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Highlights: [•] Synthesis of hollow and hollow core/shell CeO2/SiO2@CeO2 spheres. [•] Structure evolution from hollow core/shell to hollow. [•] Transition of precursor from inner to outer of templates driven by heating. [ABSTRACT FROM AUTHOR]

Abstract: The general synthesis of hollow core-shell ZnCo2O4 spheres through a novel method of solvothermal carbon templating is newly demonstrated. The preparation of hollow core-shell structure involves the key strategy of loading precursor into the mesopores inside the colloidal carbon spheres driven by solvothermal treatment. In addition, the present method is also of high precursor adsorption efficiency owing to the completely conversion of metal source to precursor. It is revealed that the as-prepared products exhibit excellent textural properties of a large surface area and large pore volume. It is assumed that the present method can be extended to prepare a series of hollow core-shell materials for widespread applications. [Copyright &y& Elsevier]

YPO4:Eu3+ hollow microspheres were synthesised by using the spheres of PS/Y(OH)CO3:Eu3+ as a precursor. The whole process mainly consists of the hydrothermal reaction and calcination. The YPO4:Eu3+ hollow spheres were characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence. The formation mechanism was also investigated. The obtained YPO4:Eu3+ hollow spheres may have potential applications in cell biology, drug release and diagnosis, because of high chemical stability and luminescence functionality. [ABSTRACT FROM AUTHOR]

Abstract: YVO4:Eu hollow microspheres have been successfully fabricated via a urea-based homogeneous precipitation method in the presence of colloidal melamine formaldehyde resin (MF) microspheres as templates, without heat treatment. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectra, and the kinetic decay were employed to examine the resulting phase formation, morphology and luminescent properties. The XRD result reveals that the doped sample is of high crystallization which is assigned to the pure tetragonal phase of YVO4. Upon excitation by ultraviolet excitation, the YVO4:Eu sample shows strong red light emission. [Copyright &y& Elsevier]