Abstract
LaCoO3 is a p-type semiconductor material with bandgap of ~2.2 eV, which compared with those reported for TiO2 and ZnO (3.2 and 3.3 eV, respectively) make this material a potential candidate for detecting UV radiation. In this work nanostructured LaCoO3 was prepared by the solution-polymerization method, using polyvinyl alcohol as polymerizing agent. The morphology of the powder calcined at 700°C corresponds to nanostructured sheets having abundant porosity. Thick films were prepared by a simple deposition method using a suspension of the powder. The detection of UV (λ = 365 nm) showed a uniform response pattern. When the optical irradiance was varied the results revealed a quantitative detection. Analogous results were obtained using light of larger λ. In conclusion, LaCoO3 may be used as an alternative UV detector material to prevent skin cancer and as photoresistive material for solar photocells, among others.
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