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We describe the general synthesis of submicrometer-thick rare-earth/lanthanide sesquioxide (RE2O3) films with tailorable pore and grain sizes via polymer templating of hydrated chloride salt precursors. Mesostructured RE2O3 (RE = Sm, Tb–Lu) ceramics with cubic pore symmetry and high surface area (SBET ≥ 50 m2 g–1) were prepared using different diblock copolymer structure-directing agents and were characterized by a combination of electron microscopy, in situ and ex situ grazing incidence small-angle X-ray scattering, N2 physisorption, X-ray photoelectron spectroscopy, X-ray diffraction including Rietveld refinement, and ultraviolet–visible spectroscopy. In the present work, we specifically focus on Dy2O3 and Yb2O3 and use both of these materials as model systems to study, among other things, the film formation and microstructure. Our research data collectively demonstrate that (1) record pore sizes of up to 42 nm in diameter can be achieved without the need for swelling agents, (2) the nanostructure can b...

chemistry of materials

Facile and General Synthesis of Thermally Stable Ordered Mesoporous Rare-Earth Oxide Ceramic Thin Films with Uniform Mid-Size to Large-Size Pores and Strong Crystalline Texture