Nickel substituted cadmium ferrite as room temperature operable humidity sensor

Add time:08/08/2019    Source:sciencedirect.com

In this work, maximum enhancement in room temperature humidity sensing response of cadmium ferrite (CF) due to substitution of nickel ion in it, to form nickel substituted cadmium ferrite (NSCF) by sol-gel auto combustion method is presented. The shift in vibration frequency corresponding to octahedral B-site and tetrahedral A-site of NSCF as compared to those of CF were confirmed from FTIR studies and correlated with theoretical calculations of respective force constants. The higher values of porosity and surface area and lower value of crystallite size of NSCF as compared to those of CF were confirmed from XRD studies. Increase in agglomeration of small sized grains forming many pores confirmed from comparative analysis of SEM images of CF and NSCF. The NSCF recorded a maximum sensing response of 99% as against 50% of CF when measured in the range 25% RH - 95% RH. The response and recovery times of NSCF were found to be 30 s and 45 s respectively while those of CF were 123 s and 154 s respectively. The NSCF sample showed stable sensing ability over a period of two months. The sensing mechanism is discussed on the basis of chemisorption, physisorption and capillary condensation processes.

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