterized with FT-IR and SEM. DC resistance and AC impedance of sensor test structures obtained by drop casting the nano-biocomposite gel onto test interdigitated PdAg electrodes on an alumina substrate were measured in the temperature range of 20–50◦ C at a constant relative humidity (RH) of 50% and at room temperature (25◦ C) in the RH range of 40–90%. The material constant obtained from the measured decrease in resistance with temperature was determined to be 4523 K, while the temperature sensitivity at room temperature (25◦ C) was −5.09%/K. Analysis of the complex impedance plots showed a dominant influence of grains. The decrease in complex impedance with increase in temperature confirmed the negative temperature coefficient effect. The grain resistance and grain relaxation frequency were determined using an equivalent circuit. The activation energy for conduction was determined as 0.45 eV from the temperature dependence of the grain resistance according to the small polaron hopping model, while the activation energy for relaxation was 0.43 eV determined from the Arrhenius dependence of the grain relaxation frequency on temperature.
URI: https://physrep.ff.bg.ac.rs/handle/123456789/1087
DOI: 10.3390/chemosensors9090241
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