Hierarchical tin oxide（SnO2） architectures were synthesized with a facile hydrothermal method. In the hydrothermal synthesis, sodium dodecyl benzene sulfonate（SDBS） surfactant plays an important role as struc- ture-directing reagent. The synthesized samples were characterized by powder X-ray diffraction（XRD）, field emis- sion scanning electron microscopy（FESEM）, transmission electron microscopy（TEM） and high-resolution transmis- sion electron microscopy（HRTEM）. The results clearly reveal that the hierarchical architectures of SnO2 were com- posed of aggregated nanosheets with a thickness of about 100 nm. A possible mechanism for the formation of the SnO2 hierarchical architectures was proposed. In addition, the gas sensing properties of the as-prepared products were investigated and it was found that the sensor based on the special SnO2 hierarchical architectures exhibited a high re- sponse and good selectivity to NO2 at the optimal working temperature of 160 ℃.
SnO2-ln2O3 hierarchical microspheres were prepared by the hydrothermal and solvothermal method. The morphology, phase crystallinity of the obtained SnO2-In203 were measured by X-ray diffraetion（XRD）, scan electron microscopy（SEM）, respectively. A room temperature ozone sensor based on SnO2-In2O3 hierarchical microspheres was fabricated and investigated. The gas sensing properties of the sensor using SnO2-In2O3 strongly depended on the proportion of SnO2 and In2O3. The sensitivity and response/recovery speed were greatly enhanced by UV illumination. A gas sensing mechanism related to oxygen defect was suggested.
SUN Jian-boXU JingWANG BiaoSUN PengLIU Feng-minLU Ge-yu
