Abstract
CdO : ZnO hexagonal particles were synthesized by a sol–gel precipitation method at different annealing temperatures. A mixed crystal phase of cubic and wurtzite structures was observed from X-ray diffraction patterns. The micrographs showed hexagonal shapes of the CdO : ZnO nanocomposites particles. The energy dispersive X-ray spectroscopy mapping images showed a uniform distribution of the Cd and Zn. The CdO : ZnO nanocomposite pallet annealed at 550 °C has an electrical resistance of 0.366 kΩ at room temperature. The nanocomposites showed an excellent sensing response against oxygen gas with a sensing response of 47% at 200 °C for the CdO : ZnO particles annealed at 550 °C. The sensor response and recovery times were found to be 43s and 45s, respectively. The sensor response was due to the sorption of oxygen ions on the surfaces of the CdO : ZnO hexagonal particles.
Highlights
At the present time, with the rapid increase of many demands to boost productivity and performance, in industry, and in the domestic and agricultural settings, an increasing number of toxic, ammable and combustible chemicals and gases have been produced in our environment.[1]
All the samples showed diffraction peaks corresponding to cubic CdO and hexagonal ZnO with a dominating cubic structure, which con rmed the majority of CdO in the mixture
The intensity of the diffraction peaks that corresponds to the wurtzite ZnO increased with the annealing temperature from 450 to 600 C, which indicated that the higher annealing temperatures (ATs) was better for the formation of ZnO
Summary
One and two-dimensional nanostructures are extensively studied due to their peculiar and superior transport properties.[13]. The effect of annealing on the structural, morphological and electrical properties of CdO : ZnO nanostructure synthesis by a sol–gel method was investigated. The sensing properties such as selectivity, sensor response, response time and recovery speed of the gas sensor were investigated in detail for the CdO : ZnO nanostructures and a possible sensing mechanism is proposed. For this study we can understand the role of annealing temperature on different properties of CdO : ZnO particles and this is proposed a very low cost and easy method to obtain hexagonal particles, which are useful in surface reaction applications such as gas sensing. The obtained CdO : ZnO nanocomposites show excellent oxygen sensing properties
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