Preparation of anatase/rutile TiO2/SnO2 hollow heterostructures for gas sensor

TiO 2 hollow hierarchical architectures with anatase and rutile phases are fabricated. The hierarchical structure uniformly decorated with SnO 2 nanoparticles endows a fascinating sensing performance for detecting triethylamine (TEA). Hierarchical structure provides a close connection between anatase/rutile TiO 2 and SnO 2 , which is in favor of efficient electrons transfer . It is found that TiO 2 @SnO 2 as a novel sensing material has high response at low level of TEA and rapid responding speed in comparison with individual TiO 2 components. In the case of 5 ppm TEA gas under the operation temperature of 240 °C, the response value of TiO 2 @SnO 2 sample is up to 21.6, which is three times higher than that of TiO 2 sample. The responding speed of TiO 2 @SnO 2 sensors elevates 28% in comparison with TiO 2 . This result is utilizable for developing the high efficiency gas sensors using hollow hierarchical architecture.