Synthesis of Pt-Loaded Y2WO6:Eu3+ Microspheres and Their Hydrogen-Sensitive Turn-Off Luminescence

Hong Ye; Risako Hara; Manabu Hagiwara; Shinobu Fujihara

doi:10.1021/acsomega.9b04476

Synthesis of Pt-Loaded Y₂WO₆:Eu³⁺ Microspheres and Their Hydrogen-Sensitive Turn-Off Luminescence

ACS Omega. 2020 Mar 17;5(12):6697-6704. doi: 10.1021/acsomega.9b04476. eCollection 2020 Mar 31.

Authors

Hong Ye¹, Risako Hara¹, Manabu Hagiwara¹, Shinobu Fujihara¹

Affiliation

¹ Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.

Abstract

Pt nanoparticles were loaded on Y₂WO₆:Eu³⁺ phosphor microspheres to enhance hydrogen sensitivity at low temperatures through turn-off luminescence. Mesoporous Y₂WO₆:Eu³⁺ microspheres were synthesized first by a hydrothermal method. Pt loading on the surface of the Y₂WO₆:Eu³⁺ microspheres was then carried out by a method of the self-regulated reduction of surfactants using aqueous K₂PtCl₄ solutions. Structural and morphological properties of unloaded and Pt-loaded Y₂WO₆:Eu³⁺ 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 Y₂WO₆:Eu³⁺ microspheres, due to ⁵D₀ → ⁷F _J (J = 0, 1, 2, 3, 4) electronic transitions of doped Eu³⁺ 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/Y₂WO₆:Eu³⁺ microspheres in response to hydrogen gas are illustrated in detail.