Abstract
In this work, pristine and tin substituted cerium oxide nanoparticles (NPs) namely Ce1−xSnxO2, x = 0.0, 0.2, 0.4, 0.6, were prepared by a simple microwave synthesis method for humidity sensing studies. Different characterization methods such as scanning electron microscopy, transmission electron microscopy and energy-dispersive x-ray spectroscopy analysis demonstrated the formation of spherical NPs with an approximate crystalline size of 5–10 nm, desirable chemical composition and presence of oxygen defects. Also, optical measurements results demonstrated the increase of the band gap energy in tin substituted NPs due to formation of intermediate energy levels as a result of tin substitution. Furthermore, humidity sensing studies showed a high response of the fabricated sensors to humidity as a result of very small particle sizes along with the presence of tin in cerium oxide NPs. Finally, the fabricated humidity sensors showed a very good reproducibility of 95%. The results of this study confirm the possibility of realization of highly sensitive humidity sensors based on tin substituted cerium oxide NPs for application in real environments.
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Vigneselvan, S., Manikandan, V., Petrila, I. et al. Effect of Tin Element on the Structural, Optical and Humidity Sensing Properties of Cerium Oxide Nanoparticles. J. Electron. Mater. 48, 7495–7506 (2019). https://doi.org/10.1007/s11664-019-07563-2
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DOI: https://doi.org/10.1007/s11664-019-07563-2