Conceptually novel Nb-doped TiO2@Nb2O5 core–shell heterostructures were obtained by one-step hydrothermal synthesis through sequential growth of Nb-doped TiO2 core and Nb2O5 shell structures.
Urchin-like cobalt oxide (Co3O4) hollow spheres can be successfully prepared by thermal decomposition of cobalt carbonate hydroxide hydrate (Co(CO3)0.5(OH)·0.11H2O) obtained by template-assisted hydrothermal synthesis.