Pt nanoparticles were loaded on YWO:Eu phosphor microspheres to enhance hydrogen sensitivity at low temperatures through turn-off luminescence. Mesoporous YWO:Eu microspheres were synthesized first by a hydrothermal method. Pt loading on the surface of the YWO:Eu microspheres was then carried out by a method of the self-regulated reduction of surfactants using aqueous KPtCl solutions. Structural and morphological properties of unloaded and Pt-loaded YWO:Eu microspheres were investigated by various techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The relative photoluminescence intensity of the Pt-loaded YWO:Eu microspheres, due to D → F ( = 0, 1, 2, 3, 4) electronic transitions of doped Eu ions, was found to decrease as low as 22% after the microspheres were kept in the hydrogen gas atmosphere at a low temperature of 150 °C for 15 min. Meanwhile, mechanisms underlying this turn-off luminescence of the Pt/YWO:Eu microspheres in response to hydrogen gas are illustrated in detail.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7114682 | PMC |
| http://dx.doi.org/10.1021/acsomega.9b04476 | DOI Listing |
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