Abstract

Three-dimensional brush-like ZnO?CTiO₂ hierarchical heterojunctions nanofibers have been successfully obtained by the combination of the electrospinning and hydrothermal process. The FESEM images showed that the brush-like ZnO?CTiO₂ hierarchical heterojunctions nanofibers are composed of uniform ZnO nanorods layer of approximately 100?C300 nm in diameter grown on the side surface of TiO₂ core nanofibers. The gas sensing studies revealed that the ZnO?CTiO₂ sensors exhibited enhanced sensing performance to ethanol compared with the pristine TiO₂ nanofibers and pristine ZnO nanorods, which might be attributed to the unique hierarchical structure and great degree of electron depletion of the interface based on the synergistic effect among the two components of TiO₂ and ZnO.