Enhanced sensing response of Cd2+ substitution cobalt chromate ceramics for humidity sensors

For the first time, we have prepared cadmium-doped cobalt chromate with chemical formula Co1-xCdxCr2O4 (where x = 0, 0.03, 0.06, 0.09, 0.12, and 0.15) nanoparticles by solution combustion method. To examine the structural and morphological changes of the prepared samples were subjected to characterise X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDX). The XRD data demonstrate the formation of a single-phase cubic structure without an impurity peak emerging. Further, the strain and particle size components were calculated using the Williamson¿all method and results are in good agreements with XRD results. The Cd-doped Co1-xCdxCr2O4 was tested to detect humidity in the relative humidity range of 11 to 99%. The sample with the highest sensing response, Cd = 0.15, had response and recovery times of 35.6 and 6.5s, respectively, and a 99% sensing response. Therefore, based on our findings, the synthesised materials are appropriate for use in humidity sensor applications.

Enhanced sensing response of Cd2+ substitution cobalt chromate ceramics for humidity sensors Articles