CHARACTERIZATION OF COPPER-COBALT FERRITES FOR HUMIDITY SENSOR APPLICATION
Abstract
- Nanosized Copper-Cobalt ferrites with the general formula CuxCo1-xFe2O4 (where x = 0.00 – 1.00 with the step of 0.25) were prepared by auto-combustion method using Analytical Reagent (AR) grade Copper Nitrate, Cu(NO3)2, Cobalt Nitrate Hexahydrate, Co(NO3)2.6H2O and Ferric Nitrate Nonahydrate, Fe(NO3)3.9H2O. The samples were firstly characterized by X-ray diffraction to examine the crystal structure. The average crystallite sizes were estimated from line broadening of the collected XRD patterns to determine the nanosized ferrites. Microstructural characteristics of grain shape, grain size and homogeneity of the samples were examined by Scanning Electron Microscopy (SEM). It was found that the grain shapes of the samples varied from block shape to stone-like shape with the contents x of Cu. The grain size, generally, of x = 0.50 was the largest one among the investigated samples. For the applications of humidity sensors, the samples were made into circular shape pellets and the variations of the electrical resistance with the corresponding humidity range were studied in this work.
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Year
- 2020
Author
-
Aye Aye Lwin
Subject
- Physics
Publisher
- Myanmar Academy of Arts and Science (MAAS)