Abstract
We report chemical synthesis and characterization of micro/mesoporous CaTiO3 by X-ray diffraction (XRD), nitrogen sorption/desorption, small angle XRD, diffuse reflectance optical spectroscopy, and luminescence spectroscopy under ambient conditions. We determined the energies of absorption and emission transitions through electronic midgap states in micro/mesoporous calcium titanate by optical spectroscopy, “conventional” photoluminescence (PL) spectroscopy and, for the first time, synchronous luminescence spectroscopy at 25 °C. Micro/mesoporous CaTiO3 reversibly sorbs and desorbs water vapor in ambient air, with water sorption capacity being close to the total pore volume. The luminescence of micro/mesoporous CaTiO3 in visible range at room temperature is repeatedly significantly increased upon desorption of water and decreased (quenched) upon sorption of water vapor in air, due to the interactions of the adsorbate with electronic surface midgap states.
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Acknowledgements
A.S. thanks Dr. Dmitri Barbash from Drexel University Core Facilities for access to the XRD instrument. A. A. thanks Rutgers University Camden for her Dean’s Graduate Research Grant.
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Alzahrani, A., Samokhvalov, A. Porous calcium titanate and sorption and desorption of water under ambient conditions: a study by conventional and synchronous luminescence spectroscopy. J Porous Mater 24, 1145–1154 (2017). https://doi.org/10.1007/s10934-016-0354-1
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DOI: https://doi.org/10.1007/s10934-016-0354-1