Morphological control and upconversion luminescence of hollow CeO2 and Er3+-Yb3+ codoped CeO2 particlesElectronic supplementary information (ESI) available: XRD patterns, SEM images, TEM images, and upconversion emission spectra. See DOI: 10.1039/c6ce01550f

Hollow CeO 2 particles with three types of morphologies (rod, rhombus, and dumbbell) were synthesized by retention of the morphology of Ce(OH)CO 3 precursors during interfacial reactions of Ce(OH)CO 3 with aqueous hydrogen peroxide solution. The wall areas of the hollow CeO 2 particles comprised cry...

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Main Authors: Yada, Mitsunori, Miyaguchi, Takashi, Watanabe, Daiki, Hayashi, Yukako, Ayabe, Tatsuya, Torikai, Toshio, Watari, Takanori
Format: Article
Language:English
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Summary:Hollow CeO 2 particles with three types of morphologies (rod, rhombus, and dumbbell) were synthesized by retention of the morphology of Ce(OH)CO 3 precursors during interfacial reactions of Ce(OH)CO 3 with aqueous hydrogen peroxide solution. The wall areas of the hollow CeO 2 particles comprised crystalline CeO 2 nanoparticles. The pH of the aqueous hydrogen peroxide solution played a crucial role in the formation of the hollow structure. The mechanism underlying formation of the hollow structure was also evaluated. The hollow structures of the CeO 2 particles with rod-shaped morphology were maintained even after calcination at 1000 °C, although the structures collapsed after calcination at 1250 °C. Similar reactions using CePO 4 nanorods and plate-shaped Ce 2 (CO 3 ) 3 ·8H 2 O particles instead of Ce(OH)CO 3 particles demonstrated that the plate-shaped Ce 2 (CO 3 ) 3 ·8H 2 O particles could be transformed into plate-shaped CeO 2 particles, although the CePO 4 nanorods were non-reactive. CeO 2 rattle particles composed of CeO 2 porous wall and dense CeO 2 rod were also synthesized. Furthermore, by utilizing the excellent thermal stability of the hollow CeO 2 particles with rod-shaped morphology, hollow Er 3+ -Yb 3+ codoped CeO 2 rods that display upconversion luminescence were synthesized by hydrogen peroxide treatment and subsequent calcination of Er 3+ -Yb 3+ codoped Ce(OH)CO 3 rods at 1000 °C. Hollow CeO 2 particles with three types of morphologies and hollow Er 3+ -Yb 3+ codoped CeO 2 particles that display upconversion luminescence were synthesized.
ISSN:1466-8033
DOI:10.1039/c6ce01550f