Novel gas sensor with dual response under CO(g) exposure: Optical and electrical stimuli
- Rocha, L. S. R.
- Cilense, M.
- Ponce, Miguel Adolfo
- Aldao, Celso Manuel
- Oliveira, L. L.
- Longo, E.
- Simoes, A. Z.
DOIAbstract
In this work, a lanthanum (La) doped ceria (CeO2) film, which depicted a dual gas sensing response (electric and optical) for CO(g) detection, was obtained by the microwave-assisted hydrothermal (HAM) synthesis and deposited by the screen-printing technique, in order to prevent deaths by intoxication with this life-threatening gas. An electric response under CO(g) exposure was obtained, along with an extremely fast optical response for a temperature of 380 °C, associated with Ce+4 reduction and vacancy generation. A direct optical gap was found to be around 2.31 eV from UV–Vis results, which corresponds to a transition from valence band to 4f states. Due to the anomalous electron configuration of cerium atoms with 4f electrons in its reduce...
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